Colorado State House District 12

State Legislative District Profile (Lower Chamber)

Overview

District ID
co-hd-012
State
Colorado
Chamber
Lower chamber
District Code
012
Land Area
76.1 sq mi
Water Area
3 sq mi

Boundary

Boundary of Colorado State House District 12

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Boulder County75.81 sq mi99.7%10.4%
Broomfield County0.24 sq mi0.3%0.7%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Lafayette city9.22 sq mi12.1%99.7%
Louisville city7.96 sq mi10.5%99.9%
Gunbarrel CDP6.24 sq mi8.2%99.9%
Niwot CDP4.00 sq mi5.3%100.0%
Superior town3.72 sq mi4.9%94.7%
Paragon Estates CDP1.68 sq mi2.2%100.0%
Valmont CDP0.27 sq mi0.4%100.0%
Broomfield city0.24 sq mi0.3%0.7%
Erie town0.00 sq mi<0.1%<0.1%

Showing all 9 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 286,418100.0%12.0%100.0%
CO District 700.0%0.0%<0.1%

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

Voters

Registered Voters
69,907
Active Voters
63,878 (91.4%)

Party Registration

PartyVotersShare
Democratic26,63938.1%
Republican6,9549.9%
Unaffiliated35,11450.2%
Other parties1,2001.7%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202635,805 (51.2%)0 (0.0%)0 (0.0%)
2023–202456,221 (80.4%)14,303 (20.5%)3,843 (5.5%)
2021–202247,205 (67.5%)11,626 (16.6%)2,816 (4.0%)
2019–202050,686 (72.5%)19,700 (28.2%)4,049 (5.8%)
2017–201841,628 (59.5%)12,258 (17.5%)2,747 (3.9%)
2015–201640,655 (58.2%)5,639 (8.1%)2,289 (3.3%)
2013–201431,490 (45.0%)4,754 (6.8%)2,720 (3.9%)
2011–201233,554 (48.0%)4,719 (6.8%)2,059 (2.9%)

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
85,779 (± 1,037)
Median Age
41.4
Median Household Income
$137,727 (± $7,168)
High School Graduate or Higher (age 25+)
97.4%
Bachelor's Degree or Higher (age 25+)
69.2%

Population by Age

GroupPeopleShare
Under 1818,57121.6%
18 to 6452,66461.4%
65 and over14,54417.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)10,46312.2%
White, not Hispanic64,51075.2%
Black, not Hispanic6160.7%
Asian, not Hispanic4,6885.5%
American Indian / Alaska Native, not Hispanic260.0%
Native Hawaiian / Pacific Islander, not Hispanic560.1%
Some other race, not Hispanic3590.4%
Two or more races, not Hispanic5,0615.9%

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
81,904
Citizen Voting Age Population (CVAP)
63,579

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic72,44788.5%
Hispanic9,46011.6%
White64,96579.3%
Black6070.7%
Asian3,5814.4%
American Indian / Alaska Native270.0%
Native Hawaiian / Pacific Islander570.1%
Two or More Races3530.4%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic57,66190.7%
Hispanic5,9189.3%
White52,71382.9%
Black8231.3%
Asian3,6465.7%
American Indian / Alaska Native2210.3%
Native Hawaiian / Pacific Islander200.0%
Two or More Races2430.4%

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