ZIP Codes of Union County, TN

Population & People
Population & People
Total Population
17,186
Household Income
Household Income
Median Income
$63,707
Housing
Housing
Total Housing Units
7,897
Business & Economy
Business & Economy
Total Businesses
203
Employment
Employment
Employment Rate
52.12%
Education
Education
Bachelor's Degree+
13.95%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 3 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:3 ZIP Codes (3 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:865
Timezone:Eastern (GMT -05:00)
Local Time:2:13:49 PM
Population:17,186 [See All]
FIPS:47173
CBSA:Knoxville, TN
Land Area:191 sq mi
Water Area:19 sq mi
Coordinates:36.2725, -83.8139
Quick Link:
https://www.zip-codes.com/county/tn-union.asp
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Tennessee's #71 most populous county
17,186 residents across 3 ZIPs — #71 of 95 Tennessee counties.

Standout ZIPs in this County


Most Populous
Maynardville · 11,069 people
64.4% of county total
Highest Income
Sharps Chapel · $77,091 median
1.2× county average
Largest Land Area
Maynardville · 89.2 sq mi
Spans the most ground
Fastest Growth
Sharps Chapel · 55.3% (10-yr)
1,589 → 2,468 residents
Most Educated
Sharps Chapel · 19.0% bachelor's+
351 of 1,846 adults 25+

Things worth knowing about Union County


17,186 residents live across 3 ZIPs covering 191 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 15,593 to 17,186 from 2014 to 2024 — a +10.2% change. 2 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 37866 (Sharps Chapel, $77,091 median) and poorest ZIP 37779 (Luttrell, $51,357) are 10.4 miles apart — a 1.5× income gap across local geography.

Median home values vary 1.7× across this county — from $162,900 in 37779 (Luttrell) to $279,000 in 37866 (Sharps Chapel).

Density varies across the county — from 37 people/sq mi in 37866 (Sharps Chapel) to 124 in 37807 (Maynardville).

Educational attainment ranges from 11.6% bachelor's+ in 37779 (Luttrell) to 19.0% in 37866 (Sharps Chapel) — the breadth of educational profiles across the area.

Within Tennessee, this is the #71 most populous of 95 counties and ranks #37 for median household income with the #23 fastest decade growth .

Weighted by population, the typical household earns about $62,341 across the county — reflecting what a typical resident sees, not a simple ZIP average.

14.0% of adults age 25+ hold a bachelor's degree or higher (1,726 of 12,370 reporting).

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

Stories about Union County


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.

Maynardville

All ZIP Codes in Union County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
37807MaynardvilleStandard11,069$62,67389.211.8%
37779LuttrellStandard3,649$51,35734.6-11.0%
37866Sharps ChapelStandard2,468$77,09167.455.3%

Adjacent & Nearby Counties