Founded in 1780, Jefferson County is one of 120 counties in the state of Kentucky. Historically, Jefferson County was formed from Kentucky County. The city of Louisville is the county seat. With FIPS code of 111, Jefferson County has a population of 777,874 and area of 385 square miles (997 km2).
List of all cities in Jefferson County, KY alphabetically
| City/Town | Postal Code | Area Code |
| Anchorage, KY | 40223 | 502 |
| Bank One, KY | 40295 | 502 |
| Bank One Accounts, KY | 40293 | 502 |
| Bank One KY, KY | 40294 | 502 |
| Buechel, KY | 40218 | 502 |
| Eastwood, KY | 40018 | 502 |
| Fairdale, KY | 40118 | 502 |
| Fern Creek, KY | 40291 | 502 |
| Fisherville, KY | 40023 | 502 |
| General Electric Co, KY | 40225 | 502 |
| Glenview, KY | 40025 | 502 |
| Harrods Creek, KY | 40027 | 502 |
| Highview, KY | 40228 | 502 |
| Jeffersontown, KY | 40269 | 502 |
| 40299 | 502 | |
| Kentucky Lottery Corporation, KY | 40287 | 502 |
| Kosmosdale, KY | 40272 | 502 |
| Louisville, KY | 40201 | 502 |
| 40202 | 502 | |
| 40203 | 502 | |
| 40204 | 502 | |
| 40205 | 502 | |
| 40206 | 502 | |
| 40207 | 502 | |
| 40208 | 502 | |
| 40209 | 502 | |
| 40210 | 502 | |
| 40211 | 502 | |
| 40212 | 502 | |
| 40213 | 502 | |
| 40214 | 502 | |
| 40215 | 502 | |
| 40216 | 502 | |
| 40217 | 502 | |
| 40218 | 502 | |
| 40219 | 502 | |
| 40220 | 502 | |
| 40221 | 502 | |
| 40222 | 502 | |
| 40223 | 502 | |
| 40224 | 502 | |
| 40225 | 502 | |
| 40228 | 502 | |
| 40229 | 502 | |
| 40231 | 502 | |
| 40232 | 502 | |
| 40233 | 502 | |
| 40241 | 502 | |
| 40242 | 502 | |
| 40243 | 502 | |
| 40245 | 502 | |
| 40250 | 502 | |
| 40251 | 502 | |
| 40252 | 502 | |
| 40253 | 502 | |
| 40255 | 502 | |
| 40256 | 502 | |
| 40257 | 502 | |
| 40258 | 502 | |
| 40259 | 502 | |
| 40261 | 502 | |
| 40266 | 502 | |
| 40268 | 502 | |
| 40269 | 502 | |
| 40270 | 502 | |
| 40272 | 502 | |
| 40280 | 502 | |
| 40281 | 502 | |
| 40282 | 502 | |
| 40283 | 502 | |
| 40285 | 502 | |
| 40287 | 502 | |
| 40289 | 502 | |
| 40290 | 502 | |
| 40291 | 502 | |
| 40292 | 502 | |
| 40293 | 502 | |
| 40294 | 502 | |
| 40295 | 502 | |
| 40296 | 502 | |
| 40297 | 502 | |
| 40298 | 502 | |
| 40299 | 502 | |
| Lyndon, KY | 40222 | 502 |
| 40241 | 502 | |
| 40242 | 502 | |
| 40252 | 502 | |
| Masonic Home, KY | 40041 | 502 |
| Middletown, KY | 40243 | 502 |
| 40253 | 502 | |
| National City Bank, KY | 40289 | 502 |
| Okolona, KY | 40219 | 502 |
| 40229 | 502 | |
| 40259 | 502 | |
| Pleasure Ridge Park, KY | 40258 | 502 |
| 40268 | 502 | |
| 40281 | 502 | |
| 40282 | 502 | |
| 40283 | 502 | |
| Pnc Bank, KY | 40296 | 502 |
| 40297 | 502 | |
| Prospect, KY | 40059 | 502 |
| Readers Digest, KY | 40282 | 502 |
| 40283 | 502 | |
| Rr Donnelly, KY | 40281 | 502 |
| Saint Matthews, KY | 40207 | 502 |
| 40257 | 502 | |
| Shared Firm Zip, KY | 40290 | 502 |
| Shively, KY | 40216 | 502 |
| Shively, KY | 40256 | 502 |
| So Baptist Theo Sem, KY | 40280 | 502 |
| University of Louisville, KY | 40292 | 502 |
| Valley Station, KY | 40272 | 502 |
| 40270 | 502 | |
| West Buechel, KY | 40218 | 502 |
| Wilsonville, KY | 40023 | 502 |