New Castle County Flag

New Castle County

State:
Delaware
County Seat:
Wilmington

New Castle County's estimated 2025 population is 585,268 with a growth rate of 0.57% in the past year according to the most recent United States census data. New Castle County is the  largest county in Delaware. The 2010 population was 538,792 and has seen a growth of 8.63% since that time.

585,268
Total Population
1,374
Population Density (miĀ²)
1
Population Rank (State)
3.3K 0.57%
Annual Population Growth

New Castle County Population

New Castle County Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of New Castle County includes 56.48% White, 25.28% Black or African American, 5.93% Asian, 4.68% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Race
Population
Percentage (of total)
White323,64256.48%
Black or African American144,85025.28%
Two or more races42,3677.39%
Asian33,9535.93%
Other race26,8234.68%
Native American1,1770.21%
Native Hawaiian or Pacific Islander2180.04%

New Castle County Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

New Castle County's average per capita income is $57,648. Household income levels show a median of $89,901. The poverty rate stands at 10.2%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$134,580$162,092
Families$112,402$140,270
Households$89,901$118,003
Non Families$54,382$71,246

$57,648

Average Income

$89,901

Median Household Income

10.2%

Poverty Rate