First three digits · Kentucky
ZIP Codes Starting with
54 ZIP codes start with 400, sorted at the Louisville, KY (SCF 400) sectional center (USPS labeling list L005, effective October 1, 2026) in Kentucky: 49 residential ZIP codes across 10 counties and 5 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 400 mean?
The first digit, 4, is one of ten national areas (Indiana, Kentucky, Michigan and Ohio). The first three, 400, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 400 to the Louisville, KY (SCF 400) facility. The last two digits pick the delivery area. By residents, the largest town names among the 400 ZIP codes are Shelbyville, Bardstown, La Grange, Mount Washington, Crestwood and Prospect.
The same facility sorts 5 prefixes, 249 ZIP codes in all: 400, 401, 402, 427, 471.
Where are the 400 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 400
| County | ||||||
|---|---|---|---|---|---|---|
| 40003 | Bagdad | Shelby County | 1,807 | 42 | $98k | $345k |
| 40004 | Bardstown | Nelson County | 30,601 | 210 | $67k | $242k |
| 40006 | Bedford | Trimble County | 5,068 | 57 | $60k | $182k |
| 40007 | Bethlehem | Henry County | 47 | 6 | $64k | $189k |
| 40008 | Bloomfield | Nelson County | 4,020 | 45 | $67k | $224k |
| 40009 | Bradfordsville | Marion County | 1,851 | 29 | $64k | $67k |
| 40010 | Buckner | Oldham County | 678 | 442 | $196k | $592k |
| 40011 | Campbellsburg | Henry County | 2,379 | 46 | $71k | $173k |
| 40012 | Chaplin | Nelson County | 712 | 64 | $105k | $219k |
| 40013 | Coxs Creek | Nelson County | 6,670 | 88 | $100k | $265k |
| 40014 | Crestwood | Oldham County | 23,101 | 443 | $121k | $394k |
| 40018 | Eastwood | Jefferson County | PO Box or unique | – | – | – |
| 40019 | Eminence | Henry County | 4,238 | 109 | $61k | $220k |
| 40020 | Fairfield | Nelson County | 199 | 419 | $91k | – |
| 40022 | Finchville | Shelby County | 903 | 55 | $98k | $577k |
| 40023 | Fisherville | Jefferson County | 6,870 | 283 | $145k | $498k |
| 40025 | Glenview | Jefferson County | 565 | 439 | $250k+ | $1.38M |
| 40026 | Goshen | Oldham County | 5,975 | 193 | $134k | $432k |
| 40027 | Harrods Creek | Jefferson County | PO Box or unique | – | – | – |
| 40031 | La Grange | Oldham County | 26,259 | 393 | $99k | $341k |
| 40032 | La Grange | Oldham County | PO Box or unique | – | – | – |
| 40033 | Lebanon | Marion County | 11,923 | 85 | $58k | $174k |
| 40036 | Lockport | Henry County | 164 | 6 | – | – |
| 40037 | Loretto | Marion County | 2,793 | 56 | $70k | $215k |
| 40040 | Mackville | Washington County | 779 | 43 | – | $159k |
| 40041 | Masonic Home | Jefferson County | 564 | 4,338 | $153k | – |
| 40045 | Milton | Trimble County | 3,251 | 65 | $77k | $175k |
| 40046 | Mount Eden | Spencer County | 1,122 | 23 | $66k | $221k |
| 40047 | Mount Washington | Bullitt County | 23,662 | 792 | $99k | $279k |
| 40048 | Nazareth | Nelson County | PO Box or unique | – | – | – |
| 40049 | Nerinx | Marion County | 108 | 339 | – | – |
| 40050 | New Castle | Henry County | 2,045 | 119 | $45k | $127k |
| 40051 | New Haven | Nelson County | 4,658 | 51 | $80k | $213k |
| 40052 | New Hope | Nelson County | 655 | 29 | $46k | – |
| 40055 | Pendleton | Trimble County | 1,942 | 82 | $98k | $295k |
| 40056 | Pewee Valley | Oldham County | 3,441 | 1,165 | $134k | $340k |
| 40057 | Pleasureville | Henry County | 4,065 | 43 | $78k | $227k |
| 40058 | Port Royal | Henry County | 37 | 1,850 | $67k | $213k |
| 40059 | Prospect | Oldham County | 20,892 | 741 | $153k | $559k |
| 40060 | Raywick | Marion County | 1,114 | 27 | $45k | $159k |
| 40061 | Saint Catharine | Washington County | 168 | 1,366 | – | – |
| 40062 | Saint Francis | Marion County | 280 | 49 | $53k | $123k |
| 40063 | Saint Mary | Marion County | 326 | 4,347 | – | – |
| 40065 | Shelbyville | Shelby County | 32,160 | 192 | $78k | $281k |
| 40066 | Shelbyville | Shelby County | PO Box or unique | – | – | – |
| 40067 | Simpsonville | Shelby County | 6,365 | 146 | $98k | $361k |
| 40068 | Smithfield | Henry County | 2,570 | 59 | $81k | $325k |
| 40069 | Springfield | Washington County | 8,015 | 42 | $71k | $194k |
| 40070 | Sulphur | Henry County | 360 | 29 | – | $168k |
| 40071 | Taylorsville | Spencer County | 17,239 | 142 | $99k | $329k |
| 40075 | Turners Station | Henry County | 1,151 | 24 | $64k | $164k |
| 40076 | Waddy | Shelby County | 2,898 | 51 | $92k | $259k |
| 40077 | Westport | Oldham County | 678 | 87 | $73k | $196k |
| 40078 | Willisburg | Washington County | 2,661 | 43 | $54k | $183k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.