Unicoi County, Tennessee
County seat: Erwin · Population 17,856 (2025) · 186 sq mi
Unicoi County is the 74th most populous of Tennessee's 95 counties, with 17,856 people (2025 estimate). Its county seat is Erwin. It is part of the East Tennessee region, one of the 3 Grand Divisions of Tennessee. The map shows its 2 cities and towns and the 6 neighboring counties.
Unicoi County facts
- County seat
- Erwin
- Population (2025 estimate)
- 17,856 −0.3% since 2020
- Land area
- 186 sq mi 90th largest of 95
- Water area
- 0 sq mi
- Population density
- 96 per sq mi
- Established
- 1875
- Named after
- Cherokee Iroquoian language spoken by the Cherokee people
- Largest city
- Erwin 6,019
- Median household income
- $52,218
- Cities and towns
- 2 plus 1 CDPs
- ZIP codes
- 6
- Time zone
- Eastern
- FIPS code
- 47171
Cities and towns in Unicoi County
Unicoi County has 2 incorporated cities, towns and villages. Populations count the people living inside Unicoi County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Erwin (county seat) | Town | 6,019 | |
| Unicoi | Town | 3,861 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Banner Hill | 1,211 |
ZIP codes in Unicoi County
6 ZIP codes reach into Unicoi County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 37601 also Washington and Carter counties
- 37643 also Carter County
- 37650 also Washington County
- 37657
- 37658 also Carter County
- 37692
Population of Unicoi County, 2020–2025
Unicoi County shrank by 55 people (−0.3%) between April 2020 and July 2025: 952 more deaths than births and a net gain of 865 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 17,873 |
| 2021 | 17,617 |
| 2022 | 17,607 |
| 2023 | 17,823 |
| 2024 | 17,925 |
| 2025 | 17,856 |
Neighboring counties
- Washington County north · 141,199 people
- Mitchell County, North Carolina southeast · 15,062 people
- Madison County, North Carolina southwest · 22,553 people
- Carter County northeast · 57,361 people
- Yancey County, North Carolina southeast · 19,084 people
- Greene County west · 73,831 people
Printable Unicoi 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) (76 KB)
- PNG (2400 px) (84 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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