Colorado State Senate District 15

State Legislative District Profile (Upper Chamber)

Overview

District ID
co-sd-015
State
Colorado
Chamber
Upper chamber (state senate)
District Code
015
Land Area
3,004.6 sq mi
Water Area
34.8 sq mi

Boundary

Boundary of Colorado State Senate District 15

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Larimer County2434.52 sq mi81.0%93.8%
Boulder County570.19 sq mi19.0%78.5%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Loveland city34.42 sq mi1.1%96.0%
Allenspark CDP11.94 sq mi0.4%100.0%
Red Feather Lakes CDP9.12 sq mi0.3%100.0%
Estes Park town6.82 sq mi0.2%100.0%
Laporte CDP6.12 sq mi0.2%100.0%
Lazy Acres CDP5.29 sq mi0.2%100.0%
Eldora CDP4.16 sq mi0.1%100.0%
Wellington town3.63 sq mi0.1%94.6%
Pine Brook Hill CDP3.03 sq mi0.1%100.0%
Eldorado Springs CDP2.58 sq mi0.1%100.0%
Sugarloaf CDP2.18 sq mi0.1%100.0%
Coal Creek town2.12 sq mi0.1%100.0%
Gold Hill CDP2.07 sq mi0.1%99.9%
Sunshine CDP1.73 sq mi0.1%100.0%
Mountain Meadows CDP1.72 sq mi0.1%100.0%
Altona CDP1.69 sq mi0.1%100.0%
Nederland town1.48 sq mi<0.1%100.0%
Crisman CDP1.46 sq mi<0.1%100.0%
St. Ann Highlands CDP1.39 sq mi<0.1%100.0%
Lyons town1.35 sq mi<0.1%98.9%
Glendale city1.26 sq mi<0.1%100.0%
Bark Ranch CDP0.86 sq mi<0.1%100.0%
Hidden Lake CDP0.61 sq mi<0.1%100.0%
Jamestown town0.57 sq mi<0.1%100.0%
Tall Timber CDP0.57 sq mi<0.1%100.0%

Showing top 25 of 28 places

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 496,02259.8%13.3%3.7%
CO District 264,61640.2%9.0%96.3%

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

Voters

Registered Voters
138,717
Active Voters
126,391 (91.1%)

Party Registration

PartyVotersShare
Democratic30,78022.2%
Republican34,44424.8%
Unaffiliated70,22750.6%
Other parties3,2662.4%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202664,855 (46.8%)0 (0.0%)0 (0.0%)
2023–2024108,068 (77.9%)15,685 (11.3%)19,325 (13.9%)
2021–202287,595 (63.1%)11,657 (8.4%)14,689 (10.6%)
2019–202099,252 (71.5%)21,699 (15.6%)19,286 (13.9%)
2017–201878,082 (56.3%)13,318 (9.6%)11,606 (8.4%)
2015–201679,959 (57.6%)6,487 (4.7%)9,815 (7.1%)
2013–201460,700 (43.8%)6,323 (4.6%)11,216 (8.1%)
2011–201267,326 (48.5%)4,862 (3.5%)7,324 (5.3%)

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
162,618 (± 1,821)
Median Age
43.8
Median Household Income
$96,163 (± $2,845)
High School Graduate or Higher (age 25+)
96.1%
Bachelor's Degree or Higher (age 25+)
46.4%

Population by Age

GroupPeopleShare
Under 1831,26419.2%
18 to 6495,20358.5%
65 and over36,15122.2%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)19,76712.2%
White, not Hispanic133,31782.0%
Black, not Hispanic1,0830.7%
Asian, not Hispanic1,7971.1%
American Indian / Alaska Native, not Hispanic2890.2%
Native Hawaiian / Pacific Islander, not Hispanic1260.1%
Some other race, not Hispanic7520.5%
Two or more races, not Hispanic5,4873.4%

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
159,449
Citizen Voting Age Population (CVAP)
128,322

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic141,33488.6%
Hispanic18,11111.4%
White134,55284.4%
Black1,0820.7%
Asian1,4030.9%
American Indian / Alaska Native2890.2%
Native Hawaiian / Pacific Islander1030.1%
Two or More Races4440.3%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic117,26191.4%
Hispanic11,0658.6%
White112,28887.5%
Black1,2641.0%
Asian2,0101.6%
American Indian / Alaska Native1,2791.0%
Native Hawaiian / Pacific Islander1060.1%
Two or More Races3270.3%

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