New Castle, DE population, income and ZIP codes

New Castle city is a mid-size town in Delaware, with 5,519 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #21 of 79 ranked by population — larger than 74% of them. The median age here is 46.4 years against 39.1 nationally, a markedly older profile that usually tracks retirees staying put and younger households leaving for work. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in New Castle city earn a median of $92,565 a year, 17.9% above the national figure of $78,538 and 23% above the $75,000 median for the 54 Delaware cities we cover. Median household income counts every pre-tax dollar arriving at an address — wages, self-employment, Social Security, pensions, interest and public assistance — for everyone living there, so multi-earner households pull the figure up even where individual pay is modest. Poverty reaches 3.4% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in New Castle city is valued at $262,100, 13.6% below the national figure and 6% below the $280,200 peer median, while median gross rent runs $1,675 a month, 19.1% above the national figure, or roughly $20,100 across a full year. A household on the local median income would put about 21.7% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is within the standard affordability guideline. The home-price-to-income ratio works out to 2.8×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 63.5% of occupied homes are owner-occupied versus 65% nationally, so the market leans more heavily on renters. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

Every value on this page is published directly by the Census for this area — nothing is modelled or interpolated. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.