DeKalb ZIP codes — DeKalb County, Illinois

DeKalb County is a mid-size city in Illinois, with 100,512 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates. The median age here is 32.6 years against 39.1 nationally, a distinctly younger profile, typical of places with students, military posts or a fast-growing family population. 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 DeKalb County earn a median of $69,022 a year, 12.1% below the national figure of $78,538. Household income here is measured before tax and pooled across everyone at the address, which is why it reads higher than typical individual earnings in the same area. Poverty reaches 15.9% of residents here, above the 12.4% national rate.

The typical owner-occupied home in DeKalb County is valued at $231,900, 23.6% below the national figure, while median gross rent runs $1,041 a month, 26% below the national figure, or roughly $12,492 across a full year. A household on the local median income would put about 18.1% 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 3.4×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 60.9% 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.