Pennsylvania State House District 21

State Legislative District Profile (Lower Chamber)

Overview

District ID
pa-hd-021
State
Pennsylvania
Chamber
Lower chamber
District Code
021
Land Area
19.2 sq mi
Water Area
0.8 sq mi

Boundary

Boundary of Pennsylvania State House District 21

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Allegheny County19.22 sq mi100.0%2.6%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Pittsburgh city4.73 sq mi24.6%8.5%
Glenshaw CDP2.77 sq mi14.4%88.5%
Allison Park CDP1.45 sq mi7.6%10.5%
Etna borough0.74 sq mi3.8%100.0%
Millvale borough0.62 sq mi3.2%100.0%

Showing all 5 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
PA District 1738,20061.6%5.0%75.4%
PA District 1223,80638.4%3.1%24.6%

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

Voters

Registered Voters
48,891
Active Voters
45,792 (93.7%)

Party Registration

PartyVotersShare
Democratic27,94757.2%
Republican13,11326.8%
Unaffiliated6,67013.6%
Other parties<10—
No party recorded<10—

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202623,518 (48.1%)0 (0.0%)0 (0.0%)
2023–202439,254 (80.3%)9,664 (19.8%)3,202 (6.5%)
2021–202230,653 (62.7%)0 (0.0%)0 (0.0%)
2019–202034,108 (69.8%)11,720 (24.0%)3,156 (6.5%)
2017–201824,672 (50.5%)0 (0.0%)0 (0.0%)
2015–201626,197 (53.6%)10,109 (20.7%)4,393 (9.0%)
2013–201414,429 (29.5%)0 (0.0%)0 (0.0%)
2011–201220,519 (42.0%)3,936 (8.1%)1,782 (3.6%)

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 01/05/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
61,741 (± 1,204)
Median Age
40.2
Median Household Income
$85,852 (± $3,828)
High School Graduate or Higher (age 25+)
95.8%
Bachelor's Degree or Higher (age 25+)
47.6%

Population by Age

GroupPeopleShare
Under 188,01513.0%
18 to 6441,19266.7%
65 and over12,53420.3%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)1,4802.4%
White, not Hispanic53,75887.1%
Black, not Hispanic2,8324.6%
Asian, not Hispanic1,2982.1%
American Indian / Alaska Native, not Hispanic20.0%
Native Hawaiian / Pacific Islander, not Hispanic590.1%
Some other race, not Hispanic2610.4%
Two or more races, not Hispanic2,0513.3%

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
60,601
Citizen Voting Age Population (CVAP)
52,588

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic59,26597.8%
Hispanic1,3362.2%
White54,04089.2%
Black2,6784.4%
Asian1,0661.8%
American Indian / Alaska Native50.0%
Native Hawaiian / Pacific Islander580.1%
Two or More Races1110.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic51,45497.8%
Hispanic1,1312.2%
White47,24589.8%
Black2,6865.1%
Asian1,1582.2%
American Indian / Alaska Native2430.5%
Native Hawaiian / Pacific Islander500.1%
Two or More Races1060.2%

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