Wisconsin Assembly District 42

State Legislative District Profile (Lower Chamber)

Overview

District ID
wi-hd-042
State
Wisconsin
Chamber
Lower chamber
District Code
042
Land Area
476.5 sq mi
Water Area
14.5 sq mi

Boundary

Boundary of Wisconsin Assembly District 42

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Columbia County389.06 sq mi81.6%50.8%
Dane County87.43 sq mi18.3%7.3%
Dodge County0.02 sq mi<0.1%<0.1%

Showing all 3 counties

Places

PlaceOverlapShare of district landShare of place land
Windsor village27.56 sq mi5.8%100.0%
Lake Wisconsin CDP12.56 sq mi2.6%93.7%
DeForest village8.50 sq mi1.8%90.2%
Madison city7.71 sq mi1.6%9.2%
Columbus city4.55 sq mi1.0%100.0%
Doylestown village3.89 sq mi0.8%100.0%
Poynette village2.57 sq mi0.5%100.0%
Fall River village1.83 sq mi0.4%96.8%
Lodi city1.73 sq mi0.4%100.0%
Rio village1.25 sq mi0.3%99.9%
Dekorra CDP1.21 sq mi0.3%100.0%
Arlington village1.04 sq mi0.2%100.0%

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 230,09950.8%4.1%18.3%
WI District 629,10249.2%4.0%81.7%

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

Voters

Registered Voters
42,328
Active Voters
42,328 (100.0%)

Party Registration

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

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2023–202438,580 (91.1%)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
59,257 (± 1,101)
Median Age
41.2
Median Household Income
$101,042 (± $4,001)
High School Graduate or Higher (age 25+)
96.4%
Bachelor's Degree or Higher (age 25+)
36.6%

Population by Age

GroupPeopleShare
Under 1813,18922.3%
18 to 6436,18861.1%
65 and over9,88016.7%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)2,8924.9%
White, not Hispanic51,00286.1%
Black, not Hispanic1,4442.4%
Asian, not Hispanic1,6022.7%
American Indian / Alaska Native, not Hispanic1120.2%
Native Hawaiian / Pacific Islander, not Hispanic80.0%
Some other race, not Hispanic1070.2%
Two or more races, not Hispanic2,0903.5%

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
57,834
Citizen Voting Age Population (CVAP)
44,796

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic55,26295.6%
Hispanic2,5744.5%
White51,19388.5%
Black1,1592.0%
Asian1,1221.9%
American Indian / Alaska Native1110.2%
Native Hawaiian / Pacific Islander90.0%
Two or More Races880.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic43,40396.9%
Hispanic1,3953.1%
White41,09091.7%
Black9332.1%
Asian9532.1%
American Indian / Alaska Native3880.9%
Native Hawaiian / Pacific Islander90.0%
Two or More Races310.1%

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