Cost of living in New Castle, DE

New Castle is a Census city in New Castle County, DE. ACS 2024 5-year population is 5,579. Median gross rent is $1,739 (ACS 2024 5-year, this place). Median home value is $285,100. Median household income is $89,205. Insurance is the NAIC state average; food is a USDA plan — no town indexes.