99chambers

U.S. House seat · lines in effect since 2022

Colorado's 7th District

A district of about 727,000 people, 50% of adults with a bachelor's degree. It votes D+15.2 relative to the nation for president.

Brittany Pettersen (D) · since Jan 3, 2023Next election Nov 7, 2028The 2026 race →
CO-7

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.

D+15.2143rd most
Democratic
Most DemocraticMost Republican218th seat · the majority line126CO-78354

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.

201620182020202220242026
U.S. SenateD+4.1No raceD+9.9No raceNo raceNo race
GovernorNo raceD+10.0No raceNo raceNo raceNo race
U.S. HouseNo raceNo raceNo raceD+15.0D+14.2D+24.6

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-7.

Adults with a bachelor's degree50% 88th pct · 3rd of 8 in CO

Higher than 88% of seats.

White adults without a degree37% 47th pct · 4th of 8 in CO

Lower than 53% of seats.

Hispanic residents15% 56th pct · 6th of 8 in CO

Higher than 56% of seats.

Black residents1% 5th pct · 6th of 8 in CO

Lower than 95% of seats.

Asian residents3% 46th pct · 5th of 8 in CO

Lower than 54% of seats.

People per square mile101 24th pct · 5th of 8 in CO

Less dense than 76% 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.

KS-3
52% college gradsD+4.7Held DMA-9
43% college gradsD+12.8Held DPA-6
49% college gradsD+12.4Held DMA-2
46% college gradsD+26.1Held 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.

  1. Brittany Pettersen (D)
    2023– · Won 2022 by 15.0, 2024 by 14.2, 2026 by 24.6

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)