Colorado State Senate District 31

State Legislative District Profile (Upper Chamber)

Overview

District ID
co-sd-031
State
Colorado
Chamber
Upper chamber (state senate)
District Code
031
Land Area
18.5 sq mi
Water Area
0.02 sq mi

Boundary

Boundary of Colorado State Senate District 31

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Denver County18.52 sq mi100.0%12.1%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Denver city18.52 sq mi100.0%12.1%

Showing all 1 place

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
CO District 1164,017100.0%22.7%100.0%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
137,619
Active Voters
113,757 (82.7%)

Party Registration

PartyVotersShare
Democratic55,02140.0%
Republican11,1518.1%
Unaffiliated68,18749.5%
Other parties3,2602.4%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202655,363 (40.2%)0 (0.0%)0 (0.0%)
2023–202498,565 (71.6%)22,955 (16.7%)4,467 (3.2%)
2021–202276,592 (55.7%)19,523 (14.2%)3,247 (2.4%)
2019–202083,987 (61.0%)33,116 (24.1%)4,878 (3.5%)
2017–201863,056 (45.8%)19,614 (14.3%)3,541 (2.6%)
2015–201659,982 (43.6%)11,750 (8.5%)2,713 (2.0%)
2013–201442,030 (30.5%)7,488 (5.4%)2,888 (2.1%)
2011–201246,596 (33.9%)5,356 (3.9%)1,747 (1.3%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 01/20/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
162,808 (± 3,111)
Median Age
36.8
Median Household Income
$99,883 (± $3,204)
High School Graduate or Higher (age 25+)
96.7%
Bachelor's Degree or Higher (age 25+)
71.8%

Population by Age

GroupPeopleShare
Under 1819,45812.0%
18 to 64120,43974.0%
65 and over22,91114.1%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)20,14312.4%
White, not Hispanic119,34873.3%
Black, not Hispanic9,4485.8%
Asian, not Hispanic4,7742.9%
American Indian / Alaska Native, not Hispanic2930.2%
Native Hawaiian / Pacific Islander, not Hispanic340.0%
Some other race, not Hispanic5120.3%
Two or more races, not Hispanic8,2565.1%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
156,187
Citizen Voting Age Population (CVAP)
137,218

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic138,37988.6%
Hispanic17,80611.4%
White119,44476.5%
Black8,8695.7%
Asian3,6022.3%
American Indian / Alaska Native2970.2%
Native Hawaiian / Pacific Islander00.0%
Two or More Races8100.5%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic123,38489.9%
Hispanic13,83010.1%
White107,52978.4%
Black8,7596.4%
Asian5,3093.9%
American Indian / Alaska Native1,2500.9%
Native Hawaiian / Pacific Islander10.0%
Two or More Races6690.5%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).