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New Castle County Delaware ☎ +1 302-395-5555 Last Updated: 10/05/2026 |
| New Castle County is the northernmost of the three counties of the U.S. state of Delaware (New Castle, Kent, and Sussex). As of the 2020 census, the population was 570,719, making it the most populous county in Delaware, with nearly 60% of the state's population of 989,948. The county seat is Wilmington, which is also the state's most populous city. | |
| New Castle is known for its thriving historic downtown, outdoor open spaces and recreation including Battery Park, multiple playgrounds, trails, nature areas. | |
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