County · code 47171
Unicoi CountyTennessee
Unicoi County is a county in Tennessee with its seat in Erwin.
- Founded1875
- County seatErwin
- Named forCherokee
- Land area186 sq mi + 0.3 sq mi water
- Population17,928 2020 Census
- Parcels mapped10,301 checked 14 October 2026
Where it is
Unicoi on the map of Tennessee
Tennessee has 95 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1875 from Carter County and Washington County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Unicoi County was created on October 21, 1875, from Carter and Washington counties. It was named after the Cherokee. In 1881, Unicoi lost territory to Greene and Washington counties to accommodate local residents.
- 1875Unicoi County created Unicoi created from Carter and Washington. · Tenn. Acts 1875, 39th assy., ch. 68, secs. 14-15/p. 86; Goodspeed [K], 905
- 1881Lost territory Unicoi lost to Greene, and lost to Washington to accommodate local residents. · Tenn. Acts 1881, 42d assy., 1st sess., ch. 145/p. 194; ch. 147/p. 196
- 1883Boundary clarified Boundary between Unicoi and Carter clarified (no change).with Carterno change· Tenn. Acts 1883, 43d assy., ch. 201/p. 281
Land and parcels
What the maps cover in Unicoi
Who publishes each layer, how good it is, and when we last checked.
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Parcels Official
Lot lines and tax-map numbers for 10,301 parcels from Tennessee Comptroller of the Treasury, Division of Property Assessments (published by the Office of Information Resources). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 10 September 2026 · checked 14 October 2026 -
Address points Official
One point per address, 10,320 in all from TECB and local 911 districts via TNMap (tnmap_oir).
edited 6 October 2026 · checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Unicoi by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Records
County government
- County government
The official website of Unicoi County.
See your own lot on these maps
Open Unicoi County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Unicoi County
- When was Unicoi County founded?
- Unicoi County was founded in 1875, formed from Carter County and Washington County, and named after Cherokee.
- What is the county seat of Unicoi County?
- The county seat of Unicoi County is Erwin.
- Is there an online parcel map for Unicoi County?
- Yes. Tennessee Comptroller of the Treasury, Division of Property Assessments (published by the Office of Information Resources) publishes a parcel map of 10,301 parcels, rated official here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Unicoi County's boundary or name changed?
- Unicoi County was created in 1875 from Carter County and Washington County. Since then the Atlas of Historical County Boundaries records 1 later change, most of them small boundary adjustments, chiefly involving Greene County and Washington County.
- Is my lot in a flood zone?
- We do not have flood maps for Unicoi County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby