| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 217 / 447 / 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:16 PM |
| Population: | 17,365 [See All] |
| FIPS: | 17005 |
| CBSA: | St. Louis, MO-IL |
| Land Area: | 385 sq mi |
| Water Area: | 2 sq mi |
| Coordinates: | 38.8744, -89.4566 |
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17,365 residents live across 6 ZIPs covering 385 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 18,015 to 17,365 from 2014 to 2024 — a -3.6% change. 2 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 62275 (Pocahontas, $85,000 median) and poorest ZIP 62273 (Pierron, $51,000) are 2.7 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.1× across this county — from $101,500 in 62273 (Pierron) to $209,400 in 62275 (Pocahontas).
Density varies 393× across the county — from 28 people/sq mi in 62284 (Smithboro) to 11,051 in 62273 (Pierron).
Educational attainment ranges from 4.4% bachelor's+ in 62284 (Smithboro) to 27.6% in 62246 (Greenville) — the breadth of educational profiles across the area.
Within Illinois, this is the #59 most populous of 102 counties and ranks #80 for median household income .
Weighted by population, the typical household earns about $68,858 across the county — reflecting what a typical resident sees, not a simple ZIP average.
22.5% of adults age 25+ hold a bachelor's degree or higher (2,690 of 11,959 reporting).
5 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 |
|---|---|---|---|---|---|---|
| 62246 | Greenville | Standard | 10,077 | $66,970 | 147.3 | -0.7% |
| 62275 | Pocahontas | Standard | 3,012 | $85,000 | 102.4 | -12.3% |
| 62262 | Mulberry Grove | Standard | 1,967 | $65,089 | 65.6 | 7.3% |
| 62086 | Sorento | Standard | 1,318 | $65,000 | 45.7 | -14.6% |
| 62284 | Smithboro | Standard | 686 | $51,875 | 24.4 | 16.9% |
| 62273 | Pierron | PO Box | 305 | $51,000 | 0.0 | -35.2% |