ZIP Codes of Johnson County, TN

Population & People
Population & People
Total Population
19,304
Household Income
Household Income
Median Income
$45,403
Housing
Housing
Total Housing Units
9,599
Business & Economy
Business & Economy
Total Businesses
262
Employment
Employment
Employment Rate
43.55%
Education
Education
Bachelor's Degree+
17.45%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:5 ZIP Codes (5 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:423
Timezone:Eastern (GMT -05:00)
Local Time:2:13:47 PM
Population:19,304 [See All]
FIPS:47091
Land Area:344 sq mi
Water Area:8 sq mi
Coordinates:36.4501, -81.8360
Quick Link:
https://www.zip-codes.com/county/tn-johnson.asp
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Sharp income gradient
Wealthiest ZIP earns 4.0× the poorest — $55,979 vs $13,976.
Striking education divide
Bachelor's share spans 6.4% to 37.1% — a 31-point gap.

Standout ZIPs in this County


Most Populous
Mountain City · 12,943 people
67.0% of county total
Highest Income
Mountain City · $55,979 median
1.2× county average
Largest Land Area
Mountain City · 135.2 sq mi
Spans the most ground
Fastest Growth
Butler · 12.7% (10-yr)
3,416 → 3,851 residents
Most Educated
Butler · 20.9% bachelor's+
666 of 3,184 adults 25+

Things worth knowing about Johnson County


19,304 residents live across 5 ZIPs covering 344 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 19,043 to 19,304 from 2014 to 2024 — a +1.4% change. 3 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 37683 (Mountain City, $55,979 median) and poorest ZIP 37691 (Trade, $13,976) are 7.4 miles apart — a 4.0× income gap across local geography.

Median home values vary 2.0× across this county — from $164,300 in 37688 (Shady Valley) to $336,500 in 37680 (Laurel Bloomery).

Density varies across the county — from 21 people/sq mi in 37688 (Shady Valley) to 96 in 37683 (Mountain City).

Educational attainment ranges from 6.4% bachelor's+ in 37680 (Laurel Bloomery) to 37.1% in 37688 (Shady Valley) — the breadth of educational profiles across the area.

Within Tennessee, this is the #67 most populous of 95 counties and ranks #90 for median household income .

Weighted by population, the typical household earns about $54,319 across the county — reflecting what a typical resident sees, not a simple ZIP average.

17.4% of adults age 25+ hold a bachelor's degree or higher (2,589 of 14,840 reporting).

5 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Johnson County


Two counties in one

Median household income spans 4.0× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.

Wealthiest ZIP
Mountain City
Median income: $55,979
Population: 12,943
Bachelor's+: 14.7%
vs
Poorest ZIP (pop >= 500)
Trade
Median income: $13,976
Population: 475
Bachelor's+: 26.6%
For every $1 of household income in 37691, the typical household in 37683 earns $4.01.

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Mountain City

All ZIP Codes in Johnson County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
37683Mountain CityStandard12,943$55,979135.2-3.6%
37640ButlerStandard3,851$55,402111.612.7%
37688Shady ValleyStandard1,138$53,33354.118.4%
37680Laurel BloomeryStandard897$48,32429.084.9%
37691TradeStandard475$13,97614.3-37.5%

Adjacent & Nearby Counties