County ZIP codes · Kentucky · FIPS 21001
Adair County, KY ZIP Codes
Adair County, Kentucky has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 11 residential and 1 for PO boxes or a single organization. 5 of the residential ones lie mainly in Adair County and 6 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $40,862 in 42539 (Liberty) to $53,609 in 42129 (Edmonton) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Adair County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $49,457 and $52,633.
They carry 11 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 11 residential ZIP codes in Adair County
5 ZIP codes lie mainly in Adair County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 42728 | Columbia | 16,412 | 51 | $52k | $151k | 96% |
| 42753 | Knifley | 657 | 26 | $55k | $115k | 100% |
| 42741 | Glens Fork | 420 | 33 | $78k | $266k | 98% |
| 42715 | Breeding | 417 | 17 | – | $227k | 62% |
| 42742 | Gradyville | 72 | 37 | – | – | 100% |
Partly in Adair County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 42528 | Dunnville | 2,126 | 40 | $50k | $159k | 16% |
| 42642 | Russell Springs | 13,459 | 96 | $53k | $153k | 10% |
| 42129 | Edmonton | 7,302 | 38 | $54k | $111k | 5% |
| 42743 | Greensburg | 9,342 | 45 | $50k | $136k | 3% |
| 42733 | Elk Horn | 1,610 | 29 | $81k | $184k | 3% |
| 42539 | Liberty | 9,249 | 42 | $41k | $131k | 1% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
9 ZIP codes of Adair County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Adair | Elsewhere |
|---|---|---|
| 42728 | 96% | Taylor County 4% |
| 42642 | 10% | Russell County 86%; Pulaski County 3% |
| 42743 | 3% | Green County 97% |
| 42539 | 1% | Casey County 99% |
| 42129 | 5% | Metcalfe County 95% |
| 42528 | 16% | Casey County 66%; Russell County 17% |
| 42733 | 3% | Taylor County 70%; Casey County 27% |
| 42741 | 98% | Russell County 2% |
| 42715 | 62% | Metcalfe County 22%; Cumberland County 16% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 42720 | Cane Valley |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Adair County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Adair County's ZIP codes use 4 prefixes: 421, 425, 426 and 427.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 421 | Nashville, TN (SCF 370) | 1 | 33 |
| 425 | Knoxville, TN (SCF 377) | 2 | 17 |
| 426 | Knoxville, TN (SCF 377) | 1 | 12 |
| 427 | Louisville, KY (SCF 400) | 8 | 38 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.