New Castle County, Delaware
New Castle County is a county in Delaware with an estimated population of 578,592 in 2023. 12 cities, towns and Census places in it are indexed here.
Largest places in New Castle County
Wilmington 71,675Newark 30,169Middletown 25,022Elsmere 6,157New Castle 5,549Townsend 2,832Delaware City 1,905Bellefonte 1,233Newport 896Arden 433Odessa 364Ardentown 254
About New Castle County
New Castle County is one of the counties of Delaware. County governments in Delaware handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.