ZIP Codes of Union County, KY

Population & People
Population & People
Total Population
13,798
Household Income
Household Income
Median Income
$57,734
Housing
Housing
Total Housing Units
6,051
Business & Economy
Business & Economy
Total Businesses
257
Employment
Employment
Employment Rate
50.51%
Education
Education
Bachelor's Degree+
12.88%
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 (4 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:270 / 364
Timezone:Central (GMT -06:00)
Local Time:2:12:22 PM
Population:13,798 [See All]
FIPS:21225
Land Area:466 sq mi
Water Area:4 sq mi
Coordinates:37.6589, -87.9155
Quick Link:
https://www.zip-codes.com/county/ky-union.asp
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Notable population decline
Lost 12.0% of residents since 2014.

Standout ZIPs in this County


Most Populous
Morganfield · 7,064 people
51.2% of county total
Highest Income
Waverly · $66,373 median
1.1× county average
Largest Land Area
Morganfield · 171.4 sq mi
Spans the most ground
Fastest Growth
Waverly · 46.7% (10-yr)
1,054 → 1,546 residents
Most Educated
Waverly · 19.4% bachelor's+
203 of 1,046 adults 25+

Things worth knowing about Union County


13,798 residents live across 5 ZIPs covering 466 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 15,671 to 13,798 from 2014 to 2024 — a -12.0% change. 2 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 42462 (Waverly, $66,373 median) and poorest ZIP 42461 (Uniontown, $47,746) are 6.0 miles apart — a 1.4× income gap across local geography.

Median home values vary 1.4× across this county — from $96,600 in 42459 (Sturgis) to $137,300 in 42462 (Waverly).

Density varies across the county — from 12 people/sq mi in 42461 (Uniontown) to 41 in 42437 (Morganfield).

Educational attainment ranges from 8.9% bachelor's+ in 42461 (Uniontown) to 19.4% in 42462 (Waverly) — the breadth of educational profiles across the area.

Within Kentucky, this is the #77 most populous of 120 counties and ranks #62 for median household income .

Weighted by population, the typical household earns about $59,877 across the county — reflecting what a typical resident sees, not a simple ZIP average.

12.9% of adults age 25+ hold a bachelor's degree or higher (1,270 of 9,857 reporting).

4 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Union County


Population decline

Union County lost 12.0% of residents between 2014 and 2024. ZIPs that shed the largest share:

Morganfield
-19.4%
8,760 → 7,064 residents
Sturgis
-15.4%
4,613 → 3,903 residents

All ZIP Codes in Union County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
42437MorganfieldStandard7,064$65,256171.4-19.4%
42459SturgisStandard3,903$51,563136.2-15.4%
42462WaverlyStandard1,546$66,37354.246.7%
42461UniontownStandard1,285$47,746104.03.3%
42460SullivanPO Box0.0

Adjacent & Nearby Counties