Clay County, Illinois
County seat: Louisville · Population 12,793 (2025) · 468 sq mi
Clay County is the 80th most populous of Illinois's 102 counties, with 12,793 people (2025 estimate). Its county seat is Louisville. It is part of the Southeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 6 cities and towns and the 6 neighboring counties.
Clay County facts
- County seat
- Louisville
- Population (2025 estimate)
- 12,793 −3.7% since 2020
- Land area
- 468 sq mi 59th largest of 102
- Water area
- 1 sq mi
- Population density
- 27 per sq mi
- Established
- 1824
- Same name
- One of 18 Clay Counties in the US
- Named after
- Henry Clay American politician from Kentucky (1777-1852)
- Largest city
- Flora 4,634
- Median household income
- $60,417
- Cities and towns
- 6
- ZIP codes
- 13
- Time zone
- Central
- FIPS code
- 17025
Cities and towns in Clay County
Clay County has 6 incorporated cities, towns and villages. Populations count the people living inside Clay County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Flora | City | 4,634 | |
| Louisville (county seat) | Village | 1,108 | |
| Clay City | Village | 816 | |
| Xenia | Village | 360 | |
| Iola | Village | 96 | |
| Sailor Springs | Village | 87 |
ZIP codes in Clay County
13 ZIP codes reach into Clay County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62424 also Effingham and Jasper counties
- 62426 also Effingham and Fayette counties
- 62434 also Jasper County
- 62443 also Effingham County
- 62448 also Jasper and Richland counties
- 62824 also Wayne County
- 62838 also Fayette, Marion and Effingham counties
- 62839
- 62854 also Marion and Fayette counties
- 62858 also Effingham County
- 62868 also Richland and Wayne counties
- 62879
- 62899 also Wayne County
Population of Clay County, 2020–2025
Clay County shrank by 496 people (−3.7%) between April 2020 and July 2025: 192 more deaths than births and a net loss of 307 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 13,271 |
| 2021 | 13,163 |
| 2022 | 13,049 |
| 2023 | 12,948 |
| 2024 | 12,845 |
| 2025 | 12,793 |
Neighboring counties
- Richland County east · 15,219 people
- Wayne County south · 15,882 people
- Effingham County north · 34,519 people
- Marion County west · 36,382 people
- Jasper County northeast · 9,032 people
- Fayette County northwest · 20,790 people
Printable Clay 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) (83 KB)
- PNG (2400 px) (60 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.
Back to the Illinois county map with all 102 counties. Found an error? Tell us.