| ZIP Codes: | 5 ZIP Codes (4 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:03 PM |
| Population: | 19,868 [See All] |
| FIPS: | 17145 |
| Land Area: | 365 sq mi |
| Water Area: | 5 sq mi |
| Coordinates: | 38.0501, -89.4196 |
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19,868 residents live across 5 ZIPs covering 365 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 20,691 to 19,868 from 2014 to 2024 — a -4.0% change. 1 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 62274 (Pinckneyville, $71,658 median) and poorest ZIP 62997 (Willisville, $54,318) are 9.9 miles apart — a 1.3× income gap across local geography.
Median home values vary 2.1× across this county — from $61,900 in 62997 (Willisville) to $131,500 in 62274 (Pinckneyville).
Density varies 2742× across the county — from 13 people/sq mi in 62238 (Cutler) to 35,732 in 62997 (Willisville).
Educational attainment ranges from 5.9% bachelor's+ in 62997 (Willisville) to 15.3% in 62832 (Du Quoin) — the breadth of educational profiles across the area.
Within Illinois, this is the #56 most populous of 102 counties and ranks #82 for median household income .
Weighted by population, the typical household earns about $65,187 across the county — reflecting what a typical resident sees, not a simple ZIP average.
13.8% of adults age 25+ hold a bachelor's degree or higher (1,970 of 14,327 reporting).
4 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.