Oak Forest, IL population, income and ZIP codes

Oak Forest city is a small city in Illinois, with 26,888 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #79 of 1,462 ranked by population — larger than 94% of them. The median age here is 40.3 years against 39.1 nationally, a slightly older profile than the country as a whole. 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 Oak Forest city earn a median of $87,941 a year, 12% above the national figure of $78,538 and 18% above the $74,244 median for the 698 Illinois 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 5.4% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Oak Forest city is valued at $247,800, 18.3% below the national figure and 38% above the $179,100 peer median, while median gross rent runs $1,287 a month, 8.5% below the national figure, or roughly $15,444 across a full year. A household on the local median income would put about 17.6% 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 2.8×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 79.6% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

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.