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All New Castle County population data above are from the US Census Bureau.
The population data for New Castle County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Kent County, Kent County, Sussex County, and Sussex County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2017 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 559,335 people, New Castle County is the 1st most populated county in the state of Delaware out of 3 counties. But watch out, New Castle County, because Kent County with 178,550 people and Sussex County with 229,286 people are right behind you.
The largest New Castle County racial/ethnic groups are White (58.5%) followed by Black (24.1%) and Hispanic (9.6%).
In 2017, the median household income of New Castle County residents was $68,336. New Castle County households made slightly more than Kent County households ($57,647) and Sussex County households ($57,901) . However, 11.9% of New Castle County residents live in poverty.
The median age for New Castle County residents is 37.8 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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