DeKalb County, Tennessee
County seat: Smithville · Population 21,873 (2025) · 304 sq mi
DeKalb County is the 65th most populous of Tennessee's 95 counties, with 21,873 people (2025 estimate). Its county seat is Smithville. It is part of the Middle Tennessee region, one of the 3 Grand Divisions of Tennessee. The map shows its 4 cities and towns and the 6 neighboring counties.
DeKalb County facts
- County seat
- Smithville
- Population (2025 estimate)
- 21,873 +9% since 2020
- Land area
- 304 sq mi 73rd largest of 95
- Water area
- 25 sq mi
- Population density
- 72 per sq mi
- Established
- 1837
- Same name
- One of 6 DeKalb Counties in the US
- Named after
- Johann de Kalb American general (1721-1780)
- Largest city
- Smithville 5,620
- Median household income
- $53,153
- Cities and towns
- 4
- ZIP codes
- 11
- Time zone
- Central
- FIPS code
- 47041
Cities and towns in DeKalb County
DeKalb County has 4 incorporated cities, towns and villages. Populations count the people living inside DeKalb County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Smithville (county seat) | City | 5,620 | |
| Alexandria | Town | 951 | |
| Dowelltown | Town | 370 | |
| Liberty | Town | 342 |
ZIP codes in DeKalb County
11 ZIP codes reach into DeKalb County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 37012 also Wilson and Smith counties
- 37059
- 37095 also Cannon and Wilson counties
- 37166 also Warren and Cannon counties
- 38544 also Putnam County
- 38548 also Putnam and Smith counties
- 38567 also Smith County
- 38569 also Smith County
- 38581 also Warren and Van Buren counties
- 38582 also Putnam County
- 38583 also White, Putnam, Cumberland and Van Buren counties
Population of DeKalb County, 2020–2025
DeKalb County grew by 1,799 people (+9%) between April 2020 and July 2025: 252 more deaths than births and a net gain of 2,027 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 20,186 |
| 2021 | 20,503 |
| 2022 | 20,987 |
| 2023 | 21,301 |
| 2024 | 21,684 |
| 2025 | 21,873 |
Neighboring counties
- Smith County north · 20,981 people
- White County east · 29,612 people
- Putnam County northeast · 86,612 people
- Warren County south · 43,717 people
- Wilson County northwest · 175,033 people
- Cannon County southwest · 15,296 people
Printable DeKalb 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) (77 KB)
- PNG (2400 px) (81 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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