South Beloit, IL population, income and ZIP codes

South Beloit city is a mid-size town in Illinois, with 7,930 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #267 of 1,462 ranked by population — larger than 81% of them. The median age here is 35.7 years against 39.1 nationally, a slightly younger 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 South Beloit city earn a median of $81,836 a year, 4.2% above the national figure of $78,538 and 10% 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 8.6% of residents here, below the 12.4% national rate.

The typical owner-occupied home in South Beloit city is valued at $160,800, 47% below the national figure and 10% below the $179,100 peer median, while median gross rent runs $925 a month, 34.2% below the national figure, or roughly $11,100 across a full year. A household on the local median income would put about 13.6% 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×, 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. 70.4% of occupied homes are owner-occupied versus 65% nationally, so the market leans toward owners. The rent line includes utilities paid by the tenant, a definition worth remembering when comparing it against a landlord's quoted rate.

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.