Knox County, Indiana
County seat: Vincennes · Population 35,652 (2025) · 516 sq mi
Knox County is the 44th most populous of Indiana's 92 counties, with 35,652 people (2025 estimate). Its county seat is Vincennes. It is part of the Southwest (Region 11) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 9 cities and towns and the 8 neighboring counties.
Knox County facts
- County seat
- Vincennes
- Population (2025 estimate)
- 35,652 −1.7% since 2020
- Land area
- 516 sq mi 6th largest of 92
- Water area
- 8 sq mi
- Population density
- 69 per sq mi
- Established
- 1790
- Named after
- Henry Knox American general and Secretary of War (1750–1806)
- Largest city
- Vincennes 16,378
- Median household income
- $61,237
- Cities and towns
- 9 plus 4 CDPs
- ZIP codes
- 12
- Time zone
- Eastern
- FIPS code
- 18083
Cities and towns in Knox County
Knox County has 9 incorporated cities, towns and villages. Populations count the people living inside Knox County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Vincennes (county seat) | City | 16,378 | |
| Bicknell | City | 2,982 | |
| Oaktown | Town | 576 | |
| Monroe City | Town | 487 | |
| Bruceville | Town | 448 | |
| Wheatland | Town | 391 | |
| Sandborn | Town | 359 | |
| Edwardsport | Town | 276 | |
| Decker | Town | 197 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Freelandville | 807 | |
| Ragsdale | 88 | |
| Emison | 76 | |
| Westphalia | 47 |
ZIP codes in Knox County
12 ZIP codes reach into Knox County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 47512
- 47516
- 47524
- 47528
- 47535
- 47557
- 47561 also Sullivan County
- 47573
- 47578 also Greene County
- 47591
- 47596
- 47597
Population of Knox County, 2020–2025
Knox County shrank by 632 people (−1.7%) between April 2020 and July 2025: 669 more deaths than births and a net gain of 42 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 36,253 |
| 2021 | 35,964 |
| 2022 | 35,854 |
| 2023 | 35,961 |
| 2024 | 35,757 |
| 2025 | 35,652 |
Neighboring counties
- Daviess County east · 34,209 people
- Gibson County south · 33,091 people
- Lawrence County, Illinois west · 13,790 people
- Pike County southeast · 12,003 people
- Wabash County, Illinois southwest · 10,907 people
- Sullivan County north · 20,831 people
- Greene County northeast · 31,165 people
- Crawford County, Illinois northwest · 18,648 people
Printable Knox 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) (119 KB)
- PNG (2400 px) (105 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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