FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
|---|
| 21001 | KY | Adair County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 17,244 |
| 21003 | KY | Allen County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 17,800 |
| 21005 | KY | Anderson County | 5 | Micropolitan adjacent to a small metro area | 19,111 |
| 21007 | KY | Ballard County | 8 | Micropolitan not adjacent to a metro area | 8,286 |
| 21009 | KY | Barren County | 5 | Micropolitan adjacent to a small metro area | 38,033 |
| 21011 | KY | Bath County | 5 | Micropolitan adjacent to a small metro area | 11,085 |
| 21013 | KY | Bell County | 8 | Micropolitan not adjacent to a metro area | 30,060 |
| 21015 | KY | Boone County | 1 | Large-in a metro area with at least 1 million residents or more | 85,991 |
| 21017 | KY | Bourbon County | 2 | Small-in a metro area with fewer than 1 million residents | 19,360 |
| 21019 | KY | Boyd County | 2 | Small-in a metro area with fewer than 1 million residents | 49,752 |
| 21021 | KY | Boyle County | 8 | Micropolitan not adjacent to a metro area | 27,697 |
| 21023 | KY | Bracken County | 1 | Large-in a metro area with at least 1 million residents or more | 8,279 |
| 21025 | KY | Breathitt County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 16,100 |
| 21027 | KY | Breckinridge County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 18,648 |
| 21029 | KY | Bullitt County | 1 | Large-in a metro area with at least 1 million residents or more | 61,236 |
| 21031 | KY | Butler County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 13,010 |
| 21033 | KY | Caldwell County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 13,060 |
| 21035 | KY | Calloway County | 8 | Micropolitan not adjacent to a metro area | 34,177 |
| 21037 | KY | Campbell County | 1 | Large-in a metro area with at least 1 million residents or more | 88,616 |
| 21039 | KY | Carlisle County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 5,351 |
| 21041 | KY | Carroll County | 4 | Noncore adjacent to a large metro area | 10,155 |
| 21043 | KY | Carter County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 26,889 |
| 21045 | KY | Casey County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 15,447 |
| 21047 | KY | Christian County | 2 | Small-in a metro area with fewer than 1 million residents | 72,265 |
| 21049 | KY | Clark County | 2 | Small-in a metro area with fewer than 1 million residents | 33,144 |
| 21051 | KY | Clay County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 24,556 |
| 21053 | KY | Clinton County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 9,634 |
| 21055 | KY | Crittenden County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 9,384 |
| 21057 | KY | Cumberland County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 7,147 |
| 21059 | KY | Daviess County | 2 | Small-in a metro area with fewer than 1 million residents | 91,545 |
| 21061 | KY | Edmonson County | 2 | Small-in a metro area with fewer than 1 million residents | 11,644 |
| 21063 | KY | Elliott County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 6,748 |
| 21065 | KY | Estill County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 15,307 |
| 21067 | KY | Fayette County | 2 | Small-in a metro area with fewer than 1 million residents | 260,512 |
| 21069 | KY | Fleming County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 13,792 |
| 21071 | KY | Floyd County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 42,441 |
| 21073 | KY | Franklin County | 5 | Micropolitan adjacent to a small metro area | 47,687 |
| 21075 | KY | Fulton County | 8 | Micropolitan not adjacent to a metro area | 7,752 |
| 21077 | KY | Gallatin County | 1 | Large-in a metro area with at least 1 million residents or more | 7,870 |
| 21079 | KY | Garrard County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 14,792 |
| 21081 | KY | Grant County | 1 | Large-in a metro area with at least 1 million residents or more | 22,384 |
| 21083 | KY | Graves County | 8 | Micropolitan not adjacent to a metro area | 37,028 |
| 21085 | KY | Grayson County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 24,053 |
| 21087 | KY | Green County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 11,518 |
| 21089 | KY | Greenup County | 2 | Small-in a metro area with fewer than 1 million residents | 36,891 |
| 21091 | KY | Hancock County | 2 | Small-in a metro area with fewer than 1 million residents | 8,392 |
| 21093 | KY | Hardin County | 2 | Small-in a metro area with fewer than 1 million residents | 94,174 |
| 21095 | KY | Harlan County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 33,202 |
| 21097 | KY | Harrison County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 17,983 |
| 21099 | KY | Hart County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 17,445 |
| 21101 | KY | Henderson County | 2 | Small-in a metro area with fewer than 1 million residents | 44,829 |
| 21103 | KY | Henry County | 1 | Large-in a metro area with at least 1 million residents or more | 15,060 |
| 21105 | KY | Hickman County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 5,262 |
| 21107 | KY | Hopkins County | 5 | Micropolitan adjacent to a small metro area | 46,519 |
| 21109 | KY | Jackson County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 13,495 |
| 21111 | KY | Jefferson County | 1 | Large-in a metro area with at least 1 million residents or more | 693,604 |
| 21113 | KY | Jessamine County | 2 | Small-in a metro area with fewer than 1 million residents | 39,041 |
| 21115 | KY | Johnson County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 23,445 |
| 21117 | KY | Kenton County | 1 | Large-in a metro area with at least 1 million residents or more | 151,464 |
| 21119 | KY | Knott County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 17,649 |
| 21121 | KY | Knox County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 31,795 |
| 21123 | KY | Larue County | 2 | Small-in a metro area with fewer than 1 million residents | 13,373 |
| 21125 | KY | Laurel County | 8 | Micropolitan not adjacent to a metro area | 52,715 |
| 21127 | KY | Lawrence County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 15,569 |
| 21129 | KY | Lee County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 7,916 |
| 21131 | KY | Leslie County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 12,401 |
| 21133 | KY | Letcher County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 25,277 |
| 21135 | KY | Lewis County | 5 | Micropolitan adjacent to a small metro area | 14,092 |
| 21137 | KY | Lincoln County | 8 | Micropolitan not adjacent to a metro area | 23,361 |
| 21139 | KY | Livingston County | 8 | Micropolitan not adjacent to a metro area | 9,804 |
| 21141 | KY | Logan County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 26,573 |
| 21143 | KY | Lyon County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 8,080 |
| 21145 | KY | McCracken County | 8 | Micropolitan not adjacent to a metro area | 65,514 |
| 21147 | KY | McCreary County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 17,080 |
| 21149 | KY | McLean County | 2 | Small-in a metro area with fewer than 1 million residents | 9,938 |
| 21151 | KY | Madison County | 5 | Micropolitan adjacent to a small metro area | 70,872 |
| 21153 | KY | Magoffin County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 13,332 |
| 21155 | KY | Marion County | 4 | Noncore adjacent to a large metro area | 18,212 |
| 21157 | KY | Marshall County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 30,125 |
| 21159 | KY | Martin County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 12,578 |
| 21161 | KY | Mason County | 3 | Micropolitan adjacent to a large metro area | 16,800 |
| 21163 | KY | Meade County | 1 | Large-in a metro area with at least 1 million residents or more | 26,349 |
| 21165 | KY | Menifee County | 8 | Micropolitan not adjacent to a metro area | 6,556 |
| 21167 | KY | Mercer County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 20,817 |
| 21169 | KY | Metcalfe County | 8 | Micropolitan not adjacent to a metro area | 10,037 |
| 21171 | KY | Monroe County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 11,756 |
| 21173 | KY | Montgomery County | 5 | Micropolitan adjacent to a small metro area | 22,554 |
| 21175 | KY | Morgan County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 13,948 |
| 21177 | KY | Muhlenberg County | 5 | Micropolitan adjacent to a small metro area | 31,839 |
| 21179 | KY | Nelson County | 1 | Large-in a metro area with at least 1 million residents or more | 37,477 |
| 21181 | KY | Nicholas County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 6,813 |
| 21183 | KY | Ohio County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 22,916 |
| 21185 | KY | Oldham County | 1 | Large-in a metro area with at least 1 million residents or more | 46,178 |
| 21187 | KY | Owen County | 4 | Noncore adjacent to a large metro area | 10,547 |
| 21189 | KY | Owsley County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 4,858 |
| 21191 | KY | Pendleton County | 1 | Large-in a metro area with at least 1 million residents or more | 14,390 |
| 21193 | KY | Perry County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 29,390 |
| 21195 | KY | Pike County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 68,736 |
| 21197 | KY | Powell County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 13,237 |
| 21199 | KY | Pulaski County | 8 | Micropolitan not adjacent to a metro area | 56,217 |
| 21201 | KY | Robertson County | 4 | Noncore adjacent to a large metro area | 2,266 |
| 21203 | KY | Rockcastle County | 8 | Micropolitan not adjacent to a metro area | 16,582 |
| 21205 | KY | Rowan County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 22,094 |
| 21207 | KY | Russell County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 16,315 |
| 21209 | KY | Scott County | 2 | Small-in a metro area with fewer than 1 million residents | 33,061 |
| 21211 | KY | Shelby County | 1 | Large-in a metro area with at least 1 million residents or more | 33,337 |
| 21213 | KY | Simpson County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 16,405 |
| 21215 | KY | Spencer County | 1 | Large-in a metro area with at least 1 million residents or more | 11,766 |
| 21217 | KY | Taylor County | 8 | Micropolitan not adjacent to a metro area | 22,927 |
| 21219 | KY | Todd County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 11,971 |
| 21221 | KY | Trigg County | 2 | Small-in a metro area with fewer than 1 million residents | 12,597 |
| 21223 | KY | Trimble County | 1 | Large-in a metro area with at least 1 million residents or more | 8,125 |
| 21225 | KY | Union County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 15,637 |
| 21227 | KY | Warren County | 2 | Small-in a metro area with fewer than 1 million residents | 92,522 |
| 21229 | KY | Washington County | 4 | Noncore adjacent to a large metro area | 10,916 |
| 21231 | KY | Wayne County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 19,923 |
| 21233 | KY | Webster County | 2 | Small-in a metro area with fewer than 1 million residents | 14,120 |
| 21235 | KY | Whitley County | 8 | Micropolitan not adjacent to a metro area | 35,865 |
| 21237 | KY | Wolfe County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 7,065 |
| 21239 | KY | Woodford County | 2 | Small-in a metro area with fewer than 1 million residents | 23,208 |