First three digits · Kentucky
ZIP Codes Starting with
36 ZIP codes start with 401, sorted at the Louisville, KY (SCF 400) sectional center (USPS labeling list L005, effective October 1, 2026) in Kentucky: 31 residential ZIP codes across 6 counties and 5 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 401 mean?
The first digit, 4, is one of ten national areas (Indiana, Kentucky, Michigan and Ohio). The first three, 401, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 401 to the Louisville, KY (SCF 400) facility. The last two digits pick the delivery area. By residents, the largest town names among the 401 ZIP codes are Shepherdsville, Radcliff, Vine Grove, Brandenburg, Fairdale and Fort Knox.
The same facility sorts 5 prefixes, 249 ZIP codes in all: 400, 401, 402, 427, 471.
Where are the 401 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 401
| County | ||||||
|---|---|---|---|---|---|---|
| 40104 | Battletown | Meade County | 1,143 | 19 | $71k | $150k |
| 40107 | Boston | Nelson County | 2,187 | 41 | $60k | $204k |
| 40108 | Brandenburg | Meade County | 12,821 | 186 | $78k | $222k |
| 40109 | Brooks | Bullitt County | 2,376 | 178 | $76k | $262k |
| 40110 | Clermont | Bullitt County | 440 | 88 | $47k | $172k |
| 40111 | Cloverport | Breckinridge County | 1,903 | 56 | $42k | $118k |
| 40115 | Custer | Breckinridge County | 1,012 | 57 | $75k | $149k |
| 40117 | Ekron | Meade County | 2,050 | 97 | $59k | $197k |
| 40118 | Fairdale | Jefferson County | 10,697 | 712 | $59k | $157k |
| 40119 | Falls Of Rough | Breckinridge County | 1,976 | 18 | $66k | $129k |
| 40121 | Fort Knox | Hardin County | 8,836 | 251 | $83k | – |
| 40122 | Fort Knox | Hardin County | PO Box or unique | – | – | – |
| 40129 | Hillview | Bullitt County | PO Box or unique | – | – | – |
| 40140 | Garfield | Breckinridge County | 866 | 32 | $82k | $136k |
| 40142 | Guston | Meade County | 2,253 | 50 | $81k | $166k |
| 40143 | Hardinsburg | Breckinridge County | 5,756 | 41 | $60k | $156k |
| 40144 | Harned | Breckinridge County | 1,930 | 34 | $42k | $218k |
| 40145 | Hudson | Breckinridge County | 1,175 | 31 | $34k | $78k |
| 40146 | Irvington | Breckinridge County | 3,650 | 48 | $54k | $151k |
| 40150 | Lebanon Junction | Bullitt County | 4,950 | 81 | $66k | $178k |
| 40152 | McDaniels | Breckinridge County | 728 | 74 | $71k | $174k |
| 40153 | McQuady | Breckinridge County | PO Box or unique | – | – | – |
| 40155 | Muldraugh | Meade County | 1,127 | 890 | $61k | $77k |
| 40157 | Payneville | Meade County | 854 | 26 | $59k | $245k |
| 40159 | Radcliff | Hardin County | PO Box or unique | – | – | – |
| 40160 | Radcliff | Hardin County | 23,624 | 1,379 | $59k | $166k |
| 40161 | Rhodelia | Meade County | 182 | 24 | $74k | – |
| 40162 | Rineyville | Hardin County | 6,180 | 126 | $85k | $305k |
| 40165 | Shepherdsville | Bullitt County | 38,403 | 339 | $80k | $250k |
| 40166 | Shepherdsville | Bullitt County | PO Box or unique | – | – | – |
| 40170 | Stephensport | Breckinridge County | 396 | 17 | – | $343k |
| 40171 | Union Star | Breckinridge County | 272 | 13 | $46k | $82k |
| 40175 | Vine Grove | Meade County | 15,718 | 195 | $78k | $224k |
| 40176 | Webster | Breckinridge County | 898 | 25 | $62k | $189k |
| 40177 | West Point | Bullitt County | 1,523 | 98 | $51k | $122k |
| 40178 | Westview | Breckinridge County | 522 | 64 | $54k | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.