Kentucky Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Kentucky was 4.49M. Among all Kentucky counties, Jefferson was the most populated county (780.45K), followed by Fayette (321.35K), and then Kenton (168.26K).
On the other hand, the least populated counties were: Robertson (2.20K), Owsley (4.09K), and Hickman (4.53K).
The chart and table below shows the population of each county and the percentage of Kentucky population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Kentucky ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Kentucky Population By County in 2021
Kentucky Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adair | 18832 | 0.42 |
| Allen | 20604 | 0.46 |
| Anderson | 23646 | 0.53 |
| Ballard | 7814 | 0.17 |
| Barren | 44277 | 0.99 |
| Bath | 12680 | 0.28 |
| Bell | 24674 | 0.55 |
| Boone | 134599 | 3.00 |
| Bourbon | 20281 | 0.45 |
| Boyd | 48447 | 1.08 |
| Boyle | 30469 | 0.68 |
| Bracken | 8394 | 0.19 |
| Breathitt | 13652 | 0.30 |
| Breckinridge | 20345 | 0.45 |
| Bullitt | 81729 | 1.82 |
| Butler | 12413 | 0.28 |
| Caldwell | 12641 | 0.28 |
| Calloway | 37291 | 0.83 |
| Campbell | 93023 | 2.07 |
| Carlisle | 4821 | 0.11 |
| Carroll | 10808 | 0.24 |
| Carter | 26820 | 0.60 |
| Casey | 15863 | 0.35 |
| Christian | 72377 | 1.61 |
| Clark | 36716 | 0.82 |
| Clay | 20484 | 0.46 |
| Clinton | 9372 | 0.21 |
| Crittenden | 8997 | 0.20 |
| Cumberland | 6023 | 0.13 |
| Daviess | 102488 | 2.28 |
| Edmonson | 12165 | 0.27 |
| Elliott | 7414 | 0.17 |
| Estill | 14157 | 0.32 |
| Fayette | 321354 | 7.15 |
| Fleming | 14996 | 0.33 |
| Floyd | 36127 | 0.80 |
| Franklin | 51319 | 1.14 |
| Fulton | 6507 | 0.14 |
| Gallatin | 8694 | 0.19 |
| Garrard | 17018 | 0.38 |
| Grant | 24918 | 0.55 |
| Graves | 36796 | 0.82 |
| Grayson | 26351 | 0.59 |
| Green | 11141 | 0.25 |
| Greenup | 35996 | 0.80 |
| Hancock | 9050 | 0.20 |
| Hardin | 110134 | 2.45 |
| Harlan | 26921 | 0.60 |
| Harrison | 18690 | 0.42 |
| Hart | 19194 | 0.43 |
| Henderson | 45102 | 1.00 |
| Henry | 15691 | 0.35 |
| Hickman | 4529 | 0.10 |
| Hopkins | 45432 | 1.01 |
| Jackson | 13029 | 0.29 |
| Jefferson | 780449 | 17.37 |
| Jessamine | 53016 | 1.18 |
| Johnson | 22794 | 0.51 |
| Kenton | 168264 | 3.74 |
| Knott | 14506 | 0.32 |
| Knox | 30367 | 0.68 |
| Larue | 14768 | 0.33 |
| Laurel | 62090 | 1.38 |
| Lawrence | 16274 | 0.36 |
| Lee | 7263 | 0.16 |
| Leslie | 10622 | 0.24 |
| Letcher | 21784 | 0.49 |
| Lewis | 13103 | 0.29 |
| Lincoln | 24314 | 0.54 |
| Livingston | 8989 | 0.20 |
| Logan | 27319 | 0.61 |
| Lyon | 8700 | 0.19 |
| McCracken | 67394 | 1.50 |
| McCreary | 17044 | 0.38 |
| McLean | 9182 | 0.20 |
| Madison | 92194 | 2.05 |
| Magoffin | 11818 | 0.26 |
| Marion | 19556 | 0.44 |
| Marshall | 31662 | 0.71 |
| Martin | 11394 | 0.25 |
| Mason | 17103 | 0.38 |
| Meade | 29735 | 0.66 |
| Menifee | 6149 | 0.14 |
| Mercer | 22470 | 0.50 |
| Metcalfe | 10275 | 0.23 |
| Monroe | 11269 | 0.25 |
| Montgomery | 28084 | 0.63 |
| Morgan | 13772 | 0.31 |
| Muhlenberg | 31011 | 0.69 |
| Nelson | 46440 | 1.03 |
| Nicholas | 7517 | 0.17 |
| Ohio | 23861 | 0.53 |
| Oldham | 67586 | 1.50 |
| Owen | 11160 | 0.25 |
| Owsley | 4094 | 0.09 |
| Pendleton | 14625 | 0.33 |
| Perry | 28421 | 0.63 |
| Pike | 58914 | 1.31 |
| Powell | 13050 | 0.29 |
| Pulaski | 64717 | 1.44 |
| Robertson | 2196 | 0.05 |
| Rockcastle | 16167 | 0.36 |
| Rowan | 24654 | 0.55 |
| Russell | 17909 | 0.40 |
| Scott | 56267 | 1.25 |
| Shelby | 47523 | 1.06 |
| Simpson | 19324 | 0.43 |
| Spencer | 19256 | 0.43 |
| Taylor | 25948 | 0.58 |
| Todd | 12206 | 0.27 |
| Trigg | 14067 | 0.31 |
| Trimble | 8502 | 0.19 |
| Union | 13786 | 0.31 |
| Warren | 133216 | 2.96 |
| Washington | 11957 | 0.27 |
| Wayne | 19743 | 0.44 |
| Webster | 12994 | 0.29 |
| Whitley | 36578 | 0.81 |
| Wolfe | 6666 | 0.15 |
| Woodford | 26758 | 0.60 |