U.S. House seat · lines in effect since 2022
Colorado's 4th District
A district of about 749,000 people, 48% of adults with a bachelor's degree. It votes R+18.8 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 | R+24.7 | No race | R+23.8 | No race | No race | No race |
| Governor | No race | R+23.5 | No race | No race | No race | No race |
| U.S. House | No race | No race | No race | R+24.4 | R+11.6 | D+0.8 |
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 StateUpdated 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-4.
Higher than 86% of seats.
Higher than 50% of seats.
Higher than 55% of seats.
Lower than 88% of seats.
Higher than 54% of seats.
Less dense than 95% 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. 1 of the 4 flipped this year.
TX-1022% Hispanic · 43% college gradsR+20.4Held RUT-4
41% college gradsR+33.8Held RMT-1
39% college gradsR+11.6Flipped DNE-1
37% college gradsR+12.7Held R
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.
- Lauren Boebert (R)
2025– · Won 2024 by 11.6 - Ken Buck (R)
2023–2025 · Won 2022 by 24.4
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)