Johnson County, Illinois
County seat: Vienna · Population 13,363 (2025) · 344 sq mi
Johnson County is the 77th most populous of Illinois's 102 counties, with 13,363 people (2025 estimate). Its county seat is Vienna. It is part of the Southern region, one of the 10 Illinois economic development regions (DCEO). The map shows its 7 cities and towns and the 6 neighboring counties.
Johnson County facts
- County seat
- Vienna
- Population (2025 estimate)
- 13,363 +0.4% since 2020
- Land area
- 344 sq mi 85th largest of 102
- Water area
- 5 sq mi
- Population density
- 39 per sq mi
- Established
- 1812
- Same name
- One of 12 Johnson Counties in the US
- Named after
- Richard Mentor Johnson vice president of the United States from 1837 to 1841
- Largest city
- Vienna 1,352
- Median household income
- $62,528
- Cities and towns
- 7
- ZIP codes
- 10
- Time zone
- Central
- FIPS code
- 17087
Cities and towns in Johnson County
Johnson County has 7 incorporated cities, towns and villages. Populations count the people living inside Johnson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Vienna (county seat) | City | 1,352 | |
| Goreville | Village | 1,055 | |
| Cypress | Village | 217 | |
| Buncombe | Village | 207 | |
| New Burnside | Village | 153 | |
| Belknap | Village | 86 | |
| Simpson | Village | 45 |
ZIP codes in Johnson County
10 ZIP codes reach into Johnson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62908 also Massac County
- 62912 also Union County
- 62922 also Williamson County
- 62923 also Union and Pulaski counties
- 62939 also Union and Williamson counties
- 62943 also Massac and Pope counties
- 62967 also Williamson County
- 62972 also Pope County
- 62985 also Pope County
- 62995
Population of Johnson County, 2020–2025
Johnson County grew by 59 people (+0.4%) between April 2020 and July 2025: 245 more deaths than births and a net gain of 318 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 13,317 |
| 2021 | 13,472 |
| 2022 | 13,399 |
| 2023 | 13,366 |
| 2024 | 13,347 |
| 2025 | 13,363 |
Neighboring counties
- Union County west · 16,656 people
- Williamson County north · 67,225 people
- Pope County east · 3,672 people
- Massac County southeast · 13,502 people
- Pulaski County southwest · 4,820 people
- Saline County northeast · 22,772 people
Printable Johnson 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) (79 KB)
- PNG (2400 px) (64 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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