FIPS
Code | State | County name | 2003 urban
influence code | Description | 2000 population |
|---|
| 18001 | IN | Adams County | 5 | Micropolitan adjacent to a small metro area | 33,625 |
| 18003 | IN | Allen County | 2 | Small-in a metro area with fewer than 1 million residents | 331,849 |
| 18005 | IN | Bartholomew County | 2 | Small-in a metro area with fewer than 1 million residents | 71,435 |
| 18007 | IN | Benton County | 2 | Small-in a metro area with fewer than 1 million residents | 9,421 |
| 18009 | IN | Blackford County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 14,048 |
| 18011 | IN | Boone County | 1 | Large-in a metro area with at least 1 million residents or more | 46,107 |
| 18013 | IN | Brown County | 1 | Large-in a metro area with at least 1 million residents or more | 14,957 |
| 18015 | IN | Carroll County | 2 | Small-in a metro area with fewer than 1 million residents | 20,165 |
| 18017 | IN | Cass County | 5 | Micropolitan adjacent to a small metro area | 40,930 |
| 18019 | IN | Clark County | 1 | Large-in a metro area with at least 1 million residents or more | 96,472 |
| 18021 | IN | Clay County | 2 | Small-in a metro area with fewer than 1 million residents | 26,556 |
| 18023 | IN | Clinton County | 5 | Micropolitan adjacent to a small metro area | 33,866 |
| 18025 | IN | Crawford County | 4 | Noncore adjacent to a large metro area | 10,743 |
| 18027 | IN | Daviess County | 8 | Micropolitan not adjacent to a metro area | 29,820 |
| 18029 | IN | Dearborn County | 1 | Large-in a metro area with at least 1 million residents or more | 46,109 |
| 18031 | IN | Decatur County | 3 | Micropolitan adjacent to a large metro area | 24,555 |
| 18033 | IN | DeKalb County | 5 | Micropolitan adjacent to a small metro area | 40,285 |
| 18035 | IN | Delaware County | 2 | Small-in a metro area with fewer than 1 million residents | 118,769 |
| 18037 | IN | Dubois County | 8 | Micropolitan not adjacent to a metro area | 39,674 |
| 18039 | IN | Elkhart County | 2 | Small-in a metro area with fewer than 1 million residents | 182,791 |
| 18041 | IN | Fayette County | 8 | Micropolitan not adjacent to a metro area | 25,588 |
| 18043 | IN | Floyd County | 1 | Large-in a metro area with at least 1 million residents or more | 70,823 |
| 18045 | IN | Fountain County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 17,954 |
| 18047 | IN | Franklin County | 1 | Large-in a metro area with at least 1 million residents or more | 22,151 |
| 18049 | IN | Fulton County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 20,511 |
| 18051 | IN | Gibson County | 2 | Small-in a metro area with fewer than 1 million residents | 32,500 |
| 18053 | IN | Grant County | 5 | Micropolitan adjacent to a small metro area | 73,403 |
| 18055 | IN | Greene County | 2 | Small-in a metro area with fewer than 1 million residents | 33,157 |
| 18057 | IN | Hamilton County | 1 | Large-in a metro area with at least 1 million residents or more | 182,740 |
| 18059 | IN | Hancock County | 1 | Large-in a metro area with at least 1 million residents or more | 55,391 |
| 18061 | IN | Harrison County | 1 | Large-in a metro area with at least 1 million residents or more | 34,325 |
| 18063 | IN | Hendricks County | 1 | Large-in a metro area with at least 1 million residents or more | 104,093 |
| 18065 | IN | Henry County | 3 | Micropolitan adjacent to a large metro area | 48,508 |
| 18067 | IN | Howard County | 2 | Small-in a metro area with fewer than 1 million residents | 84,964 |
| 18069 | IN | Huntington County | 5 | Micropolitan adjacent to a small metro area | 38,075 |
| 18071 | IN | Jackson County | 5 | Micropolitan adjacent to a small metro area | 41,335 |
| 18073 | IN | Jasper County | 1 | Large-in a metro area with at least 1 million residents or more | 30,043 |
| 18075 | IN | Jay County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 21,806 |
| 18077 | IN | Jefferson County | 3 | Micropolitan adjacent to a large metro area | 31,705 |
| 18079 | IN | Jennings County | 5 | Micropolitan adjacent to a small metro area | 27,554 |
| 18081 | IN | Johnson County | 1 | Large-in a metro area with at least 1 million residents or more | 115,209 |
| 18083 | IN | Knox County | 5 | Micropolitan adjacent to a small metro area | 39,256 |
| 18085 | IN | Kosciusko County | 5 | Micropolitan adjacent to a small metro area | 74,057 |
| 18087 | IN | LaGrange County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 34,909 |
| 18089 | IN | Lake County | 1 | Large-in a metro area with at least 1 million residents or more | 484,564 |
| 18091 | IN | LaPorte County | 2 | Small-in a metro area with fewer than 1 million residents | 110,106 |
| 18093 | IN | Lawrence County | 5 | Micropolitan adjacent to a small metro area | 45,922 |
| 18095 | IN | Madison County | 2 | Small-in a metro area with fewer than 1 million residents | 133,358 |
| 18097 | IN | Marion County | 1 | Large-in a metro area with at least 1 million residents or more | 860,454 |
| 18099 | IN | Marshall County | 5 | Micropolitan adjacent to a small metro area | 45,128 |
| 18101 | IN | Martin County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 10,369 |
| 18103 | IN | Miami County | 5 | Micropolitan adjacent to a small metro area | 36,082 |
| 18105 | IN | Monroe County | 2 | Small-in a metro area with fewer than 1 million residents | 120,563 |
| 18107 | IN | Montgomery County | 3 | Micropolitan adjacent to a large metro area | 37,629 |
| 18109 | IN | Morgan County | 1 | Large-in a metro area with at least 1 million residents or more | 66,689 |
| 18111 | IN | Newton County | 1 | Large-in a metro area with at least 1 million residents or more | 14,566 |
| 18113 | IN | Noble County | 5 | Micropolitan adjacent to a small metro area | 46,275 |
| 18115 | IN | Ohio County | 1 | Large-in a metro area with at least 1 million residents or more | 5,623 |
| 18117 | IN | Orange County | 4 | Noncore adjacent to a large metro area | 19,306 |
| 18119 | IN | Owen County | 2 | Small-in a metro area with fewer than 1 million residents | 21,786 |
| 18121 | IN | Parke County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 17,241 |
| 18123 | IN | Perry County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 18,899 |
| 18125 | IN | Pike County | 5 | Micropolitan adjacent to a small metro area | 12,837 |
| 18127 | IN | Porter County | 1 | Large-in a metro area with at least 1 million residents or more | 146,798 |
| 18129 | IN | Posey County | 2 | Small-in a metro area with fewer than 1 million residents | 27,061 |
| 18131 | IN | Pulaski County | 4 | Noncore adjacent to a large metro area | 13,755 |
| 18133 | IN | Putnam County | 1 | Large-in a metro area with at least 1 million residents or more | 36,019 |
| 18135 | IN | Randolph County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 27,401 |
| 18137 | IN | Ripley County | 4 | Noncore adjacent to a large metro area | 26,523 |
| 18139 | IN | Rush County | 4 | Noncore adjacent to a large metro area | 18,261 |
| 18141 | IN | St. Joseph County | 2 | Small-in a metro area with fewer than 1 million residents | 265,559 |
| 18143 | IN | Scott County | 3 | Micropolitan adjacent to a large metro area | 22,960 |
| 18145 | IN | Shelby County | 1 | Large-in a metro area with at least 1 million residents or more | 43,445 |
| 18147 | IN | Spencer County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 20,391 |
| 18149 | IN | Starke County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 23,556 |
| 18151 | IN | Steuben County | 8 | Micropolitan not adjacent to a metro area | 33,214 |
| 18153 | IN | Sullivan County | 2 | Small-in a metro area with fewer than 1 million residents | 21,751 |
| 18155 | IN | Switzerland County | 4 | Noncore adjacent to a large metro area | 9,065 |
| 18157 | IN | Tippecanoe County | 2 | Small-in a metro area with fewer than 1 million residents | 148,955 |
| 18159 | IN | Tipton County | 2 | Small-in a metro area with fewer than 1 million residents | 16,577 |
| 18161 | IN | Union County | 4 | Noncore adjacent to a large metro area | 7,349 |
| 18163 | IN | Vanderburgh County | 2 | Small-in a metro area with fewer than 1 million residents | 171,922 |
| 18165 | IN | Vermillion County | 2 | Small-in a metro area with fewer than 1 million residents | 16,788 |
| 18167 | IN | Vigo County | 2 | Small-in a metro area with fewer than 1 million residents | 105,848 |
| 18169 | IN | Wabash County | 5 | Micropolitan adjacent to a small metro area | 34,960 |
| 18171 | IN | Warren County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 8,419 |
| 18173 | IN | Warrick County | 2 | Small-in a metro area with fewer than 1 million residents | 52,383 |
| 18175 | IN | Washington County | 1 | Large-in a metro area with at least 1 million residents or more | 27,223 |
| 18177 | IN | Wayne County | 8 | Micropolitan not adjacent to a metro area | 71,097 |
| 18179 | IN | Wells County | 2 | Small-in a metro area with fewer than 1 million residents | 27,600 |
| 18181 | IN | White County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 25,267 |
| 18183 | IN | Whitley County | 2 | Small-in a metro area with fewer than 1 million residents | 30,707 |
