49th Illinois General Assembly

The 49th Illinois General Assembly met from 1915 to 1917. The first session convened on January 6, 1915 and adjourned sine die on June 30, 1915. The first special session convened on November 22, 1915 and adjourned sine die on May 10, 1916. The second special session convened on January 11, 1916 and adjourned sine die on February 14, 1916.

Barratt O'Hara of Chicago was the Lieutenant Governor of Illinois and thus ex officio President of the Senate. Stephen D. Canady of Hillsboro was President pro tempore of the Senate. David Shanahan of Chicago was the Speaker of the House of Representatives. Shanahan was made Temporary Speaker on February 16 after 68 ballots and was made full Speaker on February 17 on the first ballot. In the first session 1,548 bills were introduced, of which 293 became law.

Districts
Illinois was divided into 51 districts, each of which elected one Senator and three Representatives. Districts were last reapportioned in 1901 and would not be reapportioned again until 1947.

The counties of each district were as follows:
 * 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, 23rd, 25th, 27th, 29th, and 31st: Parts of Cook
 * 8th: Lake, McHenry, and Boone
 * 10th: Ogle and Winnebago
 * 12th: Stephenson, Jo Daviess, and Carroll
 * 14th: Kane and Kendall
 * 16th: Marshall, Putnam, Livingston, and Woodford
 * 18th: Peoria
 * 20th: Grundy, Kankakee, and Iroquois
 * 22nd: Vermillion and Edgar
 * 24th: Champaign, Piatt, and Moultrie
 * 26th: Ford and McLean
 * 28th: DeWitt, Logan, and Macon
 * 30th: Tazewell, Mason, Menard, Cass, Schuyler, and Brown
 * 32nd: Hancock, McDonough, and Warren
 * 33rd: Henderson, Mercer, and Rock Island
 * 34th: Douglas, Coles, and Clark
 * 35th: Whiteside, Lee, and DeKalb
 * 36th: Adams, Pike, Calhoun, and Scott
 * 37th: Henry, Stark, and Bureau
 * 38th: Greene, Jersey, Macoupin, and Montgomery
 * 39th: LaSalle
 * 40th: Christian, Shelby, Cumberland, and Fayette
 * 41st: DuPage and Will
 * 42nd: Clinton, Marion, Clay, and Effingham
 * 43rd: Knox and Fulton
 * 44th: Jackson, Perry, Washington, Randolph, and Monroe
 * 45th: Morgan and Sangamon
 * 46th: Jefferson, Wayne, Richland, and Jasper
 * 47th: Madison and Bond
 * 48th: Hardin, Gallatin, White, Edwards, Wabash, Lawrence, and Crawford
 * 49th: St. Clair
 * 50th: Hamilton, Saline, Pope, Johnson, and Massac
 * 51st: Franklin, Williamson, Union, Pulaski, and Alexander

Senate
There were 51 senators.

Unless otherwise stated, "Chairman of the Committee on X" is abbreviated to "Chairman of X", etc.

House of Representatives
Prior to the Cutback Amendment in 1980, each district in the Illinois House of Representatives elected three members via cumulative voting. There were 79 Republicans, and the rest were mostly Democrats with a few Socialists and Progressives.