Allegheny County, Pennsylvania: Realigning Affluent Suburb county. In 2024, voted D+20%. Republican peak: R+58 in 1904.
Key facts
- 2024 presidential margin
- D+20MIT Election Lab
- Political typology
- Realigning Affluent SuburbAkashic typology
- Population
- 1,238,1772024 5-year
- Median household income
- $78,5482024 5-year
- White (non-Hispanic)
- 76.1%2024 5-year
- Black
- 12.5%2024 5-year
- Hispanic / Latino
- 3.0%2024 5-year
- Peak Democratic margin
- D+34 in 1936MIT Election Lab
- Peak Republican margin
- R+58 in 1904MIT Election Lab
- Most similar
- District of Columbia, DC · similarity 0.98
2024 results by precinct
2024 precinct map of Allegheny CountyPrecinct-level 2024 presidential results for Allegheny County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −19.0% |
| 1896 | −43.3% |
| 1900 | −43.3% |
| 1904 | −58.3% |
| 1908 | −31.5% |
| 1912 | +6.0% |
| 1916 | −17.6% |
| 1920 | −49.1% |
| 1924 | −50.3% |
| 1928 | −14.5% |
| 1932 | +10.4% |
| 1936 | +33.9% |
| 1940 | +16.5% |
| 1944 | +14.6% |
| 1948 | +12.3% |
| 1952 | +1.6% |
| 1956 | −9.8% |
| 1960 | +14.3% |
| 1964 | +32.4% |
| 1968 | +14.0% |
| 1972 | −13.3% |
| 1976 | +3.9% |
| 1980 | +4.1% |
| 1984 | +13.2% |
| 1988 | +20.1% |
| 1992 | +23.0% |
| 1996 | +14.9% |
| 2000 | +16.2% |
| 2004 | +15.0% |
| 2008 | +15.5% |
| 2012 | +14.5% |
| 2016 | +16.5% |
| 2020 | +20.4% |
| 2024 | +20.2% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 429,916 | 283,595 | 723,799 | ||
| D | 429,065 | 282,324 | 719,733 | ||
| D | 367,617 | 259,480 | 657,189 | ||
| D | 352,687 | 262,039 | 623,827 | ||
| D | 373,153 | 272,347 | 651,436 | ||
| D | 368,912 | 271,925 | 645,469 | ||
| D | 329,963 | 235,361 | 582,478 | ||
| D | 284,480 | 204,067 | 538,615 | ||
| D | 324,004 | 183,035 | 614,187 | ||
| D | 348,814 | 231,137 | 586,151 | ||
| D | 372,576 | 284,692 | 665,748 | ||
| D | 297,464 | 271,850 | 621,418 | ||
| D | 328,343 | 303,127 | 647,857 | ||
| R | 282,496 | 371,737 | 668,535 | ||
| D | 364,906 | 264,790 | 713,817 | ||
| D | 475,207 | 241,707 | 719,725 | ||
| D | 428,455 | 320,970 | 750,718 | ||
| R | 315,989 | 384,939 | 702,030 | ||
| D | 370,945 | 359,224 | 733,072 | ||
| D | 326,303 | 253,272 | 594,506 | ||
| D | 350,690 | 261,218 | 614,301 | ||
| D | 367,926 | 263,285 | 634,198 | ||
| D | 366,593 | 176,224 | 562,194 | ||
| D | 189,839 | 152,326 | 359,003 | ||
| R | 160,733 | 215,626 | 379,209 | ||
| R | 21,984 | 149,296 | 253,013 | ||
| R | 40,278 | 138,908 | 200,716 | ||
| R | 52,833 | 77,483 | 140,264 | ||
| O | 31,417 | 23,822 | 126,386 | ||
| R | 35,655 | 74,080 | 121,905 | ||
| R | 21,541 | 90,594 | 118,405 | ||
| R | 27,311 | 71,780 | 102,624 | ||
| R | 29,809 | 76,691 | 108,174 | ||
| R | 30,867 | 45,788 | 78,504 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
22.3%
Irish
16.9%
Italian
14.5%
English
8.4%
Polish
7.6%
American
2.7%
Scottish
1.8%
African American
10.0%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
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.
2024 ACS
Age distribution by sex
Median age: 40.6 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.
2024 ACS
Median household income
Inflation-adjusted dollars
$78,548
Allegheny County ranks in the top 25% of US counties.
Allegheny County$78,548
Pennsylvania$77,971
United States$80,734
Allegheny County ranks in the top 25% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
11.5%
Child poverty is below the national average.
Children under 1814.9%
Working age (18–64)10.6%
Seniors (65+)11.7%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
91.5%
speak English only
Other Indo-European3.4%
Asian & Pacific Islander2.4%
Spanish1.9%
Other languages0.9%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 39.3% of residents not counted as adherents by any reporting body.
Allegheny County, Pennsylvania's second-most-populous, delivered a 20-point Democratic margin in 2024, making it one of the state's most decisive counterweights to rural Republican strongholds in statewide contests.
Once reliably Republican — a margin of fifty-eight points in 1904 at its widest — Allegheny County has trended Democratic. The 2024 margin was twenty points.
A median household income of $78,548 — among the higher at this geographic scale — and a population of 1,238,177 describe the county. The county's voting pattern over the last decade is most similar to that of District of Columbia and Jackson County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Allegheny County, Pennsylvania. Akashic. https://akashic.app/county/42003/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in Pennsylvania
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Frequently asked questions
How did Allegheny County, Pennsylvania vote in 2024?
In 2024, Allegheny County, Pennsylvania voted Democratic by 20.2 points (D+20), carried by the Democratic candidate. Out of 723,799 votes cast, 429,916 went Democratic and 283,595 went Republican.
What is Allegheny County, Pennsylvania's political typology?
Akashic places Allegheny County, Pennsylvania in the "Realigning Affluent Suburb" typology — College-educated, affluent suburbs — the one bloc moving toward the Democratic Party. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 22 times, Republican 11 times, and other 1 times.
When did Allegheny County, Pennsylvania last vote Republican?
The most recent presidential election in which Allegheny County, Pennsylvania voted Republican was 1972.
How many people live in Allegheny County, Pennsylvania?
Allegheny County, Pennsylvania has a population of 1,238,177 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Allegheny County, Pennsylvania?
Median household income in Allegheny County, Pennsylvania is $78,548 — below the national median of $80,734. The Pennsylvania state median is $77,971.
What is the political history of Allegheny County, Pennsylvania?
Akashic tracks 38 presidential elections in Allegheny County, Pennsylvania from 1876 to 2024. Of those, 22 went Democratic and 11 went Republican. The county's typology — "Realigning Affluent Suburb" — captures where that record, its demographics, and its recent swing place it among American communities.