New Castle County, Delaware: Diversifying Metro county. In 2024, voted D+33%. Democratic peak: D+41 in 2008.
Key facts
- 2024 presidential margin
- D+33MIT Election Lab
- Political typology
- Diversifying MetroAkashic typology
- Population
- 577,9612024 5-year
- Median household income
- $91,1662024 5-year
- White (non-Hispanic)
- 54.2%2024 5-year
- Black
- 25.6%2024 5-year
- Hispanic / Latino
- 11.8%2024 5-year
- Peak Democratic margin
- D+41 in 2008MIT Election Lab
- Peak Republican margin
- R+36 in 1928MIT Election Lab
- Most similar
- Ingham County, MI · similarity 1.00
2024 results by precinct
2024 precinct map of New Castle CountyPrecinct-level 2024 presidential results for New Castle 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 | No data |
| 1896 | No data |
| 1900 | No data |
| 1904 | No data |
| 1908 | −7.0% |
| 1912 | +15.9% |
| 1916 | −4.0% |
| 1920 | −19.7% |
| 1924 | −30.4% |
| 1928 | −35.8% |
| 1932 | −9.4% |
| 1936 | +11.0% |
| 1940 | +11.4% |
| 1944 | +13.5% |
| 1948 | +0.7% |
| 1952 | −3.5% |
| 1956 | −11.5% |
| 1960 | +2.9% |
| 1964 | +25.2% |
| 1968 | −1.0% |
| 1972 | −17.6% |
| 1976 | +4.4% |
| 1980 | −0.0% |
| 1984 | −14.6% |
| 1988 | −7.8% |
| 1992 | +12.8% |
| 1996 | +21.1% |
| 2000 | +23.0% |
| 2004 | +22.0% |
| 2008 | +40.6% |
| 2012 | +34.1% |
| 2016 | +29.6% |
| 2020 | +37.1% |
| 2024 | +32.6% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 180,568 | 90,768 | 275,160 | ||
| D | 195,034 | 88,364 | 287,633 | ||
| D | 162,919 | 85,525 | 261,507 | ||
| D | 167,082 | 81,230 | 251,996 | ||
| D | 178,768 | 74,608 | 256,417 | ||
| D | 146,179 | 93,079 | 241,527 | ||
| D | 127,539 | 78,587 | 213,060 | ||
| D | 98,837 | 60,943 | 179,546 | ||
| D | 91,516 | 66,311 | 196,817 | ||
| R | 79,147 | 92,587 | 173,003 | ||
| R | 76,238 | 102,322 | 179,077 | ||
| R | 76,897 | 76,898 | 168,427 | ||
| D | 87,521 | 80,074 | 170,338 | ||
| R | 70,190 | 100,681 | 172,956 | ||
| R | 68,468 | 70,014 | 156,413 | ||
| D | 91,752 | 54,767 | 146,893 | ||
| D | 73,364 | 69,284 | 142,974 | ||
| R | 56,405 | 71,133 | 127,813 | ||
| R | 58,387 | 62,658 | 121,396 | ||
| D | 48,117 | 47,451 | 97,001 | ||
| D | 49,588 | 37,783 | 87,689 | ||
| D | 52,167 | 41,508 | 93,675 | ||
| D | 47,315 | 37,851 | 85,766 | ||
| R | 32,872 | 39,844 | 74,109 | ||
| R | 22,464 | 47,641 | 70,412 | ||
| R | 17,842 | 35,427 | 57,851 | ||
| R | 24,252 | 36,600 | 62,791 | ||
| R | 14,894 | 16,166 | 31,976 | ||
| D | 13,009 | 8,340 | 29,384 | ||
| R | 12,964 | 14,979 | 28,644 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
Irish
14.8%
German
11.7%
Italian
9.6%
English
9.2%
Polish
4.5%
American
3.2%
Scottish
1.5%
African American
20.5%
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: 39.3 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
$91,166
New Castle County ranks in the top 10% of US counties.
New Castle County$91,166
Delaware$84,954
United States$80,734
New Castle 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
10.1%
Child poverty is below the national average.
Children under 1813.7%
Working age (18–64)9.2%
Seniors (65+)8.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
82.7%
speak English only
Spanish8.3%
Other Indo-European3.9%
Asian & Pacific Islander3.1%
Other languages2.0%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 52.7% of residents not counted as adherents by any reporting body.
Home to Wilmington and the state's densest urban corridor, New Castle generates enough Democratic margin to effectively determine statewide outcomes on its own, routinely outweighing the two smaller, more competitive downstate counties combined.
The Democratic margin here reached forty-one points in 2008. Between 2020 and 2024 the county moved four points toward the Republican candidate; the 2024 margin was thirty-three points.
A population of 577,961, a 54% non-Hispanic-white share, and a median household income of $91,166 describe the county. The county's voting pattern over the last decade is most similar to that of Ingham County and Onondaga 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.
New Castle County, Delaware. Akashic. https://akashic.app/county/10003/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in Delaware
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Frequently asked questions
How did New Castle County, Delaware vote in 2024?
In 2024, New Castle County, Delaware voted Democratic by 32.6 points (D+33), carried by the Democratic candidate. Out of 275,160 votes cast, 180,568 went Democratic and 90,768 went Republican.
What is New Castle County, Delaware's political typology?
Akashic places New Castle County, Delaware 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 17 times, Republican 13 times, and other 0 times.
When did New Castle County, Delaware last vote Republican?
The most recent presidential election in which New Castle County, Delaware voted Republican was 1988.
How many people live in New Castle County, Delaware?
New Castle County, Delaware has a population of 577,961 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in New Castle County, Delaware?
Median household income in New Castle County, Delaware is $91,166 — above the national median of $80,734. The Delaware state median is $84,954.
What is the political history of New Castle County, Delaware?
Akashic tracks 38 presidential elections in New Castle County, Delaware from 1876 to 2024. Of those, 17 went Democratic and 13 went Republican. The county's typology — "Diversifying Metro" — captures where that record, its demographics, and its recent swing place it among American communities.