Irmo, SC population, income and ZIP codes

Irmo town is a mid-size town in South Carolina, with 11,799 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #53 of 475 ranked by population — larger than 89% of them. The median age here is 39.5 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 Irmo town earn a median of $85,137 a year, 8.4% above the national figure of $78,538 and 60% above the $53,071 median for the 263 South Carolina 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 8.1% of residents here, below the 12.4% national rate.

The typical owner-occupied home in Irmo town is valued at $193,100, 36.4% below the national figure and 9% above the $177,100 peer median, while median gross rent runs $1,412 a month, essentially level with the national figure, or roughly $16,944 across a full year. A household on the local median income would put about 19.9% 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 2.3×, 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. 80.7% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. The rent line includes utilities paid by the tenant, a definition worth remembering when comparing it against a landlord's quoted rate.

No figure on this page is estimated by us; each one comes straight from the published ACS tables for this area. 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.