Wisconsin State Senate District 15

State Legislative District Profile (Upper Chamber)

Overview

District ID
wi-sd-015
State
Wisconsin
Chamber
Upper chamber (state senate)
District Code
015
Land Area
741.2 sq mi
Water Area
9.77 sq mi

Boundary

Boundary of Wisconsin 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
Rock County645.31 sq mi87.1%89.9%
Walworth County69.99 sq mi9.4%12.6%
Jefferson County25.38 sq mi3.4%4.6%
Dane County0.53 sq mi0.1%<0.1%

Showing all 4 counties

Places

PlaceOverlapShare of district landShare of place land
Janesville city34.16 sq mi4.6%98.6%
Beloit city17.33 sq mi2.3%99.8%
Whitewater city8.84 sq mi1.2%100.0%
Milton city4.26 sq mi0.6%90.5%
Edgerton city4.16 sq mi0.6%100.0%
Evansville city3.26 sq mi0.4%89.4%
Orfordville village1.19 sq mi0.2%100.0%
Footville village1.12 sq mi0.2%99.5%
Lake Lorraine CDP1.12 sq mi0.2%100.0%
Turtle Lake village0.87 sq mi0.1%30.1%
Hanover CDP0.58 sq mi0.1%100.0%
Shopiere CDP0.22 sq mi<0.1%99.8%
Fulton CDP0.16 sq mi<0.1%100.0%

Showing all 13 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 1138,92377.8%18.9%43.4%
WI District 235,75720.0%4.9%53.2%
WI District 53,9052.2%0.5%3.4%

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

Voters

Registered Voters
107,661
Active Voters
107,661 (100.0%)

Party Registration

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

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202494,085 (87.4%)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
180,166 (± 452)
Median Age
38.6
Median Household Income
$74,777 (± $2,000)
High School Graduate or Higher (age 25+)
92.6%
Bachelor's Degree or Higher (age 25+)
26.6%

Population by Age

GroupPeopleShare
Under 1838,40421.3%
18 to 64110,80761.5%
65 and over30,95517.2%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)18,37510.2%
White, not Hispanic143,37779.6%
Black, not Hispanic8,0404.5%
Asian, not Hispanic2,2661.3%
American Indian / Alaska Native, not Hispanic1250.1%
Native Hawaiian / Pacific Islander, not Hispanic100.0%
Some other race, not Hispanic5500.3%
Two or more races, not Hispanic7,4234.1%

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
174,695
Citizen Voting Age Population (CVAP)
136,519

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic160,41891.8%
Hispanic14,2808.2%
White144,88282.9%
Black8,1804.7%
Asian1,7901.0%
American Indian / Alaska Native1290.1%
Native Hawaiian / Pacific Islander00.0%
Two or More Races1880.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic128,76294.3%
Hispanic7,7585.7%
White118,87387.1%
Black6,8015.0%
Asian2,0011.5%
American Indian / Alaska Native9500.7%
Native Hawaiian / Pacific Islander00.0%
Two or More Races1560.1%

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