Peoria County, Illinois
County seat: Peoria · Population 178,553 (2025) · 619 sq mi
Peoria County is the 12th most populous of Illinois's 102 counties, with 178,553 people (2025 estimate). Its county seat is Peoria. It is part of the North Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 17 cities and towns and the 6 neighboring counties.
Peoria County facts
- County seat
- Peoria
- Population (2025 estimate)
- 178,553 −1.9% since 2020
- Land area
- 619 sq mi 32nd largest of 102
- Water area
- 12 sq mi
- Population density
- 289 per sq mi
- Established
- 1825
- Named after
- Peoria Tribe federally recognized Native American Nation
- Largest city
- Peoria 110,920
- Median household income
- $65,108
- Cities and towns
- 17 plus 5 CDPs
- ZIP codes
- 28
- Time zone
- Central
- FIPS code
- 17143
Cities and towns in Peoria County
Peoria County has 17 incorporated cities, towns and villages. Populations count the people living inside Peoria County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Peoria (county seat) | City | 110,920 | |
| Chillicothe | City | 6,033 | |
| Bartonville | Village | 5,804 | |
| Peoria Heights | Village | 5,767 | Tazewell County |
| West Peoria | City | 4,187 | |
| Elmwood | City | 2,030 | |
| Bellevue | Village | 1,888 | |
| Princeville | Village | 1,713 | |
| Dunlap | Village | 1,588 | |
| Hanna City | Village | 1,238 | |
| Glasford | Village | 842 | |
| Brimfield | Village | 764 | |
| Norwood | Village | 431 | |
| Kingston Mines | Village | 259 | |
| Mapleton | Village | 251 | |
| Farmington | City | 0 | Fulton County |
| Pekin | City | 0 | Tazewell County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Rome | 1,947 | |
| Lake Camelot | 1,629 | |
| Trivoli | 365 | |
| Mossville | 51 | |
| Smithville | 44 |
ZIP codes in Peoria County
28 ZIP codes reach into Peoria County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 61451
- 61489 also Knox County
- 61517
- 61523 also Marshall County
- 61525
- 61526 also Marshall County
- 61528
- 61529 also Knox County
- 61531 also Fulton and Knox counties
- 61533 also Fulton County
- 61536
- 61539
- 61547
- 61552
- 61559 also Stark County
- 61562
- 61565 also Marshall County
- 61569 also Fulton County
- 61602
- 61603
- 61604
- 61605
- 61606
- 61607
- 61614
- 61615
- 61616
- 61625
Population of Peoria County, 2020–2025
Peoria County shrank by 3,455 people (−1.9%) between April 2020 and July 2025: 191 more births than deaths and a net loss of 3,686 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 181,505 |
| 2021 | 180,082 |
| 2022 | 178,221 |
| 2023 | 178,098 |
| 2024 | 178,541 |
| 2025 | 178,553 |
Neighboring counties
- Tazewell County southeast · 130,049 people
- Fulton County southwest · 32,901 people
- Stark County north · 5,319 people
- Knox County northwest · 47,767 people
- Marshall County northeast · 11,473 people
- Woodford County east · 38,111 people
Printable Peoria County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (113 KB)
- PNG (2400 px) (87 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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