United States congressional delegations from Colorado

Since Colorado became a U.S. state in 1876, it has sent congressional delegations to the United States Senate and United States House of Representatives, beginning with the 44th United States Congress. Prior to statehood, the Colorado Territory sent non-voting delegates to the House of Representatives from 1861 to 1876. Each state elects two senators to serve for six years, and members of the House to two-year terms. Each state elects two senators to serve for six years in general elections, with their re-election staggered. Prior to the ratification of the Seventeenth Amendment in 1913, senators were elected by the Colorado General Assembly. Each state elects varying numbers of members of the House, depending on population, to two-year terms. Colorado has sent eight members to the House in each congressional delegation since the 2020 United States Census.

Current delegation
Colorado's current congressional delegation to the consists of two senators, both of whom are Democrats, and eight representatives comprising five Democrats and three Republicans.

United States House of Representatives
The state of Colorado gained an CO's 8th congressional district beginning in 2023. The current dean of the Colorado delegation is Representative Diana DeGette of the CO's 1st congressional district, having served in the House since 1997.

United States Senate
Two senators from Colorado, Henry M. Teller and Ken Salazar, have also served as the United States Secretary of the Interior, under the Arthur administration and Obama administration respectively. Salazar is currently serving as the United States ambassador to Mexico under the Biden administration. Many senators from Colorado, including John F. Shafroth and Edwin C. Johnson, also served as the governor of Colorado. Many of Colorado's senators have been at the forefront of national politics during their careers, including Eugene Millikin, who served as the chairman of the Senate Republican Conference, and Gary Hart, who finished second in the 1984 Democratic Party presidential primaries and was considered a frontrunner in the 1988 Democratic Party presidential primaries.

Senators are elected every six years depending on their class, with each senator serving a six-year term, and elections for senators occurring every two years, rotating through each class such that each election, around one-third of the seats in the Senate are up for election. Colorado's senators are elected in classes II and III. Currently, Colorado is represented in the Senate by Michael Bennet and John Hickenlooper.

1861–1876: 1 non-voting delegate
Starting on August 19, 1861, the Territory of Colorado sent a non-voting delegate to the House.

1876–1893: 1 seat
Following statehood on August 1, 1876, the state of Colorado was granted one seat in the House.

1893–1903: 2 seats
Following the 1890 census, Colorado was apportioned with two seats.

1903–1913: 3 seats
Following the 1900 census, Colorado was apportioned with three seats.

1913–1973: 4 seats
Following the 1910 census, Colorado was apportioned with four seats.

1973–1983: 5 seats
Following the 1970 census, Colorado was apportioned with five seats.

1983–2003: 6 seats
Following the 1980 census, Colorado was apportioned six seats.

2003–2023: 7 seats
Following the 2000 census, Colorado was apportioned seven seats.

2023–present: 8 seats
Since the 2020 census, Colorado has been apportioned eight seats.