With 5,579 people, New Castle is a city in Delaware. At a median age of 48.5, this is an older place than the country as a whole. The poverty rate is 4.7%, under the national 12.5%. Density works out to 1,604 people per square mile. The population is up 15% since 2000. Home values have more than doubled since 2000, reaching $285,100.
At a glance
Wealthier
median household income $89,205, above the US median
US median: $82,259
Older
median age 48.5
US median: 38.9
Average education
34% hold a bachelor's degree
US average: 36%
Less affordable
home values up 29%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about New Castle
What changed most since 1990
Black share16.6% → 28.4%(+11.9 pts)US over the same years: +0.2 pts
Homes owned by their occupants73.4% → 63.4%(−10.0 pts)US over the same years: +0.9 pts
Median age36.1 → 48.5(+12.4 years)US over the same years: +6.0 years
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)28.8%(75)
US avg: 26.4%
Gulf War (1990s)4.6%(12)
US avg: 24.3%
Vietnam era21.5%(56)
US avg: 33.1%
Korean War5%(13)
US avg: 4.5%
World War II2.7%(7)
US avg: 1%
Share of the 260 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
New Castle, decade by decade
New Castle population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
4,837
$88,303
$221,046
16.5%
40.0
2000
4,862
$95,544
$221,513
26.4%
47.2
2010
5,285
$82,995
$317,349
32.3%
63.4
2020
5,551
$88,419
$256,589
29.4%
71.4
2024
5,579
$89,205
$285,100
33.8%
68.4
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
