New Castle County, Delaware
Located in Delaware, New Castle County has a population of 577,961 residents and a median age of 39.3 years, making it the #122 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 10.1%. The median home value is $352,200, and the median household income is $91,166, which is 21% above the national median.
Demographics
New Castle County has a population of 577,961, making it the #122 most populous county in the US. The median age is 39.3 years, which is 1.0% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in New Castle County is $91,166, ranking #278 out of 3,222 counties — 21.3% above the national median. The poverty rate is 10.1% and unemployment stands at 4.8%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in New Castle County is $352,200 (+24.9% vs national). Renters pay a median of $1,448/mo and the homeownership rate is 69.0%.
Median Home Value Trend
Rankings →Household Type
Education
In New Castle County, 39.7% of adults age 25+ hold a bachelor's degree or higher, which is 17.8% above the national average, ranking #290 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in New Castle County is 77.1 years. 16.1% of adults report poor or fair health and 6.2% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
14.2% of adults in New Castle County smoke , 37.6% are obese , and 18.0% report excessive drinking. The drug overdose death rate is 52.3 per 100,000.
Adult Smoking Trend
Safety
The homicide rate in New Castle County is 8.9 per 100,000 and the suicide rate is 11.6 per 100,000. Motor vehicle deaths occur at a rate of 11.2 per 100,000.
Homicide Rate Trend
Families & Children
14.6% of children in New Castle County live in poverty and the infant mortality rate is 6.9 per 1,000 live births. The teen birth rate is 11.9 per 1,000 females age 15–19.
Infant Mortality Trend
Civic & Transportation
Voter turnout in New Castle County is 70.1%. The mean commute time is 27.8 min, which is 0.6% above the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, New Castle County voted Democratic with a margin of 32.6%. The vote was 65.5% Dem / 32.9% Rep. Compared to 2020, the margin shifted 4.5 toward Republicans .
Vote Share Over Time
About New Castle County, Delaware
New Castle County, Delaware has a total population of 577,961, making it the 122nd most populous county in the United States. The median age in New Castle County is 39.3 years, which is 1.0% above the national median of 38.9 years.
The median household income in New Castle County is $91,166, which ranks #278 of 3,222 counties nationwide. This is 21.3% above the national median of $75,149. The poverty rate is 10.1%, lower than the national rate of 12.6%. The unemployment rate stands at 4.8%.
The median home value in New Castle County is $352,200, 24.9% above the national median. Renters in New Castle County pay a median gross rent of $1,448 per month. The homeownership rate is 69.0%, compared to the national rate of 64.4%.
In New Castle County, 39.7% of residents aged 25 and older hold a bachelor's degree or higher, 17.8% above the national average of 33.7%. Health insurance coverage stands at 94.1% of the population. The average commute time for workers is 27.8 min.
New Castle County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 52.3% of the population, followed by Black (non-Hispanic) (24.9%) and Hispanic or Latino (11.8%).
All data for New Castle County, Delaware comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.