Rock City, IL population, income and ZIP codes

Rock City village is a very small community in Illinois, with 378 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #1016 of 1,462 ranked by population — larger than 30% of them. The median age here is 32.2 years against 39.1 nationally, a distinctly younger profile, typical of places with students, military posts or a fast-growing family population. At this population the ACS sample is small, so the margin of error around every dollar figure below is wide — treat the numbers as a band, not a point, and expect them to move between annual releases without the place itself changing.

Households in Rock City village earn a median of $70,000 a year, 10.9% below the national figure of $78,538 and 6% below the $74,244 median for the 698 Illinois cities we cover. 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 4.5% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Rock City village is valued at $124,000, 59.1% below the national figure and 31% below the $179,100 peer median, while median gross rent runs $845 a month, 39.9% below the national figure, or roughly $10,140 across a full year. A household on the local median income would put about 14.5% 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 1.8×, against roughly 3.9× nationally, so purchase prices are unusually low against local pay, the pattern in places where supply is plentiful and wage growth has been flat. 79.2% 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.

With 378 residents, a handful of survey responses moves every median on this page. Compare Rock City village against its county rather than against national figures.

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.