| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 309 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:03 PM |
| Population: | 5,737 [See All] |
| FIPS: | 17175 |
| CBSA: | Peoria, IL |
| Land Area: | 342 sq mi |
| Water Area: | 0 sq mi |
| Coordinates: | 41.0894, -89.7573 |
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5,737 residents live across 6 ZIPs covering 342 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 6,449 to 5,737 from 2014 to 2024 — a -11.0% change. 0 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 61479 (Speer, $135,313 median) and poorest ZIP 61449 (La Fayette, $51,635) are 18.5 miles apart — a 2.6× income gap across local geography.
Median home values vary 3.1× across this county — from $66,100 in 61449 (La Fayette) to $205,300 in 61479 (Speer).
Density varies 2× across the county — from 9 people/sq mi in 61479 (Speer) to 21 in 61491 (Wyoming).
Educational attainment ranges from 12.1% bachelor's+ in 61449 (La Fayette) to 38.5% in 61479 (Speer) — the breadth of educational profiles across the area.
Within Illinois, this is the #93 most populous of 102 counties and ranks #39 for median household income .
Weighted by population, the typical household earns about $64,123 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 (927 of 4,123 reporting).
5 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.