Delaware County, Pennsylvania: Diversifying Metro county. In 2024, voted D+24%. Republican peak: R+69 in 1924.
Key facts
- 2024 presidential margin
- D+24MIT Election Lab
- Political typology
- Diversifying MetroAkashic typology
- Population
- 579,2222024 5-year
- Median household income
- $89,5462024 5-year
- White (non-Hispanic)
- 63.2%2024 5-year
- Black
- 22.2%2024 5-year
- Hispanic / Latino
- 5.0%2024 5-year
- Peak Democratic margin
- D+27 in 2020MIT Election Lab
- Peak Republican margin
- R+69 in 1924MIT Election Lab
- Most similar
- Montgomery County, PA · similarity 0.99
2024 results by precinct
2024 precinct map of Delaware CountyPrecinct-level 2024 presidential results for Delaware 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 | −24.6% |
| 1896 | −52.8% |
| 1900 | −51.9% |
| 1904 | −59.5% |
| 1908 | −44.1% |
| 1912 | −10.4% |
| 1916 | −34.7% |
| 1920 | −54.1% |
| 1924 | −69.4% |
| 1928 | −47.6% |
| 1932 | −38.8% |
| 1936 | −6.8% |
| 1940 | −14.1% |
| 1944 | −10.1% |
| 1948 | −23.6% |
| 1952 | −23.5% |
| 1956 | −27.2% |
| 1960 | −4.2% |
| 1964 | +13.9% |
| 1968 | −10.2% |
| 1972 | −29.6% |
| 1976 | −11.6% |
| 1980 | −21.4% |
| 1984 | −24.3% |
| 1988 | −20.9% |
| 1992 | +1.0% |
| 1996 | +9.9% |
| 2000 | +11.7% |
| 2004 | +14.8% |
| 2008 | +21.4% |
| 2012 | +21.3% |
| 2016 | +22.3% |
| 2020 | +26.8% |
| 2024 | +23.7% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 201,324 | 123,421 | 329,215 | ||
| D | 206,423 | 118,532 | 327,931 | ||
| D | 177,402 | 110,667 | 299,336 | ||
| D | 171,792 | 110,853 | 285,564 | ||
| D | 178,870 | 115,273 | 297,004 | ||
| D | 162,601 | 120,425 | 284,538 | ||
| D | 134,861 | 105,836 | 248,077 | ||
| D | 115,946 | 92,628 | 234,748 | ||
| D | 111,210 | 108,587 | 266,074 | ||
| R | 96,144 | 147,656 | 246,305 | ||
| R | 98,207 | 161,754 | 261,782 | ||
| R | 88,314 | 143,282 | 256,859 | ||
| R | 117,252 | 148,679 | 270,894 | ||
| R | 94,144 | 175,414 | 274,451 | ||
| R | 106,695 | 133,777 | 266,436 | ||
| D | 147,189 | 111,189 | 259,095 | ||
| R | 124,629 | 135,672 | 260,783 | ||
| R | 82,024 | 143,663 | 226,210 | ||
| R | 80,316 | 129,743 | 210,748 | ||
| R | 57,156 | 93,412 | 153,315 | ||
| R | 64,021 | 78,533 | 143,309 | ||
| R | 60,225 | 80,158 | 140,932 | ||
| R | 65,117 | 74,899 | 143,013 | ||
| R | 32,413 | 75,291 | 110,409 | ||
| R | 29,378 | 83,092 | 112,941 | ||
| R | 6,368 | 41,998 | 51,345 | ||
| R | 9,602 | 34,126 | 45,293 | ||
| R | 7,742 | 16,315 | 24,734 | ||
| O | 6,001 | 8,418 | 23,238 | ||
| R | 5,727 | 15,184 | 21,461 | ||
| R | 3,586 | 15,032 | 19,236 | ||
| R | 4,249 | 13,794 | 18,401 | ||
| R | 4,169 | 13,979 | 18,572 | ||
| R | 5,520 | 9,272 | 15,269 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
Irish
22.2%
Italian
14.4%
German
11.8%
English
7.7%
Polish
3.5%
American
2.7%
Scottish
1.4%
African American
17.8%
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: 39.1 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
$89,546
Delaware County ranks in the top 10% of US counties.
Delaware County$89,546
Pennsylvania$77,971
United States$80,734
Delaware County ranks in the top 10% 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
10.2%
Child poverty is below the national average.
Children under 1813.2%
Working age (18–64)9.2%
Seniors (65+)10.5%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
86.5%
speak English only
Other Indo-European4.7%
Asian & Pacific Islander3.9%
Spanish3.0%
Other languages1.9%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 50.0% of residents not counted as adherents by any reporting body.
Delaware County shifted from a longtime Republican stronghold to reliably Democratic territory over the past decade, driven by suburban realignment among college-educated voters. Its 2024 margin of D+23.7 reflects one of the sharpest reversals in Pennsylvania's collar counties.
The Democratic margin here reached twenty-seven points in 2020. Between 2020 and 2024 the county moved three points toward the Republican candidate; the 2024 margin was twenty-four points.
A population of 579,222, a 63% non-Hispanic-white share, and a median household income of $89,546 describe the county. The county's voting pattern over the last decade is most similar to that of Montgomery County and Clayton 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.
Delaware County, Pennsylvania. Akashic. https://akashic.app/county/42045/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in Pennsylvania
More diversifying metro counties
Frequently asked questions
How did Delaware County, Pennsylvania vote in 2024?
In 2024, Delaware County, Pennsylvania voted Democratic by 23.7 points (D+24), carried by the Democratic candidate. Out of 329,215 votes cast, 201,324 went Democratic and 123,421 went Republican.
What is Delaware County, Pennsylvania's political typology?
Akashic places Delaware County, Pennsylvania in the "Diversifying Metro" typology — Mid-size metropolitan counties growing more diverse and trending Democratic. 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 10 times, Republican 23 times, and other 1 times.
When did Delaware County, Pennsylvania last vote Republican?
The most recent presidential election in which Delaware County, Pennsylvania voted Republican was 1988.
How many people live in Delaware County, Pennsylvania?
Delaware County, Pennsylvania has a population of 579,222 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Delaware County, Pennsylvania?
Median household income in Delaware County, Pennsylvania is $89,546 — above the national median of $80,734. The Pennsylvania state median is $77,971.
What is the political history of Delaware County, Pennsylvania?
Akashic tracks 38 presidential elections in Delaware County, Pennsylvania from 1876 to 2024. Of those, 10 went Democratic and 23 went Republican. The county's typology — "Diversifying Metro" — captures where that record, its demographics, and its recent swing place it among American communities.