Wisconsin State Senate District 21

State Legislative District Profile (Upper Chamber)

Overview

District ID
wi-sd-021
State
Wisconsin
Chamber
Upper chamber (state senate)
District Code
021
Land Area
146.7 sq mi
Water Area
0.82 sq mi

Boundary

Boundary of Wisconsin State Senate District 21

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Racine County94.09 sq mi64.2%28.3%
Milwaukee County52.59 sq mi35.9%21.8%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Caledonia village45.23 sq mi30.8%100.0%
Raymond village35.66 sq mi24.3%100.0%
Franklin city34.57 sq mi23.6%100.0%
Racine city9.63 sq mi6.6%62.2%
Greenfield city7.09 sq mi4.8%61.5%
Greendale village5.57 sq mi3.8%100.0%
Hales Corners village3.19 sq mi2.2%100.0%
Mount Pleasant village2.21 sq mi1.5%6.5%
Milwaukee city2.14 sq mi1.5%2.2%
Wind Point village1.27 sq mi0.9%100.0%
North Bay village0.11 sq mi0.1%100.0%
West Allis city0.02 sq mi<0.1%0.2%

Showing all 12 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
WI District 1144,13780.4%19.6%93.7%
WI District 519,46410.9%2.6%4.8%
WI District 415,5838.7%2.1%1.5%

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

Voters

Registered Voters
112,031
Active Voters
112,031 (100.0%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202499,492 (88.8%)0 (0.0%)0 (0.0%)

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 05/15/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
179,053 (± 2,473)
Median Age
40.5
Median Household Income
$77,801 (± $2,581)
High School Graduate or Higher (age 25+)
92.9%
Bachelor's Degree or Higher (age 25+)
34.3%

Population by Age

GroupPeopleShare
Under 1842,59223.8%
18 to 64101,81456.9%
65 and over34,64719.4%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)27,78915.5%
White, not Hispanic123,63069.0%
Black, not Hispanic13,2867.4%
Asian, not Hispanic5,6083.1%
American Indian / Alaska Native, not Hispanic3200.2%
Native Hawaiian / Pacific Islander, not Hispanic2100.1%
Some other race, not Hispanic4760.3%
Two or more races, not Hispanic7,7344.3%

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
172,486
Citizen Voting Age Population (CVAP)
130,601

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic148,05385.8%
Hispanic24,43214.2%
White124,47272.2%
Black13,2627.7%
Asian3,7352.2%
American Indian / Alaska Native3200.2%
Native Hawaiian / Pacific Islander2100.1%
Two or More Races4080.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic116,13088.9%
Hispanic14,46811.1%
White100,58377.0%
Black10,7308.2%
Asian3,5412.7%
American Indian / Alaska Native9130.7%
Native Hawaiian / Pacific Islander1900.1%
Two or More Races2450.2%

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