U.S. House seat · lines in effect since 2022
Colorado's 1st District
A district of about 722,000 people, 28% Hispanic, 57% of adults with a bachelor's degree. It votes D+58.9 relative to the nation for president.
Source: 2026 results: Colorado Secretary of State and civicAPI; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET
Where it sits among all 435 seats
Every U.S. House seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Labels below the bar mark 7 other seats in Colorado.
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2020 | 2022 | 2024 | 2026 | |
|---|---|---|---|---|---|---|
| U.S. Senate | D+51.1 | No race | D+57.3 | No race | No race | No race |
| Governor | No race | D+57.8 | No race | No race | No race | No race |
| U.S. House | No race | No race | No race | D+62.8 | D+55.0 | D+64.2 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: Colorado Secretary of State and civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 435 seats. Small marks are other seats in Colorado. The black marker is CO-1.
Higher than 96% of seats.
Lower than 84% of seats.
Higher than 79% of seats.
Higher than 55% of seats.
Higher than 51% of seats.
Denser than 91% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
TX-3736% Hispanic · 55% college gradsD+59.4Held DMN-5
51% college gradsD+63.7Held DVA-8
20% Hispanic · 66% college gradsD+52.5Held DMA-7
23% Hispanic · 50% college gradsD+67.2Held D
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2022.
- Melat Kiros (D)
2027– · Won 2026 by 64.2 - Diana Degette (D)
2023–2027 · Won 2022 by 62.8, 2024 by 55.0
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)