15th United States Congress

The 15th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in the Old Brick Capitol in Washington, D.C. from March 4, 1817, to March 4, 1819, during the first two years of James Monroe's presidency. The apportionment of seats in the House of Representatives was based on the 1810 United States census. Both chambers had a Democratic-Republican majority.

Letter of December 1818
Two major treaties with the United Kingdom were approved, finalized and signed during the 15th Congress, both the Rush–Bagot Treaty and the Treaty of 1818, both of which pertained to the United States-Canada border, and both of which were overwhelmingly popular in the United States. President James Monroe and Secretary of State John Quincy Adams were credited with the accomplishments. A letter signed by many members of congress expressing "Gratitude, amity and brotherhood with Great Britain" was addressed to British Prime Minister Robert Jenkinson, 2nd Earl of Liverpool, British Secretary of State for War and the Colonies Henry Bathurst, 3rd Earl Bathurst, British foreign secretary Robert Stewart, Viscount Castlereagh and Britain's minister plenipotentiary and envoy extraordinaire to the United States Charles Bagot. The letter also attacked King Louis XVIII of France for insulting remarks he had made towards American diplomats and about the United States, as well as his refusal to pay reparations owed to the United States from damages incurred during the Quasi-War. The letter was signed in December 1818 by Joel Abbot, Thomas W. Cobb, Zadock Cook, Joel Crawford, John Forsyth, William Terrell, Charles Tait, William Smith, John Gaillard, Henry Middleton, William Lowndes, James Ervin, Joseph Bellinger, Starling Tucker, Eldred Simkins, Elias Earle, Wilson Nesbitt, Stephen Decatur Miller, Montfort Stokes, Nathaniel Macon, Lemuel Sawyer, Joseph Hunter Bryan, Thomas H. Hall, Jesse Slocumb, James Owen, Weldon Nathaniel Edwards, James Stewart, James Strudwick Smith, Thomas Settle, George Mumford, Daniel Munroe Forney, Felix Walker, Lewis Williams, John J. Crittenden, Isham Talbot, David Trimble, Henry Clay, Richard Mentor Johnson, Joseph Desha, Anthony New, David Walker, George Robertson, Richard Clough Anderson Jr., Tunstall Quarles, Thomas Speed, William Hendricks, James Noble, Waller Taylor, John Eaton, John Williams, John Rhea, William Grainger Blount, Francis Jones, Samuel E. Hogg, Thomas Claiborne, George W.L. Marr, George Poindexter, Prentiss Mellen, Harrison Gray Otis, Enoch Lincoln, Jonathan Mason, Nathaniel Silsbee, Jeremiah Nelson, Timothy Fuller, Elijah H. Mills, Samuel Clesson Allen, Henry Shaw, Zabdiel Sampson, Walter Folger Jr., Marcus Morton, Benjamin Adams, Solomon Strong, Nathaniel Ruggles, John Holmes, Ezekiel Whitman, Benjamin Orr, John Wilson, Thomas Rice, Joshua Gage and Albion Parris, all of whom also voted to ratify both of the aforementioned treaties. Several governors also signed the letter, which was entirely symbolic and intended as a gesture of goodwill, including Gabriel Slaughter, William Rabun, John Geddes, John Branch, John Brooks, James Patton Preston and David Holmes. This was significant because the governors and the members of congress were from different regions (both Massachusetts and several southern states were represented), and because signers came from both the Whig Party and the Democratic-Republicans. Many members of congress and Washington DC had a very hostile relationship with France's notoriously combative ambassador Jean-Guillaume, baron Hyde de Neuville, which contributed to the letters contents as per France.

Major events

 * March 4, 1817: James Monroe became President of the United States
 * July 4, 1817: Construction on the Erie Canal began
 * November 20, 1817: The first Seminole War began in Florida
 * January 2, 1819: The Panic of 1819, the first major financial crisis in the United States, began.
 * February 2, 1819: Dartmouth College v. Woodward: Supreme Court allowed Dartmouth to keep its charter and remain a private institution.

Major legislation

 * April 4, 1818: Flag Act of 1818, Sess. 1, ch. 34,

Treaties

 * April 29, 1817: Rush–Bagot Treaty signed between the U.S. and the United Kingdom
 * October 20, 1818: Treaty of 1818 between the U.S. and the United Kingdom established the northern boundary as the 49th parallel from the Lake of the Woods to the Rocky Mountains, also creating the Northwest Angle.
 * February 22, 1819: Adams-Onís Treaty: Spain ceded Florida to the United States

States admitted and territories created

 * December 10, 1817: Mississippi admitted as the 20th state
 * December 3, 1818: Illinois admitted as the 21st state
 * March 2, 1819: Arkansas Territory was created, ; it was formerly part of the Missouri Territory

Party summary
The count below identifies party affiliations at the beginning of the first session of this congress. Changes resulting from subsequent replacements are shown below in the "Changes in membership" section.

Senate
During this congress, two Senate seats were added for each of the new states of Mississippi and Illinois.

House of Representatives
During this congress, one House seat was added for each of the new states of Mississippi and Illinois.

Senate

 * President: Daniel D. Tompkins (DR)
 * President pro tempore:
 * John Gaillard (DR), elected March 4, 1817
 * James Barbour (DR), elected February 15, 1819

House of Representatives

 * Speaker: Henry Clay (DR)

Members
This list is arranged by chamber, then by state. Senators are listed by class and representatives are listed by district.


 * Skip to House of Representatives, below

Senate
Senators were elected by the state legislatures every two years, with one-third beginning new six-year terms with each Congress. Preceding the names in the list below are Senate class numbers, which indicate the cycle of their election. In this Congress, Class 1 meant their term began in the last Congress, requiring re-election in 1820; Class 2 meant their term began with this Congress, requiring re-election in 1822; and Class 3 meant their term ended with this Congress, requiring re-election in 1818.

Connecticut

 * 1. Samuel W. Dana (F)
 * 3. David Daggett (F)

Delaware

 * 1. Outerbridge Horsey (F)
 * 2. Nicholas Van Dyke (F)

Georgia

 * 2. George Troup (DR), until September 23, 1818
 * John Forsyth (DR), November 23, 1818 – February 17, 1819
 * 3. Charles Tait (DR)

Illinois

 * 2. Jesse B. Thomas (DR), from December 3, 1818 (newly admitted state)
 * 3. Ninian Edwards (DR), from December 3, 1818 (newly admitted state)

Indiana

 * 1. James Noble (DR)
 * 3. Waller Taylor (DR)

Kentucky

 * 2. John J. Crittenden (DR), until March 3, 1819
 * 3. Isham Talbot (DR)

Louisiana

 * 2. William C. C. Claiborne (DR), died November 23, 1817
 * Henry Johnson (DR), from January 12, 1818
 * 3. Eligius Fromentin (DR)

Maryland

 * 1. Alexander C. Hanson (F)
 * 3. Robert H. Goldsborough (F)

Massachusetts

 * 1. Eli P. Ashmun (F), until May 10, 1818
 * Prentiss Mellen (F), from June 5, 1818
 * 2. Harrison Gray Otis (F)

Mississippi

 * 1. Walter Leake (DR), from December 10, 1817 (newly admitted state)
 * 2. Thomas H. Williams (DR), from December 10, 1817 (newly admitted state)

New Hampshire

 * 2. David L. Morril (DR)
 * 3. Jeremiah Mason (F), until June 16, 1817
 * Clement Storer (DR), from June 27, 1817

New Jersey

 * 1. James J. Wilson (DR)
 * 2. Mahlon Dickerson (DR)

New York

 * 1. Nathan Sanford (DR)
 * 3. Rufus King (F)

North Carolina

 * 2. Montfort Stokes (DR)
 * 3. Nathaniel Macon (DR)

Ohio

 * 1. Benjamin Ruggles (DR)
 * 3. Jeremiah Morrow (DR)

Pennsylvania

 * 1. Jonathan Roberts (DR)
 * 3. Abner Lacock (DR)

Rhode Island

 * 1. William Hunter (F)
 * 2. James Burrill Jr. (F)

South Carolina

 * 2. William Smith (DR)
 * 3. John Gaillard (DR)

Tennessee

 * 1. George W. Campbell (DR), until April 20, 1818
 * John H. Eaton (DR), from September 5, 1818
 * 2. John Williams (DR)

Vermont

 * 1. Isaac Tichenor (F)
 * 3. Dudley Chase (DR), until November 3, 1817
 * James Fisk (DR), November 4, 1817 – January 8, 1818
 * William A. Palmer (DR), from October 20, 1818

Virginia

 * 1. James Barbour (DR)
 * 2. John W. Eppes (DR)



House of Representatives
The names of members of the House of Representatives are preceded by their district numbers.

Connecticut
All representatives were elected statewide on a general ticket.
 * Connecticut's at-large congressional district. Uriel Holmes (F), until 1818
 * Sylvester Gilbert (DR), from November 16, 1818
 * Connecticut's at-large congressional district. Ebenezer Huntington (F)
 * Connecticut's at-large congressional district. Jonathan O. Moseley (F)
 * Connecticut's at-large congressional district. Timothy Pitkin (F)
 * Connecticut's at-large congressional district. Samuel B. Sherwood (F)
 * Connecticut's at-large congressional district. Nathaniel Terry (F)
 * Connecticut's at-large congressional district. Thomas S. Williams (F)

Delaware
Both representatives were elected statewide on a general ticket.
 * Delaware's at-large congressional district. Willard Hall (DR)
 * Delaware's at-large congressional district. Louis McLane (F)

Georgia
All representatives were elected statewide on a general ticket.
 * Georgia's at-large congressional district. Joel Abbot (DR)
 * Georgia's at-large congressional district. Thomas W. Cobb (DR)
 * Georgia's at-large congressional district. Zadock Cook (DR)
 * Georgia's at-large congressional district. Joel Crawford (DR)
 * Georgia's at-large congressional district. John Forsyth (DR), until November 23, 1818
 * Robert R. Reid (DR), from February 18, 1819
 * Georgia's at-large congressional district. William Terrell (DR)

Illinois

 * Illinois's at-large congressional district. John McLean (DR), from December 3, 1818 (newly admitted state)

Indiana

 * Indiana's at-large congressional district. William Hendricks (DR)

Kentucky

 * Kentucky's 1st congressional district. David Trimble (DR)
 * Kentucky's 2nd congressional district. Henry Clay (DR)
 * Kentucky's 3rd congressional district. Richard M. Johnson (DR)
 * Kentucky's 4th congressional district. Joseph Desha (DR)
 * Kentucky's 5th congressional district. Anthony New (DR)
 * Kentucky's 6th congressional district. David Walker (DR)
 * Kentucky's 7th congressional district. George Robertson (DR)
 * Kentucky's 8th congressional district. Richard C. Anderson Jr. (DR)
 * Kentucky's 9th congressional district. Tunstal Quarles (DR)
 * Kentucky's 10th congressional district. Thomas Speed (DR)

Louisiana

 * Louisiana's at-large congressional district. Thomas B. Robertson (DR), until April 20, 1818
 * Thomas Butler (DR), from November 16, 1818

Maryland
The 5th district was a plural district with two representatives.
 * Maryland's 1st congressional district. Philip Stuart (F)
 * Maryland's 2nd congressional district. John C. Herbert (F)
 * Maryland's 3rd congressional district. George Peter (F)
 * Maryland's 4th congressional district. Samuel Ringgold (DR)
 * Maryland's 5th congressional district. Peter Little (DR)
 * Maryland's 5th congressional district. Samuel Smith (DR)
 * Maryland's 6th congressional district. Philip Reed (DR)
 * Maryland's 7th congressional district. Thomas Culbreth (DR)
 * Maryland's 8th congressional district. Thomas Bayly (F)

Massachusetts

 * Massachusetts's 1st congressional district. Jonathan Mason (F)
 * Massachusetts's 2nd congressional district. Nathaniel Silsbee (DR)
 * Massachusetts's 3rd congressional district. Jeremiah Nelson (F)
 * Massachusetts's 4th congressional district. Timothy Fuller (DR)
 * Massachusetts's 5th congressional district. Elijah H. Mills (F)
 * Massachusetts's 6th congressional district. Samuel C. Allen (F)
 * Massachusetts's 7th congressional district. Henry Shaw (DR)
 * Massachusetts's 8th congressional district. Zabdiel Sampson (DR)
 * Massachusetts's 9th congressional district. Walter Folger Jr. (DR)
 * Massachusetts's 10th congressional district. Marcus Morton (DR)
 * Massachusetts's 11th congressional district. Benjamin Adams (F)
 * Massachusetts's 12th congressional district. Solomon Strong (F)
 * Massachusetts's 13th congressional district. Nathaniel Ruggles (F)
 * Massachusetts's 14th congressional district. John Holmes (DR)
 * Massachusetts's 15th congressional district. Ezekiel Whitman (F)
 * Massachusetts's 16th congressional district. Benjamin Orr (F)
 * Massachusetts's 17th congressional district. John Wilson (F)
 * Massachusetts's 18th congressional district. Thomas Rice (F)
 * Massachusetts's 19th congressional district. Joshua Gage (DR)
 * Massachusetts's 20th congressional district. Albion K. Parris (DR), until February 3, 1818
 * Enoch Lincoln (DR), from November 4, 1818

Mississippi

 * Mississippi's at-large congressional district. George Poindexter (DR), from December 10, 1817

New Hampshire
All representatives were elected statewide on a general ticket.
 * New Hampshire's at-large congressional district. Josiah Butler (DR)
 * New Hampshire's at-large congressional district. Clifton Clagett (DR)
 * New Hampshire's at-large congressional district. Salma Hale (DR)
 * New Hampshire's at-large congressional district. Arthur Livermore (DR)
 * New Hampshire's at-large congressional district. John F. Parrott (DR)
 * New Hampshire's at-large congressional district. Nathaniel Upham (DR)

New Jersey
All representatives were elected statewide on a general ticket.
 * New Jersey's at-large congressional district. Ephraim Bateman (DR)
 * New Jersey's at-large congressional district. Benjamin Bennet (DR)
 * New Jersey's at-large congressional district. Joseph Bloomfield (DR)
 * New Jersey's at-large congressional district. Charles Kinsey (DR)
 * New Jersey's at-large congressional district. John Linn (DR)
 * New Jersey's at-large congressional district. Henry Southard (DR)

New York
There were six plural districts, the 1st, 2nd, 12th, 15th, 20th & 21st, each had two representatives.
 * New York's 1st congressional district. Tredwell Scudder (DR)
 * New York's 1st congressional district. George Townsend (DR)
 * New York's 2nd congressional district. William Irving (DR)
 * New York's 2nd congressional district. Peter H. Wendover (DR)
 * New York's 3rd congressional district. Caleb Tompkins (DR)
 * New York's 4th congressional district. James Tallmadge Jr. (DR), from December 1, 1817
 * New York's 5th congressional district. Philip J. Schuyler (F)
 * New York's 6th congressional district. James W. Wilkin (DR)
 * New York's 7th congressional district. Josiah Hasbrouck (DR)
 * New York's 8th congressional district. Dorrance Kirtland (DR)
 * New York's 9th congressional district. Rensselaer Westerlo (F)
 * New York's 10th congressional district. John P. Cushman (F)
 * New York's 11th congressional district. John W. Taylor (DR)
 * New York's 12th congressional district. John Palmer (DR)
 * New York's 12th congressional district. John Savage (DR)
 * New York's 13th congressional district. Thomas Lawyer (DR)
 * New York's 14th congressional district. John Herkimer (DR)
 * New York's 15th congressional district. John R. Drake (DR)
 * New York's 15th congressional district. Isaac Williams Jr. (DR)
 * New York's 16th congressional district. Henry R. Storrs (F)
 * New York's 17th congressional district. Thomas H. Hubbard (DR)
 * New York's 18th congressional district. David A. Ogden (F)
 * New York's 19th congressional district. James Porter (DR)
 * New York's 20th congressional district. Oliver C. Comstock (DR)
 * New York's 20th congressional district. Daniel Cruger (DR)
 * New York's 21st congressional district. Benjamin Ellicott (DR)
 * New York's 21st congressional district. John C. Spencer (DR)

North Carolina

 * North Carolina's 1st congressional district. Lemuel Sawyer (DR)
 * North Carolina's 2nd congressional district. Joseph H. Bryan (DR)
 * North Carolina's 3rd congressional district. Thomas H. Hall (DR)
 * North Carolina's 4th congressional district. Jesse Slocumb (F)
 * North Carolina's 5th congressional district. James Owen (DR)
 * North Carolina's 6th congressional district. Weldon N. Edwards (DR)
 * North Carolina's 7th congressional district.James Stewart (F), from January 5, 1818
 * North Carolina's 8th congressional district. James S. Smith (DR)
 * North Carolina's 9th congressional district. Thomas Settle (DR)
 * North Carolina's 10th congressional district. George Mumford (DR), until December 31, 1818
 * Charles Fisher (DR), from February 11, 1819
 * North Carolina's 11th congressional district. Daniel M. Forney (DR), until 1818
 * William Davidson (F), from December 2, 1818
 * North Carolina's 12th congressional district. Felix Walker (DR)
 * North Carolina's 13th congressional district. Lewis Williams (DR)

Ohio

 * Ohio's 1st congressional district. William Henry Harrison (DR)
 * Ohio's 2nd congressional district. John W. Campbell (DR)
 * Ohio's 3rd congressional district. Levi Barber (DR)
 * Ohio's 4th congressional district. Samuel Herrick (DR)
 * Ohio's 5th congressional district. Philemon Beecher (F)
 * Ohio's 6th congressional district. Peter Hitchcock (DR)

Pennsylvania
There were six plural districts, the 2nd, 3rd, 5th, 6th & 10th had two representatives each, the 1st had four representatives.
 * Pennsylvania's 1st congressional district. William Anderson (DR)
 * Pennsylvania's 1st congressional district. Joseph Hopkinson (F)
 * Pennsylvania's 1st congressional district. John Sergeant (F)
 * Pennsylvania's 1st congressional district. Adam Seybert (DR)
 * Pennsylvania's 2nd congressional district. Isaac Darlington (F)
 * Pennsylvania's 2nd congressional district. Levi Pawling (F)
 * Pennsylvania's 3rd congressional district. James M. Wallace (DR)
 * Pennsylvania's 3rd congressional district. John Whiteside (DR)
 * Pennsylvania's 4th congressional district. Jacob Spangler (DR), until April 20, 1818
 * Jacob Hostetter (DR), from November 16, 1818
 * Pennsylvania's 5th congressional district. Andrew Boden (DR)
 * Pennsylvania's 5th congressional district. William Maclay (DR)
 * Pennsylvania's 6th congressional district. Samuel D. Ingham (DR), until July 6, 1818
 * Samuel Moore (DR), from October 13, 1818
 * Pennsylvania's 6th congressional district. John Ross (DR), until February 24, 1818
 * Thomas J. Rogers (DR), from March 3, 1818
 * Pennsylvania's 7th congressional district. Joseph Hiester (DR)
 * Pennsylvania's 8th congressional district. Alexander Ogle (DR)
 * Pennsylvania's 9th congressional district. William P. Maclay (DR)
 * Pennsylvania's 10th congressional district. John Murray (DR), from October 14, 1817
 * Pennsylvania's 10th congressional district. William Wilson (DR)
 * Pennsylvania's 11th congressional district. David Marchand (DR)
 * Pennsylvania's 12th congressional district. Thomas Patterson (DR)
 * Pennsylvania's 13th congressional district. Christian Tarr (DR)
 * Pennsylvania's 14th congressional district. Henry Baldwin (DR)
 * Pennsylvania's 15th congressional district. Robert Moore (DR)

Rhode Island
Both representatives were elected statewide on a general ticket.
 * Rhode Island's at-large congressional district. John L. Boss Jr. (F)
 * Rhode Island's at-large congressional district. James B. Mason (F)

South Carolina

 * South Carolina's 1st congressional district. Henry Middleton (DR)
 * South Carolina's 2nd congressional district. William Lowndes (DR)
 * South Carolina's 3rd congressional district. James Ervin (DR)
 * South Carolina's 4th congressional district. Joseph Bellinger (DR)
 * South Carolina's 5th congressional district. Starling Tucker (DR)
 * South Carolina's 6th congressional district. John C. Calhoun (DR), until November 3, 1817
 * Eldred Simkins (DR), from January 24, 1818
 * South Carolina's 7th congressional district. Elias Earle (DR)
 * South Carolina's 8th congressional district. Wilson Nesbitt (DR)
 * South Carolina's 9th congressional district. Stephen D. Miller (DR)

Tennessee

 * Tennessee's 1st congressional district. John Rhea (DR)
 * Tennessee's 2nd congressional district. William G. Blount (DR)
 * Tennessee's 3rd congressional district. Francis Jones (DR)
 * Tennessee's 4th congressional district. Samuel Hogg (DR)
 * Tennessee's 5th congressional district. Thomas Claiborne (DR)
 * Tennessee's 6th congressional district. George W. L. Marr (DR)

Vermont
All representatives were elected statewide on a general ticket.
 * Vermont's at-large congressional district. Heman Allen (DR), until April 20, 1818; vacant thereafter
 * Vermont's at-large congressional district. Samuel C. Crafts (DR)
 * Vermont's at-large congressional district. William Hunter (DR)
 * Vermont's at-large congressional district. Orsamus C. Merrill (DR)
 * Vermont's at-large congressional district. Charles Rich (DR)
 * Vermont's at-large congressional district. Mark Richards (DR)

Virginia

 * Virginia's 1st congressional district. James Pindall (F)
 * Virginia's 2nd congressional district. Edward Colston (F)
 * Virginia's 3rd congressional district. Henry St. George Tucker (DR)
 * Virginia's 4th congressional district. William McCoy (DR)
 * Virginia's 5th congressional district. John Floyd (DR)
 * Virginia's 6th congressional district. Alexander Smyth (DR)
 * Virginia's 7th congressional district. Ballard Smith (DR)
 * Virginia's 8th congressional district. Charles F. Mercer (F)
 * Virginia's 9th congressional district. William Lee Ball (DR)
 * Virginia's 10th congressional district. George F. Strother (DR)
 * Virginia's 11th congressional district. Philip P. Barbour (DR)
 * Virginia's 12th congressional district. Robert S. Garnett (DR)
 * Virginia's 13th congressional district. Burwell Bassett (DR)
 * Virginia's 14th congressional district. William A. Burwell (DR)
 * Virginia's 15th congressional district. William J. Lewis (DR)
 * Virginia's 16th congressional district. Archibald Austin (DR)
 * Virginia's 17th congressional district. James Pleasants (DR)
 * Virginia's 18th congressional district. Thomas M. Nelson (DR)
 * Virginia's 19th congressional district. Peterson Goodwyn (DR), until February 21, 1818
 * John Pegram (DR), from April 21, 1818
 * Virginia's 20th congressional district. James Johnson (DR)
 * Virginia's 21st congressional district. Thomas Newton Jr. (DR)
 * Virginia's 22nd congressional district. Hugh Nelson (DR)
 * Virginia's 23rd congressional district. John Tyler (DR)

Non-voting members

 * Alabama Territory's at-large congressional district. John Crowell, from January 29, 1818
 * Illinois Territory's at-large congressional district. Nathaniel Pope, until November 30, 1818, vacant thereafter
 * Mississippi Territory's at-large congressional district. Vacant until statehood December 10, 1817
 * Missouri Territory's at-large congressional district. John Scott, from August 4, 1817

Changes in membership
The count below reflects changes from the beginning of the first session of this Congress.

Senate

 * New Hampshire (3)
 * | Jeremiah Mason (F)
 * style="font-size:80%" | Resigned June 16, 1817
 * | Clement Storer (DR)
 * Seated June 27, 1817
 * Vermont (3)
 * | Dudley Chase (DR)
 * style="font-size:80%" | Resigned November 3, 1817, to become Chief Justice of the Vermont Supreme Court
 * | James Fisk (DR)
 * Seated November 4, 1817
 * Louisiana (2)
 * | William C. C. Claiborne (DR)
 * style="font-size:80%" | Died November 23, 1817
 * | Henry Johnson (DR)
 * Seated January 12, 1818
 * Mississippi (1)
 * rowspan=2 | New seats
 * rowspan=2 style="font-size:80%" | Mississippi was admitted to the Union on December 10, 1817
 * | Walter Leake (DR)
 * rowspan=2 | Installed December 10, 1817
 * Mississippi (2)
 * | Thomas H. Williams (DR)
 * Vermont (3)
 * | James Fisk (DR)
 * style="font-size:80%" | Resigned January 8, 1818, to become Vermont Collector of Customs. Winner elected October 20, 1818.
 * | William A. Palmer (DR)
 * Seated October 20, 1818
 * Tennessee (1)
 * | George W. Campbell (DR)
 * style="font-size:80%" | Resigned April 20, 1818, to become Ambassador to Russia
 * | John Eaton (DR)
 * Seated September 5, 1818
 * Massachusetts (1)
 * | Eli P. Ashmun (F)
 * style="font-size:80%" | Resigned May 10, 1818. Winner elected June 5, 1818.
 * | Prentiss Mellen (F)
 * Seated June 5, 1818
 * Georgia (2)
 * | George Troup (DR)
 * style="font-size:80%" | Resigned September 23, 1818, to run for Governor of Georgia. Winner elected September 23, 1818.
 * | John Forsyth (DR)
 * Seated November 23, 1818
 * Illinois (2)
 * rowspan=2 | New seats
 * rowspan=2 style="font-size:80%" | Illinois was admitted to the Union on December 3, 1818.
 * | Jesse B. Thomas (DR)
 * rowspan=2 | Installed December 3, 1818
 * Illinois (3)
 * | Ninian Edwards (DR)
 * Georgia (2)
 * | John Forsyth (DR)
 * style="font-size:80%" | Resigned February 17, 1819, to become U.S. Minister to Spain. Winner was elected in the next Congress.
 * colspan=2 rowspan=2 | Not filled until next Congress
 * Kentucky (2)
 * | John J. Crittenden (DR)
 * style="font-size:80%" | Resigned March 3, 1819, to return to private practice. Winner was elected in the next Congress.
 * }
 * Illinois (3)
 * | Ninian Edwards (DR)
 * Georgia (2)
 * | John Forsyth (DR)
 * style="font-size:80%" | Resigned February 17, 1819, to become U.S. Minister to Spain. Winner was elected in the next Congress.
 * colspan=2 rowspan=2 | Not filled until next Congress
 * Kentucky (2)
 * | John J. Crittenden (DR)
 * style="font-size:80%" | Resigned March 3, 1819, to return to private practice. Winner was elected in the next Congress.
 * }
 * | John J. Crittenden (DR)
 * style="font-size:80%" | Resigned March 3, 1819, to return to private practice. Winner was elected in the next Congress.
 * }

House of Representatives

 * nowrap | New York's 4th congressional district
 * Vacant
 * Member-elect Henry B. Lee died before this Congress began
 * | James Tallmadge Jr. (DR)
 * Seated June 6, 1817
 * Seated June 6, 1817


 * Missouri Territory At-large
 * Vacant
 * Seat remained vacant from March 4, 1817, to August 4, 1817
 * John Scott
 * Seated August 4, 1817
 * Seated August 4, 1817


 * Pennsylvania's 10th congressional district
 * Vacant
 * Member-elect David Scott resigned before this Congress began
 * | John Murray (DR)
 * Seated October 14, 1817
 * Seated October 14, 1817


 * North Carolina's 7th congressional district
 * Vacant
 * Member-elect Alexander McMillan died before this Congress began
 * | James Stewart (F)
 * Seated January 5, 1818
 * Seated January 5, 1818


 * South Carolina's 6th congressional district
 * | John C. Calhoun (DR)
 * Resigned November 3, 1817, after being appointed United States Secretary of War
 * | Eldred Simkins (DR)
 * Seated January 24, 1818
 * Seated January 24, 1818


 * Mississippi Territory At-large
 * rowspan=2 | Vacant
 * rowspan=2 | Seat remained vacant until Mississippi was admitted to the Union December 10, 1817
 * rowspan=2 | George Poindexter (DR)
 * rowspan=2 | Seated December 10, 1817
 * rowspan=2 | Seated December 10, 1817


 * Mississippi At-large
 * Mississippi At-large


 * Connecticut At-large
 * | Uriel Holmes (F)
 * Resigned sometime in 1818
 * | Sylvester Gilbert (DR)
 * Seated November 16, 1818
 * Seated November 16, 1818


 * North Carolina's 11th congressional district
 * | Daniel Forney (DR)
 * Resigned sometime in 1818
 * | William Davidson (F)
 * Seated December 2, 1818
 * Seated December 2, 1818


 * Alabama Territory At-large
 * Vacant
 * The first delegate from this new territory was not seated until January 29, 1818.
 * John Crowell
 * Seated January 29, 1818
 * Seated January 29, 1818


 * Massachusetts's 20th congressional district
 * | Albion K. Parris (DR
 * Resigned February 3, 1818
 * | Enoch Lincoln (DR)
 * Seated November 4, 1818
 * Seated November 4, 1818


 * Virginia's 19th congressional district
 * | Peterson Goodwyn (DR)
 * Died February 21, 1818
 * | John Pegram (DR)
 * Seated April 21, 1818
 * Seated April 21, 1818


 * Pennsylvania's 6th congressional district
 * | John Ross (DR)
 * Resigned February 24, 1818, to become President Judge of Pennsylvania's 7th Judicial Circuit
 * | Thomas J. Rogers (DR)
 * Seated March 3, 1818
 * Seated March 3, 1818


 * Louisiana At-large
 * | Thomas B. Robertson (DR)
 * Resigned April 20, 1818
 * | Thomas Butler (DR)
 * Seated November 16, 1818
 * Seated November 16, 1818


 * Pennsylvania's 4th congressional district
 * | Jacob Spangler (DR)
 * Resigned April 20, 1818
 * | Jacob Hostetter (DR)
 * Seated November 16, 1818
 * Seated November 16, 1818


 * Pennsylvania's 6th congressional district
 * | Samuel D. Ingham (DR)
 * Resigned July 6, 1818
 * | Samuel Moore (DR)
 * Seated October 13, 1818
 * Seated October 13, 1818


 * Georgia At-large
 * | John Forsyth (DR)
 * Resigned November 23, 1818, after being elected to the U.S. Senate
 * | Robert R. Reid (DR)
 * Seated February 18, 1819
 * Seated February 18, 1819


 * Illinois Territory At-large
 * rowspan=2 | Nathaniel Pope
 * rowspan=2 | Pope's term ended November 30, 1818, and the seat remained vacant until Illinois was admitted to the Union December 3, 1818
 * rowspan=2 | John McLean (DR)
 * rowspan=2 | Seated December 3, 1818
 * rowspan=2 | Seated December 3, 1818


 * Illinois At-large
 * Illinois At-large


 * North Carolina's 10th congressional district
 * | George Mumford (DR)
 * Died December 31, 1818
 * | Charles Fisher (DR)
 * Seated February 11, 1819
 * Seated February 11, 1819


 * Vermont At-large
 * | Heman Allen (DR)
 * resigned April 20, 1818
 * Vacant
 * Vacant


 * }

Committees
Lists of committees and their party leaders.

Senate

 * Audit and Control the Contingent Expenses of the Senate (Chairman: Abner Lacock)
 * Claims (Chairman: Jonathan Roberts then Robert Henry Goldsborough)
 * Commerce and Manufactures (Chairman: Nathan Sanford)
 * District of Columbia (Chairman: Robert Henry Goldsborough)
 * Engrossed Bills (Chairman: John J. Crittenden)
 * Finance (Chairman: George W. Campbell then John Wayles Eppes)
 * Foreign Relations (Chairman: James Barbour then Nathaniel Macon)
 * Indian Title to Certain Lands (Select)
 * Judiciary (Chairman: John J. Crittenden then James Burrill Jr.)
 * Military Affairs (Chairman: George M. Troup then John Williams)
 * Militia (Chairman: Clement Storer then Benjamin Ruggles)
 * Mississippi's Admission to the Union (Select)
 * Naval Affairs (Chairman: Charles Tait then Nathan Sanford)
 * Pensions (Chairman: James Noble then Abner Lacock)
 * Post Office and Post Roads (Chairman: James J. Wilson then Montfort Stokes)
 * Public Lands (Chairman: Jeremiah Morrow)
 * Seminole War (Select)
 * Slave Trade (Select)
 * Whole

House of Representatives

 * Accounts (Chairman: Peter Little)
 * Alabama's Admission to the Union (Select)
 * Arkansas Territory (Select)
 * Bank of the United States (Select)
 * Claims (Chairman: Lewis Williams)
 * Commerce and Manufactures (Chairman: Thomas Newton Jr.)
 * District of Columbia (Chairman: John C. Herbert)
 * Elections (Chairman: John W. Taylor)
 * Expenditures in the Navy Department (Chairman: James Pleasants)
 * Expenditures in the Post Office Department (Chairman: Samuel D. Ingham)
 * Expenditures in the State Department (Chairman: John Forsyth)
 * Expenditures in the Treasury Department (Chairman: William Lowndes)
 * Expenditures in the War Department (Chairman: Richard M. Johnson)
 * Expenditures on Public Buildings (Chairman: Henry S. Tucker)
 * Judiciary (Chairman: Hugh Nelson)
 * Pensions and Revolutionary War Claims (Chairman: John Rhea)
 * Private Land Claims (Chairman: Samuel Herrick then George Robertson)
 * Post Office and Post Roads (Chairman: Samuel D. Ingham then Arthur Livermore)
 * Public Expenditures (Chairman: Joseph Desha)
 * Public Lands (Chairman: Thomas B. Robertson then George Poindexter)
 * Revisal and Unfinished Business (Chairman: John Savage then John W. Taylor)
 * Rules (Select)
 * Standards of Official Conduct
 * Ways and Means (Chairman: William Lowndes then Samuel Smith)
 * Whole

Joint committees

 * Enrolled Bills
 * The Library (Chairman: N/A)

Legislative branch agency directors

 * Architect of the Capitol: Benjamin H. Latrobe, resigned November 20, 1817
 * Charles Bulfinch, appointed January 8, 1818
 * Librarian of Congress: George Watterston

Senate

 * Chaplain: Sereno Edwards Dwight, Congregationalist, until December 9, 1817
 * William D. Hawley, Episcopalian, elected December 9, 1817
 * John Clark, Presbyterian, elected November 19, 1818
 * Secretary: Charles Cutts
 * Sergeant at Arms: Mountjoy Bayly

House of Representatives

 * Chaplain: Burgiss Allison (Baptist)
 * Clerk: Thomas Dougherty
 * Doorkeeper: Thomas Claxton
 * Reading Clerks:
 * Sergeant at Arms: Thomas Dunn