ZIP Codes of Adair County, KY

Population & People
Population & People
Total Population
17,978
Household Income
Household Income
Median Income
$61,486
Housing
Housing
Total Housing Units
8,228
Business & Economy
Business & Economy
Total Businesses
326
Employment
Employment
Employment Rate
51.46%
Education
Education
Bachelor's Degree+
22.31%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 6 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:270 / 364
Timezone:Central (GMT -06:00)
Local Time:11:53:34 PM
Population:17,978 [See All]
FIPS:21001
Land Area:398 sq mi
Water Area:7 sq mi
Coordinates:37.0907, -85.3079
Quick Link:
https://www.zip-codes.com/county/ky-adair.asp
Need Adair data in your app? Look up ZIP, county, and city data with a single API call.
Try Free
Wide geographic spread
ZIPs range from 324.5 sq mi down to 4.13 — a 79× sprawl ratio.

Standout ZIPs in this County


Most Populous
Columbia · 16,412 people
91.3% of county total
Highest Income
Glens Fork · $78,269 median
1.3× county average
Largest Land Area
Columbia · 324.5 sq mi
Spans the most ground
Fastest Growth
Columbia · -0.3% (10-yr)
16,458 → 16,412 residents
Most Educated
Columbia · 22.8% bachelor's+
2,492 of 10,952 adults 25+

Things worth knowing about Adair County


17,978 residents live across 6 ZIPs covering 398 sq mi, served by 6 distinct USPS-recognized cities.

Population moved from 18,021 to 17,906 from 2014 to 2024 — a -0.6% change. 1 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 42741 (Glens Fork, $78,269 median) and poorest ZIP 42728 (Columbia, $51,623) are 9.2 miles apart — a 1.5× income gap across local geography.

Median home values vary 2.3× across this county — from $115,000 in 42753 (Knifley) to $266,300 in 42741 (Glens Fork).

Density varies across the county — from 13 people/sq mi in 42715 (Breeding) to 51 in 42728 (Columbia).

Educational attainment ranges from 4.5% bachelor's+ in 42715 (Breeding) to 26.2% in 42741 (Glens Fork) — the breadth of educational profiles across the area.

Within Kentucky, this is the #66 most populous of 120 counties and ranks #49 for median household income .

Weighted by population, the typical household earns about $52,373 across the county — reflecting what a typical resident sees, not a simple ZIP average.

22.3% of adults age 25+ hold a bachelor's degree or higher (2,677 of 12,000 reporting).

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

Stories about Adair 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.

Columbia

All ZIP Codes in Adair County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
42728ColumbiaStandard16,412$51,623324.5-0.3%
42753KnifleyStandard657$54,56525.5-8.5%
42741Glens ForkStandard420$78,26912.6-22.7%
42715BreedingStandard41731.338.1%
42742GradyvilleStandard724.1
42720Cane ValleyPO Box0.0

Adjacent & Nearby Counties