Fayette County, Illinois
County seat: Vandalia · Population 20,790 (2025) · 717 sq mi
Fayette County is the 55th most populous of Illinois's 102 counties, with 20,790 people (2025 estimate). Its county seat is Vandalia. It is part of the Southeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 7 cities and towns and the 7 neighboring counties.
Fayette County facts
- County seat
- Vandalia
- Population (2025 estimate)
- 20,790 −3.3% since 2020
- Land area
- 717 sq mi 20th largest of 102
- Water area
- 9 sq mi
- Population density
- 29 per sq mi
- Established
- 1821
- Same name
- One of 11 Fayette Counties in the US
- Named after
- Gilbert du Motier, Marquis de Lafayette French general and politician (1757–1834)
- Largest city
- Vandalia 7,108
- Median household income
- $60,944
- Cities and towns
- 7 plus 1 CDPs
- ZIP codes
- 20
- Time zone
- Central
- FIPS code
- 17051
Cities and towns in Fayette County
Fayette County has 7 incorporated cities, towns and villages. Populations count the people living inside Fayette County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Vandalia (county seat) | City | 7,108 | |
| St. Elmo | City | 1,213 | |
| Ramsey | Village | 884 | |
| Brownstown | Village | 674 | |
| Farina | Village | 524 | Marion County |
| St. Peter | Village | 315 | |
| Bingham | Village | 58 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| La Clede | 135 |
ZIP codes in Fayette County
20 ZIP codes reach into Fayette County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62011
- 62032 also Montgomery County
- 62075 also Montgomery and Christian counties
- 62080 also Montgomery and Shelby counties
- 62253 also Bond and Clinton counties
- 62262 also Bond County
- 62411 also Effingham County
- 62414 also Effingham and Shelby counties
- 62418
- 62422 also Shelby County
- 62426 also Clay and Effingham counties
- 62431 also Shelby County
- 62458 also Effingham County
- 62471
- 62838 also Clay, Marion and Effingham counties
- 62854 also Marion and Clay counties
- 62875 also Marion and Clinton counties
- 62880
- 62885
- 62892 also Marion County
Population of Fayette County, 2020–2025
Fayette County shrank by 699 people (−3.3%) between April 2020 and July 2025: 280 more deaths than births and a net loss of 393 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 21,483 |
| 2021 | 21,070 |
| 2022 | 21,119 |
| 2023 | 21,033 |
| 2024 | 20,954 |
| 2025 | 20,790 |
Neighboring counties
- Marion County south · 36,382 people
- Effingham County east · 34,519 people
- Bond County west · 16,959 people
- Montgomery County northwest · 28,076 people
- Shelby County northeast · 20,576 people
- Clinton County southwest · 37,128 people
- Clay County southeast · 12,793 people
Printable Fayette 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) (89 KB)
- PNG (2400 px) (64 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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