Pennsylvania State Senate District 21

State Legislative District Profile (Upper Chamber)

Overview

District ID
pa-sd-021
State
Pennsylvania
Chamber
Upper chamber (state senate)
District Code
021
Land Area
3,313.2 sq mi
Water Area
41.3 sq mi

Boundary

Boundary of Pennsylvania 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
Warren County884.28 sq mi26.7%100.0%
Venango County674.26 sq mi20.4%100.0%
Butler County647.98 sq mi19.6%82.1%
Clarion County600.84 sq mi18.1%100.0%
Forest County427.26 sq mi12.9%100.0%
Erie County78.54 sq mi2.4%9.8%

Showing all 6 counties

Places

PlaceOverlapShare of district landShare of place land
Sugarcreek borough37.51 sq mi1.1%100.0%
North Warren CDP8.19 sq mi0.2%100.0%
Shanor-Northvue CDP6.75 sq mi0.2%100.0%
Homeacre-Lyndora CDP6.64 sq mi0.2%100.0%
Marienville CDP6.06 sq mi0.2%100.0%
Corry city5.99 sq mi0.2%100.0%
Franklin city4.68 sq mi0.1%100.0%
Oil City city4.49 sq mi0.1%100.0%
Prospect borough4.08 sq mi0.1%100.0%
West Liberty borough3.84 sq mi0.1%100.0%
Russell CDP3.52 sq mi0.1%96.1%
Oak Hills CDP3.36 sq mi0.1%99.6%
Barkeyville borough3.32 sq mi0.1%100.0%
Warren city2.91 sq mi0.1%100.0%
Cherry Valley borough2.82 sq mi0.1%100.0%
Meridian CDP2.82 sq mi0.1%100.0%
Butler city2.72 sq mi0.1%100.0%
Nixon CDP2.69 sq mi0.1%100.0%
Unionville CDP2.57 sq mi0.1%100.0%
Crown CDP2.54 sq mi0.1%100.0%
Vowinckel CDP2.47 sq mi0.1%100.0%
Columbus CDP2.28 sq mi0.1%100.0%
Kennerdell CDP2.25 sq mi0.1%100.0%
Seneca CDP2.25 sq mi0.1%85.4%
Polk borough2.03 sq mi0.1%100.0%

Showing top 25 of 74 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 16145,13956.1%19.0%28.3%
PA District 15113,68943.9%14.9%71.7%

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

Voters

Registered Voters
169,860
Active Voters
163,592 (96.3%)

Party Registration

PartyVotersShare
Democratic42,09624.8%
Republican104,52761.5%
Unaffiliated18,30410.8%
Other parties4,8902.9%
No party recorded430.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202674,871 (44.1%)0 (0.0%)0 (0.0%)
2023–2024139,660 (82.2%)13,911 (8.2%)31,181 (18.4%)
2021–2022104,560 (61.6%)0 (0.0%)0 (0.0%)
2019–2020119,327 (70.3%)16,706 (9.8%)33,758 (19.9%)
2017–201882,191 (48.4%)0 (0.0%)0 (0.0%)
2015–201693,772 (55.2%)17,702 (10.4%)35,186 (20.7%)
2013–201456,875 (33.5%)0 (0.0%)0 (0.0%)
2011–201276,367 (45.0%)6,735 (4.0%)15,919 (9.4%)

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
256,770 (± 498)
Median Age
45.2
Median Household Income
$65,242 (± $1,297)
High School Graduate or Higher (age 25+)
92.9%
Bachelor's Degree or Higher (age 25+)
23.0%

Population by Age

GroupPeopleShare
Under 1846,37518.1%
18 to 64151,73459.1%
65 and over58,66122.8%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)4,1801.6%
White, not Hispanic238,94393.1%
Black, not Hispanic3,6481.4%
Asian, not Hispanic1,2240.5%
American Indian / Alaska Native, not Hispanic1040.0%
Native Hawaiian / Pacific Islander, not Hispanic810.0%
Some other race, not Hispanic1,2080.5%
Two or more races, not Hispanic7,3822.9%

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
255,642
Citizen Voting Age Population (CVAP)
209,370

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic251,71098.5%
Hispanic3,9361.5%
White243,05295.1%
Black3,5391.4%
Asian9630.4%
American Indian / Alaska Native1040.0%
Native Hawaiian / Pacific Islander830.0%
Two or More Races3990.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic206,61698.7%
Hispanic2,7531.3%
White200,30895.7%
Black3,6771.8%
Asian1,3340.6%
American Indian / Alaska Native1,0190.5%
Native Hawaiian / Pacific Islander660.0%
Two or More Races3010.1%

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