Williamson County, Tennessee
County seat: Franklin · Population 272,061 (2025) · 583 sq mi
Williamson County is the 6th most populous of Tennessee's 95 counties, with 272,061 people (2025 estimate). Its county seat is Franklin. It is part of the Middle Tennessee region, one of the 3 Grand Divisions of Tennessee. The map shows its 8 cities and towns and the 7 neighboring counties.
Williamson County facts
- County seat
- Franklin
- Population (2025 estimate)
- 272,061 +9.8% since 2020
- Land area
- 583 sq mi 16th largest of 95
- Water area
- 1 sq mi
- Population density
- 467 per sq mi
- Established
- 1799
- Same name
- One of 3 Williamson Counties in the US
- Named after
- Hugh Williamson American politician (1735-1819)
- Largest city
- Franklin 90,226
- Median household income
- $135,594
- Cities and towns
- 8
- ZIP codes
- 16
- Time zone
- Central
- FIPS code
- 47187
Cities and towns in Williamson County
Williamson County has 8 incorporated cities, towns and villages. Populations count the people living inside Williamson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Franklin (county seat) | City | 90,226 | |
| Brentwood | City | 45,313 | |
| Spring Hill | City | 39,711 | Maury County |
| Nolensville | Town | 15,789 | |
| Fairview | City | 10,877 | |
| Thompson's Station | Town | 9,469 | |
| Eagleville | City | 0 | Rutherford County |
| Smyrna | Town | 0 | Rutherford County |
ZIP codes in Williamson County
16 ZIP codes reach into Williamson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 37014 also Rutherford County
- 37025 also Hickman and Dickson counties
- 37027 also Davidson County
- 37046 also Rutherford and Marshall counties
- 37060 also Rutherford, Bedford and Marshall counties
- 37062 also Dickson and Cheatham counties
- 37064 also Davidson County
- 37067
- 37069
- 37135 also Davidson and Rutherford counties
- 37174 also Maury and Marshall counties
- 37179
- 37215 also Davidson County
- 37221 also Davidson County
- 38401 also Maury and Marshall counties
- 38476 also Hickman and Maury counties
Population of Williamson County, 2020–2025
Williamson County grew by 24,271 people (+9.8%) between April 2020 and July 2025: 3,168 more births than deaths and a net gain of 21,490 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 249,614 |
| 2021 | 256,192 |
| 2022 | 261,335 |
| 2023 | 264,898 |
| 2024 | 268,486 |
| 2025 | 272,061 |
Neighboring counties
- Maury County southwest · 118,131 people
- Rutherford County east · 386,352 people
- Davidson County north · 745,904 people
- Marshall County south · 38,071 people
- Dickson County northwest · 58,662 people
- Hickman County west · 26,219 people
- Cheatham County northwest · 42,778 people
Printable Williamson 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) (104 KB)
- PNG (2400 px) (85 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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