Effingham County, Illinois
County seat: Effingham · Population 34,519 (2025) · 479 sq mi
Effingham County is the 41st most populous of Illinois's 102 counties, with 34,519 people (2025 estimate). Its county seat is Effingham. It is part of the Southeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 10 cities and towns and the 5 neighboring counties.
Effingham County facts
- County seat
- Effingham
- Population (2025 estimate)
- 34,519 −0.4% since 2020
- Land area
- 479 sq mi 57th largest of 102
- Water area
- 1 sq mi
- Population density
- 72 per sq mi
- Established
- 1831
- Named after
- Thomas Howard, 3rd Earl of Effingham British Earl and Governor of Jamaica (1746-1791)
- Largest city
- Effingham 12,406
- Median household income
- $80,404
- Cities and towns
- 10
- ZIP codes
- 15
- Time zone
- Central
- FIPS code
- 17049
Cities and towns in Effingham County
Effingham County has 10 incorporated cities, towns and villages. Populations count the people living inside Effingham County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Effingham (county seat) | City | 12,406 | |
| Altamont | City | 2,186 | |
| Teutopolis | Village | 1,721 | |
| Dieterich | Village | 882 | |
| Watson | Village | 658 | |
| Beecher City | Village | 425 | |
| Edgewood | Village | 390 | |
| Mason | Town | 321 | |
| Montrose | Village | 209 | Cumberland County |
| Shumway | Village | 185 |
ZIP codes in Effingham County
15 ZIP codes reach into Effingham County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62401 also Shelby County
- 62411 also Fayette County
- 62414 also Fayette and Shelby counties
- 62424 also Jasper and Clay counties
- 62426 also Clay and Fayette counties
- 62443 also Clay County
- 62445 also Jasper and Cumberland counties
- 62458 also Fayette County
- 62461 also Shelby County
- 62462 also Shelby and Cumberland counties
- 62467 also Jasper and Cumberland counties
- 62473
- 62479 also Jasper County
- 62838 also Fayette, Clay and Marion counties
- 62858 also Clay County
Population of Effingham County, 2020–2025
Effingham County shrank by 146 people (−0.4%) between April 2020 and July 2025: 95 more births than deaths and a net loss of 244 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 34,695 |
| 2021 | 34,513 |
| 2022 | 34,317 |
| 2023 | 34,450 |
| 2024 | 34,541 |
| 2025 | 34,519 |
Neighboring counties
- Fayette County west · 20,790 people
- Jasper County east · 9,032 people
- Shelby County northwest · 20,576 people
- Clay County south · 12,793 people
- Cumberland County northeast · 10,208 people
Printable Effingham 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) (61 KB)
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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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