The list is the FIPS codes of Kentucky counties. All the FIPS codes are starting with 21.
| County | FIPS Code |
| Adair | 21001 |
| Allen | 21003 |
| Anderson | 21005 |
| Ballard | 21007 |
| Barren | 21009 |
| Bath | 21011 |
| Bell | 21013 |
| Boone | 21015 |
| Bourbon | 21017 |
| Boyd | 21019 |
| Boyle | 21021 |
| Bracken | 21023 |
| Breathitt | 21025 |
| Breckinridge | 21027 |
| Bullitt | 21029 |
| Butler | 21031 |
| Caldwell | 21033 |
| Calloway | 21035 |
| Campbell | 21037 |
| Carlisle | 21039 |
| Carroll | 21041 |
| Carter | 21043 |
| Casey | 21045 |
| Christian | 21047 |
| Clark | 21049 |
| Clay | 21051 |
| Clinton | 21053 |
| Crittenden | 21055 |
| Cumberland | 21057 |
| Daviess | 21059 |
| Edmonson | 21061 |
| Elliott | 21063 |
| Estill | 21065 |
| Fayette | 21067 |
| Fleming | 21069 |
| Floyd | 21071 |
| Franklin | 21073 |
| Fulton | 21075 |
| Gallatin | 21077 |
| Garrard | 21079 |
| Grant | 21081 |
| Graves | 21083 |
| Grayson | 21085 |
| Green | 21087 |
| Greenup | 21089 |
| Hancock | 21091 |
| Hardin | 21093 |
| Harlan | 21095 |
| Harrison | 21097 |
| Hart | 21099 |
| Henderson | 21101 |
| Henry | 21103 |
| Hickman | 21105 |
| Hopkins | 21107 |
| Jackson | 21109 |
| Jefferson | 21111 |
| Jessamine | 21113 |
| Johnson | 21115 |
| Kenton | 21117 |
| Knott | 21119 |
| Knox | 21121 |
| Larue | 21123 |
| Laurel | 21125 |
| Lawrence | 21127 |
| Lee | 21129 |
| Leslie | 21131 |
| Letcher | 21133 |
| Lewis | 21135 |
| Lincoln | 21137 |
| Livingston | 21139 |
| Logan | 21141 |
| Lyon | 21143 |
| Madison | 21151 |
| Magoffin | 21153 |
| Marion | 21155 |
| Marshall | 21157 |
| Martin | 21159 |
| Mason | 21161 |
| McCracken | 21145 |
| McCreary | 21147 |
| McLean | 21149 |
| Meade | 21163 |
| Menifee | 21165 |
| Mercer | 21167 |
| Metcalfe | 21169 |
| Monroe | 21171 |
| Montgomery | 21173 |
| Morgan | 21175 |
| Muhlenberg | 21177 |
| Nelson | 21179 |
| Nicholas | 21181 |
| Ohio | 21183 |
| Oldham | 21185 |
| Owen | 21187 |
| Owsley | 21189 |
| Pendleton | 21191 |
| Perry | 21193 |
| Pike | 21195 |
| Powell | 21197 |
| Pulaski | 21199 |
| Robertson | 21201 |
| Rockcastle | 21203 |
| Rowan | 21205 |
| Russell | 21207 |
| Scott | 21209 |
| Shelby | 21211 |
| Simpson | 21213 |
| Spencer | 21215 |
| Taylor | 21217 |
| Todd | 21219 |
| Trigg | 21221 |
| Trimble | 21223 |
| Union | 21225 |
| Warren | 21227 |
| Washington | 21229 |
| Wayne | 21231 |
| Webster | 21233 |
| Whitley | 21235 |
| Wolfe | 21237 |
| Woodford | 21239 |
All codes are cited from United States Department of Agriculture [28].