Colorado
8 congressional districts.
Map
- Very compact (0 to 19)
- Compact (20 to 39)
- Middle (40 to 59)
- Irregular (60 to 79)
- Very irregular (80 to 100)
Select a district for details.
The area outlined with dashes on the map, enlarged so its smaller districts can be seen.
Map used in 2026
2021 Independent Congressional Redistricting Commission map
- Drawn by
- a redistricting commission
- Enacted
- 2021-11-01
- Changed since 2024
- No
Source: Colorado Independent Redistricting Commissions (checked 2026-11-04)
Districts
| District | Irregularity | National rank |
|---|---|---|
| CO-01 | Irregularity score 96 Very irregular | 9th least compact |
| CO-02 | Irregularity score 13 Very compact | 403rd least compact |
| CO-03 | Irregularity score 42 Middle of the pack | 252nd least compact |
| CO-04 | Irregularity score 31 Compact | 316th least compact |
| CO-05 | Irregularity score 14 Very compact | 396th least compact |
| CO-06 | Irregularity score 89 Very irregular | 29th least compact |
| CO-07 | Irregularity score 55 Middle of the pack | 180th least compact |
| CO-08 | Irregularity score 66 Irregular | 124th least compact |
Scores describe shape, not intent. How scores work
Colorado's senators
- Michael F. Bennet, Democrat
- John W. Hickenlooper, DemocratRe-elected November 3, 2026.
Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from
Partisan fairness
How the 2024 presidential vote splits across these districts. Kamala Harris (Democrat) won 55.6% of the two-party vote and carried 4 of 8 districts.
- Efficiency gap
- 11.1% Favors Republicans
Counts each party's wasted votes: votes for a losing candidate, plus a winner's votes beyond the half needed to win. The gap is the difference between the two parties' wasted votes, as a share of all votes.
- Mean-median difference
- 2.5 points Favors Republicans
The gap between a party's average vote share across the districts and its share in the middle (median) district. When the middle district leans away from a party's average, that party's voters are packed into a few lopsided districts.
- Declination
- 0.25 Favors Republicans
Compares how lopsided each party's wins are. A party that wins a few districts by huge margins and loses the rest narrowly is at a disadvantage. Runs from 0 (even) to 1.
Votes are 2024 presidential results by precinct, added up within each district. This state used the same districts in 2024 and 2026. These measures show how a map turns one election's votes into seats. They don't show why the lines were drawn, and they shift from one election to the next. How fairness scores work