New Castle County, DE Population

Overview

567,769

Total Population

38.8

Median age

51.32%

Female population %

94.8:100

Gender ratio (M:F)

30-34 years

Largest age group

50.3

Total dependency ratio

White

Largest racial group

59,765

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

New Castle County's population is old compared to the rest of the country:

The median age in New Castle County is 38.8, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
New Castle County's population under 18 was 21.60%, compared to the 22.51% nationwide.
New Castle County's elderly or the senior population (over 65 age) was 15.72% as compared to 16.04% nationwide.
Of the total population in New Castle County, 17.76% were under the age of 15, 20.04% aged 15 to 29, 46.48% aged 30 to 64, 13.89% aged 65 to 84, and 1.83% were 85 years of age and older.

There are 15,031 more females than males in New Castle County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 51.32% females and 48.68% males in New Castle County, DE.
The New Castle County, DE gender ratio is 94.8:100 i.e. 94.8 men to 100 women (0.948).
For male population, the largest age group is 30-34 years with a population of 20,281.
For the female population, the largest age group is 60-64 years with a population of 20,700.

New Castle County's population has become increasingly diverse:

Racial distribution of New Castle County population: 60.80% are White, 25.23% are Black or African American, 0.20% are American Indian and Alaska Native, 5.79% are Asian, 0.04% are Native Hawaiian and other Pacific Islander, 3.18% are some other race and 4.76% are multiracial.
New Castle County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 59,765 is Hispanic or Latino (of any race), and 508,004 (89.47% of the total population) is Non-Hispanic.
The largest racial group in New Castle County is White with a population of 345,223 (60.80% of the total population).

New Castle County's population has not reached its peak yet and is showing a trend of further growth:

The peak population was 575,494 in the year 2022
From 2000 to 2010, New Castle County's population increased by 36,854 (7.34%), as compared to the national growth of 9.63%.
From 2010 to 2020, New Castle County's population increased by 32,081 (5.95%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, New Castle County's population was lowest in year 2000 at 501,938.