Johnson County, Tennessee
Johnson County, Tennessee, has 18,718 residents (July 2025 estimate). Its county seat is Mountain City. It uses Eastern Time and covers 298 sq mi (773 km²) of land.
- Resident population, July 2025
- 18,718
- Land area
- 298 sq mi (773 km²)
- County seat or government
- Mountain City
- Time zone
- Eastern TimeUTC-05:00 in January; UTC-04:00 in July
- Median household income
- $53,129 ± $4,322
- Median home value
- $178,600 ± $19,569
- Median rent, with utilities
- $674 ± $48
- Homes lived in by their owners
- 77.5% ± 3.3 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Boone, NC micro area, Johnson City, TN metro area, and Kingsport-Bristol, TN-VA metro area
- Water area
- 4.25 sq mi (11 km²)
- State
- Tennessee
- County code (FIPS)
- 47091
- Coordinates (central point)
- 36.453203, -81.861247
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Johnson County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Eastern TimeAmerica/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
5 ZIP Code areas overlap Johnson County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Johnson County, largest first
- Johnson County School District18,196 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Mountain City, Tennessee (town)2,542 people
- Butler, Tennessee (CDP)127 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Watauga County, North Carolina17 mi southeast
- Carter County, Tennessee19 mi southwest
- Ashe County, North Carolina20 mi east
- Washington County, Virginia21 mi north
- Sullivan County, Tennessee25 mi west
- Avery County, North Carolina27 mi south
- Grayson County, Virginia38 mi east
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