Kentucky ZIP codes
Kentucky holds 946 ZIP codes between 40003 and 42788. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Kentucky
| Place | ZIP codes |
|---|---|
| Louisville | 66 |
| Lexington | 39 |
| Frankfort | 9 |
| London | 6 |
| Covington | 5 |
| Ashland | 4 |
| Newport | 4 |
| Owensboro | 4 |
| Bowling Green | 4 |
| Paducah | 3 |
| Somerset | 3 |
| Glasgow | 2 |
| Hebron | 2 |
| Florence | 2 |
| Paris | 2 |
| Danville | 2 |
| Shepherdsville | 2 |
| Hopkinsville | 2 |
| Winchester | 2 |
| Leitchfield | 2 |
Kentucky counties by ZIP count
| County | ZIP codes |
|---|---|
| Jefferson | 73 |
| Pike | 41 |
| Fayette | 39 |
| Floyd | 33 |
| Harlan | 26 |
| Perry | 25 |
| Letcher | 24 |
| Johnson | 18 |
| Knott | 18 |
| Knox | 17 |
Reading a Kentucky ZIP code
Kentucky holds 946 ZIP codes between 40003 and 42788, spread over 120 counties. Louisville leads the state with 66 codes, ahead of Lexington with 39. Every code here opens with the digit 4: that opening number is the national postal region Kentucky belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Louisville spreads across 66 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Kentucky; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources