Pennsylvania 21st State Senate District, Pennsylvania: Republican loyalist district. In 2024, voted R+37%. Republican peak: R+38 in 2016.
Key facts
- 2024 presidential margin
- R+37MIT Election Lab
- Political archetype
- Republican loyalistAkashic typology
- Population
- 257,1882024 5-year
- Median household income
- $74,1652024 5-year
- White (non-Hispanic)
- 92.7%2024 5-year
- Black
- 1.7%2024 5-year
- Hispanic / Latino
- 1.8%2024 5-year
- Peak Republican margin
- R+38 in 2016MIT Election Lab
Constituent county margins for State Senate District 21, PAOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
R+60D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
5 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 45,419 | 99,580 | 146,185 | ||
| R | 43,522 | 95,418 | 140,848 | ||
| R | 35,207 | 82,821 | 124,340 | ||
| R | 40,065 | 72,966 | 115,142 | ||
| R | 47,196 | 70,896 | 120,421 |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
30.5%
Irish
16.6%
English
10.8%
Italian
8.8%
Polish
5.7%
American
4.9%
Scottish
1.9%
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 44.5 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$74,165
State Senate District 21 ranks near the middle of US counties.
State Senate District 21$74,165
Pennsylvania$77,971
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
10.6%
Child poverty is below the national average.
Children under 1812.5%
Working age (18–64)10.0%
Seniors (65+)11.1%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
96.6%
speak English only
Other Indo-European1.6%
Spanish1.0%
Asian & Pacific Islander0.5%
Other languages0.2%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 52.6% of residents not counted as adherents by any reporting body.
Stretching across rural south-central Pennsylvania, this district delivered a nearly 40-point Republican presidential margin in 2024, reflecting the demographic and economic profile common to small-town and agricultural communities in the region.
The Republican margin in Pennsylvania 21st State Senate District reached its widest at thirty-eight points in 2016. The margin in 2024 was thirty-seven points, in line with the district's deep historical pattern.
Its loyalty is rooted in its place. Median household income of $74,165, a 93% non-Hispanic-white share, and a population of 257,188 together describe a district whose political habits are deeply settled.
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 21, Pennsylvania — The Long Memory. Akashic Intelligence — The Long Memory. https://tiers.akashic.app/sld-upper/42021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State Senate District 21, Pennsylvania vote in 2024?
In 2024, State Senate District 21, Pennsylvania voted Republican by 37.0 points (R+37), carried by the Republican candidate. Out of 146,185 votes cast, 45,419 went Democratic and 99,580 went Republican.
What is State Senate District 21, Pennsylvania's political archetype?
Akashic classifies State Senate District 21, Pennsylvania as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 5 elections in the dataset, the district has voted Democratic 0 times, Republican 5 times, and other 0 times.
How many people live in State Senate District 21, Pennsylvania?
State Senate District 21, Pennsylvania has a population of 257,188 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 21, Pennsylvania?
Median household income in State Senate District 21, Pennsylvania is $74,165 — below the national median of $80,734. The Pennsylvania state median is $77,971.
What is the political history of State Senate District 21, Pennsylvania?
Akashic tracks 5 presidential elections in State Senate District 21, Pennsylvania from 2008 to 2024. Of those, 0 went Democratic and 5 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.