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New Castle County Delaware ☎ +1 302-395-5555 Last Updated: 07/17/2025 |
| 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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Delaware » New Castle County
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Delaware Place » City Delaware is a state located in the Mid-Atlantic region of the United States. It is the second smallest state in terms of both area and population, but it holds significant historical and economic importance. Delaware's most populous city is Wilmington, and the state's capital is Dover. Its population was 1,031,890 in 2023. 330 views 💖 1 👍 0The United States |