Johnson County, Indiana
County seat: Franklin · Population 174,262 (2025) · 320 sq mi
Johnson County is the 11th most populous of Indiana's 92 counties, with 174,262 people (2025 estimate). Its county seat is Franklin. It is part of the Central (Region 5) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 8 cities and towns and the 5 neighboring counties.
Johnson County facts
- County seat
- Franklin
- Population (2025 estimate)
- 174,262 +7.7% since 2020
- Land area
- 320 sq mi 75th largest of 92
- Water area
- 1 sq mi
- Population density
- 544 per sq mi
- Established
- 1823
- Named after
- John Johnson American judge (1776-1817)
- Largest city
- Greenwood 69,349
- Median household income
- $90,454
- Cities and towns
- 8 plus 3 CDPs
- ZIP codes
- 12
- Time zone
- Eastern
- FIPS code
- 18081
Cities and towns in Johnson County
Johnson County has 8 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 |
|---|---|---|---|
| Greenwood | City | 69,349 | |
| Franklin (county seat) | City | 26,743 | |
| Bargersville | Town | 11,862 | |
| New Whiteland | Town | 5,937 | |
| Whiteland | Town | 5,884 | |
| Edinburgh | Town | 3,987 | Bartholomew and Shelby counties |
| Trafalgar | Town | 1,658 | |
| Prince's Lakes | Town | 1,384 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Nineveh | 559 | |
| Amity | 317 | |
| Needham | 0 |
ZIP codes in Johnson County
12 ZIP codes reach into Johnson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 46106 also Morgan County
- 46124 also Shelby and Bartholomew counties
- 46131 also Shelby County
- 46142
- 46143
- 46151 also Morgan and Monroe counties
- 46160 also Brown and Morgan counties
- 46162 also Shelby County
- 46164 also Brown County
- 46181 also Brown County
- 46184
- 46259 also Marion and Shelby counties
Population of Johnson County, 2020–2025
Johnson County grew by 12,486 people (+7.7%) between April 2020 and July 2025: 1,387 more births than deaths and a net gain of 11,179 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 162,237 |
| 2021 | 164,330 |
| 2022 | 165,804 |
| 2023 | 168,405 |
| 2024 | 171,023 |
| 2025 | 174,262 |
Neighboring counties
- Morgan County west · 74,967 people
- Shelby County east · 45,882 people
- Marion County north · 992,196 people
- Brown County south · 15,777 people
- Bartholomew County southeast · 85,729 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) (89 KB)
- PNG (2400 px) (69 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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