| ZIP Codes: | 18 ZIP Codes (14 Standard, 2 PO Box, 2 Unique) [See All] |
| Area Codes: | 309 / 861 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:04 PM |
| Population: | 132,535 [See All] |
| FIPS: | 17179 |
| CBSA: | Peoria, IL |
| Land Area: | 599 sq mi |
| Water Area: | 14 sq mi |
| Coordinates: | 40.5417, -89.4971 |
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132,535 residents live across 18 ZIPs covering 599 sq mi, served by 15 distinct USPS-recognized cities.
Population moved from 137,759 to 132,535 from 2014 to 2024 — a -3.8% change. 4 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 61535 (Groveland, $128,125 median) and poorest ZIP 61610 (Creve Coeur, $47,993) are 5.6 miles apart — a 2.7× income gap across local geography.
Median home values vary 2.9× across this county — from $85,500 in 61610 (Creve Coeur) to $246,700 in 61550 (Morton).
Density varies 56× across the county — from 32 people/sq mi in 61734 (Delavan) to 1,775 in 61564 (South Pekin).
Educational attainment ranges from 12.6% bachelor's+ in 61610 (Creve Coeur) to 45.2% in 61535 (Groveland) — the breadth of educational profiles across the area.
Within Illinois, this is the #15 most populous of 102 counties and ranks #15 for median household income .
Weighted by population, the typical household earns about $80,988 across the county — reflecting what a typical resident sees, not a simple ZIP average.
28.4% of adults age 25+ hold a bachelor's degree or higher (26,632 of 93,641 reporting).
14 Standard delivery, 2 PO Box only, 2 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61554 | Pekin | Standard | 40,577 | $65,194 | 83.4 | -7.1% |
| 61571 | Washington | Standard | 24,470 | $90,386 | 53.4 | 1.3% |
| 61611 | East Peoria | Standard | 24,040 | $78,750 | 49.8 | -5.7% |
| 61550 | Morton | Standard | 18,792 | $98,516 | 41.7 | 6.0% |
| 61610 | Creve Coeur | Standard | 4,621 | $47,993 | 4.4 | -19.2% |
| 61568 | Tremont | Standard | 4,483 | $100,972 | 65.2 | 1.4% |
| 61755 | Mackinaw | Standard | 4,364 | $102,225 | 47.6 | -7.3% |
| 61734 | Delavan | Standard | 2,443 | $71,435 | 76.6 | -15.2% |
| 61535 | Groveland | Standard | 1,748 | $128,125 | 7.4 | 31.3% |
| 61534 | Green Valley | Standard | 1,725 | $90,104 | 51.5 | -0.8% |
| 61747 | Hopedale | Standard | 1,441 | $80,333 | 27.0 | -9.0% |
| 61759 | Minier | Standard | 1,359 | $91,591 | 34.5 | -14.8% |
| 61733 | Deer Creek | Standard | 984 | $98,281 | 22.5 | -1.4% |
| 61564 | South Pekin | PO Box | 936 | $75,100 | 0.5 | -14.4% |
| 61721 | Armington | Standard | 552 | $91,500 | 32.7 | -12.2% |
| 61635 | East Peoria | Unique | — | — | 0.3 | — |
| 61558 | Pekin | Unique | — | — | 0.0 | — |
| 61555 | Pekin | PO Box | — | — | 0.0 | — |