| ZIP Codes: | 9 ZIP Codes (8 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:03 PM |
| Population: | 5,642 [See All] |
| FIPS: | 17153 |
| Land Area: | 210 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 37.2137, -89.1173 |
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5,642 residents live across 9 ZIPs covering 210 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 6,251 to 5,642 from 2014 to 2024 — a -9.7% change. 3 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 62956 (Karnak, $73,462 median) and poorest ZIP 62964 (Mounds, $31,833) are 16.0 miles apart — a 2.3× income gap across local geography.
Median home values vary 2.6× across this county — from $52,900 in 62963 (Mound City) to $139,400 in 62941 (Grand Chain).
Density varies 13× across the county — from 15 people/sq mi in 62992 (Ullin) to 193 in 62963 (Mound City).
Educational attainment ranges from 0.7% bachelor's+ in 62963 (Mound City) to 21.5% in 62956 (Karnak) — the breadth of educational profiles across the area.
Within Illinois, this is the #96 most populous of 102 counties and ranks #100 for median household income .
Weighted by population, the typical household earns about $51,596 across the county — reflecting what a typical resident sees, not a simple ZIP average.
13.6% of adults age 25+ hold a bachelor's degree or higher (535 of 3,925 reporting).
8 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62956 | Karnak | Standard | 1,172 | $73,462 | 23.0 | 29.8% |
| 62964 | Mounds | Standard | 1,109 | $31,833 | 26.6 | -29.0% |
| 62963 | Mound City | Standard | 713 | $54,531 | 3.7 | 18.2% |
| 62941 | Grand Chain | Standard | 639 | $47,500 | 34.8 | -15.8% |
| 62992 | Ullin | Standard | 629 | $62,688 | 43.0 | -14.4% |
| 62996 | Villa Ridge | Standard | 523 | $56,122 | 28.7 | 22.5% |
| 62970 | Olmsted | Standard | 465 | $34,313 | 29.2 | -46.4% |
| 62976 | Pulaski | Standard | 392 | $40,139 | 21.4 | -1.0% |
| 62973 | Perks | PO Box | — | — | 0.0 | — |