Overview
- District ID
- co-sd-035
- State
- Colorado
- Chamber
- Upper chamber (state senate)
- District Code
- 035
- Land Area
- 25,652.7 sq mi
- Water Area
- 93.7 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 13 counties
Places
Showing top 25 of 72 places
Overlapping Congressional Districts
| Congressional district | Population in both | Share of this district's population | Share of the congressional district's population | Share of this district's land |
|---|
| CO District 4 | 77,154 | 44.8% | 10.7% | 67.4% |
| CO District 5 | 54,908 | 31.9% | 7.6% | 2.9% |
| CO District 3 | 40,065 | 23.3% | 5.6% | 29.7% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 142,676
- Active Voters
- 128,441 (90.0%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 18,299 | 12.8% |
| Republican | 56,294 | 39.5% |
| Unaffiliated | 64,847 | 45.5% |
| Other parties | 3,236 | 2.3% |
| No party recorded | 0 | 0.0% |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 56,005 (39.3%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 104,867 (73.5%) | 8,175 (5.7%) | 33,627 (23.6%) |
| 2021–2022 | 83,527 (58.5%) | 6,734 (4.7%) | 25,343 (17.8%) |
| 2019–2020 | 96,011 (67.3%) | 11,313 (7.9%) | 31,825 (22.3%) |
| 2017–2018 | 71,979 (50.4%) | 7,562 (5.3%) | 21,200 (14.9%) |
| 2015–2016 | 76,962 (53.9%) | 5,255 (3.7%) | 16,978 (11.9%) |
| 2013–2014 | 58,108 (40.7%) | 4,809 (3.4%) | 16,138 (11.3%) |
| 2011–2012 | 62,778 (44.0%) | 4,410 (3.1%) | 12,723 (8.9%) |
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
- 174,106 (± 2,691)
- Median Age
- 42.4
- Median Household Income
- $83,747 (± $2,761)
- High School Graduate or Higher (age 25+)
- 92.6%
- Bachelor's Degree or Higher (age 25+)
- 29.8%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 38,972 | 22.4% |
| 18 to 64 | 101,988 | 58.6% |
| 65 and over | 33,146 | 19.0% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 36,265 | 20.8% |
| White, not Hispanic | 120,896 | 69.4% |
| Black, not Hispanic | 4,624 | 2.7% |
| Asian, not Hispanic | 1,722 | 1.0% |
| American Indian / Alaska Native, not Hispanic | 808 | 0.5% |
| Native Hawaiian / Pacific Islander, not Hispanic | 189 | 0.1% |
| Some other race, not Hispanic | 761 | 0.4% |
| Two or more races, not Hispanic | 8,841 | 5.1% |
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
- 170,601
- Citizen Voting Age Population (CVAP)
- 132,012
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 136,761 | 80.2% |
| Hispanic | 33,839 | 19.8% |
| White | 123,274 | 72.3% |
| Black | 4,706 | 2.8% |
| Asian | 1,603 | 0.9% |
| American Indian / Alaska Native | 808 | 0.5% |
| Native Hawaiian / Pacific Islander | 178 | 0.1% |
| Two or More Races | 626 | 0.4% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 108,466 | 82.2% |
| Hispanic | 23,550 | 17.8% |
| White | 99,250 | 75.2% |
| Black | 4,217 | 3.2% |
| Asian | 2,002 | 1.5% |
| American Indian / Alaska Native | 2,669 | 2.0% |
| Native Hawaiian / Pacific Islander | 132 | 0.1% |
| Two or More Races | 289 | 0.2% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).