New Castle ZIP codes — New Castle County, Delaware

New Castle County is a major city in Delaware, with 573,030 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates. The median age here is 39.2 years against 39.1 nationally, a slightly older profile than the country as a whole. At this size the Census also publishes one-year estimates; the five-year values used here are steadier and let you compare against smaller neighbours on the same basis.

Households in New Castle County earn a median of $89,901 a year, 14.5% above the national figure of $78,538. This figure covers the household, not the worker: two people on ordinary wages at one address outrank a single professional in the same table. Poverty reaches 10.2% of residents here, below the 12.4% national rate.

The typical owner-occupied home in New Castle County is valued at $329,800, 8.7% above the national figure, while median gross rent runs $1,379 a month, 1.9% below the national figure, or roughly $16,548 across a full year. A household on the local median income would put about 18.4% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 3.7×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 68.5% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. Gross rent folds in the utilities a tenant pays separately, so it is closer to the real monthly outlay than a headline rent figure.

All values below were released by the Census for this exact geography, with no gap-filling on our side. 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.