| ZIP Codes: | 9 ZIP Codes (7 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 309 / 779 / 815 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:02 PM |
| Population: | 12,402 [See All] |
| FIPS: | 17123 |
| CBSA: | Peoria, IL |
| Land Area: | 392 sq mi |
| Water Area: | 16 sq mi |
| Coordinates: | 41.0233, -89.3322 |
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12,402 residents live across 9 ZIPs covering 392 sq mi, served by 9 distinct USPS-recognized cities.
Population moved from 13,498 to 12,402 from 2014 to 2024 — a -8.1% change. 2 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 61375 (Varna, $81,293 median) and poorest ZIP 61541 (La Rose, $41,875) are 3.1 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.3× across this county — from $72,900 in 61541 (La Rose) to $164,900 in 61375 (Varna).
Density varies 27× across the county — from 19 people/sq mi in 61565 (Sparland) to 518 in 61541 (La Rose).
Educational attainment ranges from 2.6% bachelor's+ in 61541 (La Rose) to 24.0% in 61565 (Sparland) — the breadth of educational profiles across the area.
Within Illinois, this is the #83 most populous of 102 counties and ranks #66 for median household income .
Weighted by population, the typical household earns about $71,389 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.8% of adults age 25+ hold a bachelor's degree or higher (1,617 of 9,078 reporting).
7 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61540 | Lacon | Standard | 2,753 | $78,824 | 57.7 | 2.5% |
| 61537 | Henry | Standard | 2,743 | $67,404 | 57.6 | -1.4% |
| 61369 | Toluca | Standard | 1,594 | $68,708 | 43.8 | 2.5% |
| 61570 | Washburn | Standard | 1,503 | $71,563 | 69.3 | -15.2% |
| 61377 | Wenona | Standard | 1,441 | $57,321 | 52.6 | -14.3% |
| 61565 | Sparland | Standard | 1,262 | $77,578 | 65.1 | -23.8% |
| 61375 | Varna | Standard | 989 | $81,293 | 45.5 | -12.9% |
| 61541 | La Rose | PO Box | 97 | $41,875 | 0.2 | -24.8% |
| 61424 | Camp Grove | PO Box | 20 | — | 0.0 | -80.2% |