| ZIP Codes: | 4 ZIP Codes (2 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:21 PM |
| Population: | 10,905 [See All] |
| FIPS: | 17185 |
| Land Area: | 194 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 38.4165, -87.8343 |
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10,905 residents live across 4 ZIPs covering 194 sq mi, served by 4 distinct USPS-recognized cities.
Population moved from 11,270 to 10,905 from 2014 to 2024 — a -3.2% change. 2 ZIPs gained residents, 2 lost.
The county's wealthiest ZIP 62410 (Allendale, $80,588 median) and poorest ZIP 62811 (Bellmont, $52,083) are 14.1 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.4× across this county — from $47,300 in 62811 (Bellmont) to $113,400 in 62410 (Allendale).
Density varies 375× across the county — from 31 people/sq mi in 62410 (Allendale) to 11,667 in 62852 (Keensburg).
Educational attainment ranges from 1.2% bachelor's+ in 62811 (Bellmont) to 19.5% in 62863 (Mount Carmel) — the breadth of educational profiles across the area.
Within Illinois, this is the #86 most populous of 102 counties and ranks #77 for median household income .
Weighted by population, the typical household earns about $58,696 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.5% of adults age 25+ hold a bachelor's degree or higher (1,406 of 7,594 reporting).
2 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.