Colorado State Senate District 1

State Legislative District Profile (Upper Chamber)

Overview

District ID
co-sd-001
State
Colorado
Chamber
Upper chamber (state senate)
District Code
001
Land Area
12,724.2 sq mi
Water Area
55.1 sq mi

Boundary

Boundary of Colorado State Senate District 1

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Weld County3486.60 sq mi27.4%87.5%
Washington County2518.08 sq mi19.8%100.0%
Yuma County2364.40 sq mi18.6%100.0%
Logan County1838.60 sq mi14.4%100.0%
Morgan County1280.49 sq mi10.1%100.0%
Phillips County687.93 sq mi5.4%100.0%
Sedgwick County548.04 sq mi4.3%100.0%

Showing all 7 counties

Places

PlaceOverlapShare of district landShare of place land
Greeley city31.46 sq mi0.2%62.7%
Severance town9.09 sq mi0.1%70.5%
Sterling city7.58 sq mi0.1%99.5%
Keenesburg town7.54 sq mi0.1%80.6%
Hudson town5.90 sq mi<0.1%99.9%
Fort Morgan city5.33 sq mi<0.1%99.7%
Kirk CDP4.10 sq mi<0.1%100.0%
Nunn town3.96 sq mi<0.1%99.6%
Wray city3.48 sq mi<0.1%100.0%
Lochbuie town3.47 sq mi<0.1%94.3%
Yuma city3.17 sq mi<0.1%96.9%
Eaton town3.16 sq mi<0.1%100.0%
Jackson Lake CDP3.06 sq mi<0.1%100.0%
Brush city2.83 sq mi<0.1%100.0%
Akron town2.77 sq mi<0.1%100.0%
Holyoke city2.47 sq mi<0.1%99.9%
Joes CDP2.09 sq mi<0.1%100.0%
Kersey town2.02 sq mi<0.1%85.5%
Pierce town1.86 sq mi<0.1%100.0%
Cope CDP1.80 sq mi<0.1%100.0%
Ault town1.73 sq mi<0.1%97.9%
Julesburg town1.51 sq mi<0.1%100.0%
Wiggins town1.32 sq mi<0.1%100.0%
Vernon CDP1.13 sq mi<0.1%100.0%
Atwood CDP1.03 sq mi<0.1%100.0%

Showing top 25 of 53 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 4105,59764.8%14.6%97.3%
CO District 857,23935.2%7.9%2.7%

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

Voters

Registered Voters
125,306
Active Voters
114,444 (91.3%)

Party Registration

PartyVotersShare
Democratic16,10312.9%
Republican49,39939.4%
Unaffiliated56,84245.4%
Other parties2,9622.4%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202645,637 (36.4%)0 (0.0%)0 (0.0%)
2023–202491,438 (73.0%)5,876 (4.7%)27,780 (22.2%)
2021–202270,008 (55.9%)4,217 (3.4%)20,267 (16.2%)
2019–202086,003 (68.6%)9,035 (7.2%)26,880 (21.5%)
2017–201866,215 (52.8%)5,352 (4.3%)17,183 (13.7%)
2015–201669,635 (55.6%)3,493 (2.8%)13,043 (10.4%)
2013–201450,797 (40.5%)3,071 (2.5%)14,963 (11.9%)
2011–201256,843 (45.4%)2,474 (2.0%)9,749 (7.8%)

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
166,427 (± 2,733)
Median Age
38.6
Median Household Income
$82,469 (± $2,465)
High School Graduate or Higher (age 25+)
89.7%
Bachelor's Degree or Higher (age 25+)
27.5%

Population by Age

GroupPeopleShare
Under 1839,60023.8%
18 to 6498,53159.2%
65 and over28,29617.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)44,37426.7%
White, not Hispanic112,00167.3%
Black, not Hispanic2,3201.4%
Asian, not Hispanic1,3810.8%
American Indian / Alaska Native, not Hispanic7400.4%
Native Hawaiian / Pacific Islander, not Hispanic840.1%
Some other race, not Hispanic6630.4%
Two or more races, not Hispanic4,8642.9%

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
157,974
Citizen Voting Age Population (CVAP)
119,187

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic121,00276.6%
Hispanic36,97123.4%
White113,39371.8%
Black2,3721.5%
Asian1,0490.7%
American Indian / Alaska Native7540.5%
Native Hawaiian / Pacific Islander850.1%
Two or More Races2040.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic96,12780.7%
Hispanic23,05719.3%
White90,36675.8%
Black2,6142.2%
Asian1,2321.0%
American Indian / Alaska Native1,7761.5%
Native Hawaiian / Pacific Islander820.1%
Two or More Races1140.1%

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