Richland County, Illinois
County seat: Olney · Population 15,219 (2025) · 360 sq mi
Richland County is the 69th most populous of Illinois's 102 counties, with 15,219 people (2025 estimate). Its county seat is Olney. It is part of the Southeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 5 cities and towns and the 7 neighboring counties.
Richland County facts
- County seat
- Olney
- Population (2025 estimate)
- 15,219 −3.8% since 2020
- Land area
- 360 sq mi 83rd largest of 102
- Water area
- 2 sq mi
- Population density
- 42 per sq mi
- Established
- 1841
- Same name
- One of 6 Richland Counties in the US
- Named after
- Richland County county in Ohio, United States
- Largest city
- Olney 8,347
- Median household income
- $62,455
- Cities and towns
- 5 plus 1 CDPs
- ZIP codes
- 9
- Time zone
- Central
- FIPS code
- 17159
Cities and towns in Richland County
Richland County has 5 incorporated cities, towns and villages. Populations count the people living inside Richland County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Olney (county seat) | City | 8,347 | |
| Noble | Village | 609 | |
| Parkersburg | Village | 184 | |
| Claremont | Village | 158 | |
| Calhoun | Village | 153 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Dundas | 272 |
ZIP codes in Richland County
9 ZIP codes reach into Richland County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62419
- 62421 also Crawford and Lawrence counties
- 62425 also Jasper County
- 62448 also Jasper and Clay counties
- 62450 also Wayne County
- 62452
- 62466 also Lawrence and Crawford counties
- 62476 also Edwards, Wabash and Lawrence counties
- 62868 also Clay and Wayne counties
Population of Richland County, 2020–2025
Richland County shrank by 608 people (−3.8%) between April 2020 and July 2025: 487 more deaths than births and a net loss of 131 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 15,808 |
| 2021 | 15,789 |
| 2022 | 15,527 |
| 2023 | 15,510 |
| 2024 | 15,368 |
| 2025 | 15,219 |
Neighboring counties
- Clay County west · 12,793 people
- Lawrence County east · 13,790 people
- Jasper County north · 9,032 people
- Edwards County south · 5,898 people
- Wayne County southwest · 15,882 people
- Wabash County southeast · 10,907 people
- Crawford County northeast · 18,648 people
Printable Richland 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) (87 KB)
- PNG (2400 px) (65 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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