| County | 2023 | 2010 | 2000 |
|---|---|---|---|
| Bullitt (KY) | 81,729 | 74,319 | 61,241 |
| Clark (IN) | 120,185 | 110,232 | 96,473 |
| Floyd (IN) | 79,594 | 74,578 | 70,821 |
| Harrison (IN) | 39,516 | 39,364 | 34,327 |
| Henry (KY) | 15,691 | 15,416 | 15,060 |
| Jefferson (KY) | 780,449 | 741,096 | 693,614 |
| Oldham (KY) | 67,586 | 60,316 | 46,179 |
| Shelby (KY) | 47,523 | 42,074 | 33,338 |
| Spencer (KY) | 19,256 | 17,061 | 11,765 |
| Washington (IN) | 28,025 | 28,262 | 27,223 |
| Hardin (KY) | 110,134 | 105,543 | 94,174 |
| Meade (KY) | 29,735 | 28,602 | 26,349 |
| Nelson (KY) | 46,440 | 43,437 | 37,477 |
| Scott (IN) | 24,290 | 24,181 | 22,960 |
| Trimble (KY) | 8,502 | 8,809 | 8,125 |
| 15-County Greater Louisville Region | 1,498,655 | 1,413,290 | 1,279,126 |