County ZIP codes · Kentucky · FIPS 21093
Hardin County, KY ZIP Codes
Hardin County, Kentucky has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 16 residential and 3 for PO boxes or a single organization. 10 of the residential ones lie mainly in Hardin County and 6 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $58,506 in 40160 (Radcliff) to $84,720 in 40162 (Rineyville) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Hardin 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 $65,500 and $77,509.
They carry 16 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 16 residential ZIP codes in Hardin County
10 ZIP codes lie mainly in Hardin County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 42701 | Elizabethtown | 53,987 | 333 | $70k | $260k | 100% |
| 40160 | Radcliff | 23,624 | 1,379 | $59k | $166k | 100% |
| 40121 | Fort Knox | 8,836 | 251 | $83k | – | 84% |
| 40162 | Rineyville | 6,180 | 126 | $85k | $305k | 100% |
| 42724 | Cecilia | 5,345 | 70 | $74k | $197k | 100% |
| 42776 | Sonora | 2,082 | 32 | $59k | $193k | 69% |
| 42740 | Glendale | 1,873 | 60 | $88k | $239k | 100% |
| 42712 | Big Clifty | 1,714 | 32 | $46k | $147k | 52% |
| 42732 | Eastview | 1,541 | 29 | $73k | $266k | 100% |
| 42788 | White Mills | 192 | 25 | – | – | 100% |
Partly in Hardin County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 40177 | West Point | 1,523 | 98 | $51k | $122k | 44% |
| 42784 | Upton | 3,089 | 47 | $69k | $178k | 36% |
| 40175 | Vine Grove | 15,718 | 195 | $78k | $224k | 35% |
| 40150 | Lebanon Junction | 4,950 | 81 | $66k | $178k | 4% |
| 40051 | New Haven | 4,658 | 51 | $80k | $213k | 3% |
| 40140 | Garfield | 866 | 32 | $82k | $136k | 3% |
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 Hardin County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Hardin | Elsewhere |
|---|---|---|
| 40175 | 35% | Meade County46%; Breckinridge County19% |
| 40121 | 84% | Meade County16% |
| 40150 | 4% | Bullitt County96% |
| 40051 | 3% | Nelson County68%; Larue County29% |
| 42784 | 36% | Hart County39%; Larue County24% |
| 42776 | 69% | Larue County31% |
| 42712 | 52% | Grayson County48% |
| 40177 | 44% | Bullitt County49%; Jefferson County7% |
| 40140 | 3% | Breckinridge County97% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Hardin County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Hardin County's ZIP codes use 3 prefixes: 400, 401 and 427.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 400 | Louisville, KY (SCF 400) | 1 | 54 |
| 401 | Louisville, KY (SCF 400) | 9 | 36 |
| 427 | Louisville, KY (SCF 400) | 9 | 38 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.