County Maps US

Unicoi County, Tennessee

A county in Tennessee, ranked 74 of 95 by population.

CountyFIPS 47171

Within Tennessee
Unicoi County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Erwin, the county seat, located via the 2025 Census Gazetteer.

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Population
17,856
-17 (-0.1%) since 2020
Land area
186.1
square miles. A further 0.2% of the total area is water
Population density
96.0
people per square mile, computed rather than published
County seat
Erwin
Seat of county government.
Established
1875
150 years ago
Largest city
Erwin town
Population 6,019.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Unicoi County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Unicoi County, Tennessee from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 775 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Unicoi County ranks

Position among the 95 counties of Tennessee, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn TennesseeNationally
Population17,85674th of 951,946th of 3,144
Land area186.1 sq mi90th of 953,021st of 3,144
Population density96.0 per sq mi38th of 95941st of 3,144
Median household income$52,21871st of 952,647th of 3,143

Full data for Unicoi County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population17,856Vintage 2025 Population Estimates
Population in 202017,873Vintage 2025 Population Estimates
2020 estimates base?17,911Vintage 2025 Population Estimates
Land area186.1 sq mi2025 Gazetteer Files
Water area0.32 sq mi2025 Gazetteer Files
Total area186.4 sq mi2025 Gazetteer Files
Population density?96.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$52,218American Community Survey 2020-2024 5-Year Estimates
Median home value$189,600American Community Survey 2020-2024 5-Year Estimates
Median age46.9American Community Survey 2020-2024 5-Year Estimates
Households7,795American Community Survey 2020-2024 5-Year Estimates
Housing units8,749American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-144
145 births, 289 deaths
Net migration
+75
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Unicoi County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Washington CountyTennessee21 mi141,199
Mitchell CountyNorth Carolina15 mi15,062
Madison CountyNorth Carolina14 mi22,553
Carter CountyTennessee13 mi57,361
Yancey CountyNorth Carolina8.7 mi19,084
Greene CountyTennessee4.6 mi73,831

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 95 counties of Tennessee

Open the interactive Tennessee county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.