FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
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| 30001 | MT | Beaverhead County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 9,202 | | 30003 | MT | Big Horn County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 12,671 | | 30005 | MT | Blaine County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 7,009 | | 30007 | MT | Broadwater County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 4,385 | | 30009 | MT | Carbon County | 2 | Small-in a metro area with fewer than 1 million residents | 9,552 | | 30011 | MT | Carter County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,360 | | 30013 | MT | Cascade County | 2 | Small-in a metro area with fewer than 1 million residents | 80,357 | | 30015 | MT | Chouteau County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 5,970 | | 30017 | MT | Custer County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 11,696 | | 30019 | MT | Daniels County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 2,017 | | 30021 | MT | Dawson County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 9,059 | | 30023 | MT | Deer Lodge County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 9,417 | | 30025 | MT | Fallon County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 2,837 | | 30027 | MT | Fergus County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 11,893 | | 30029 | MT | Flathead County | 8 | Micropolitan not adjacent to a metro area | 74,471 | | 30031 | MT | Gallatin County | 8 | Micropolitan not adjacent to a metro area | 67,831 | | 30033 | MT | Garfield County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,279 | | 30035 | MT | Glacier County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 13,247 | | 30037 | MT | Golden Valley County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 1,042 | | 30039 | MT | Granite County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 2,830 | | 30041 | MT | Hill County | 8 | Micropolitan not adjacent to a metro area | 16,673 | | 30043 | MT | Jefferson County | 8 | Micropolitan not adjacent to a metro area | 10,049 | | 30045 | MT | Judith Basin County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 2,329 | | 30047 | MT | Lake County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 26,507 | | 30049 | MT | Lewis and Clark County | 8 | Micropolitan not adjacent to a metro area | 55,716 | | 30051 | MT | Liberty County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 2,158 | | 30053 | MT | Lincoln County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 18,837 | | 30055 | MT | McCone County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,977 | | 30057 | MT | Madison County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 6,851 | | 30059 | MT | Meagher County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 1,932 | | 30061 | MT | Mineral County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 3,884 | | 30063 | MT | Missoula County | 2 | Small-in a metro area with fewer than 1 million residents | 95,802 | | 30065 | MT | Musselshell County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 4,497 | | 30067 | MT | Park County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 15,694 | | 30069 | MT | Petroleum County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 493 | | 30071 | MT | Phillips County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 4,601 | | 30073 | MT | Pondera County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 6,424 | | 30075 | MT | Powder River County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,858 | | 30077 | MT | Powell County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 7,180 | | 30079 | MT | Prairie County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,199 | | 30081 | MT | Ravalli County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 36,070 | | 30083 | MT | Richland County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 9,667 | | 30085 | MT | Roosevelt County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 10,620 | | 30087 | MT | Rosebud County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 9,383 | | 30089 | MT | Sanders County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 10,227 | | 30091 | MT | Sheridan County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 4,105 | | 30093 | MT | Silver Bow County | 8 | Micropolitan not adjacent to a metro area | 34,606 | | 30095 | MT | Stillwater County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 8,195 | | 30097 | MT | Sweet Grass County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 3,609 | | 30099 | MT | Teton County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 6,445 | | 30101 | MT | Toole County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 5,267 | | 30103 | MT | Treasure County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 861 | | 30105 | MT | Valley County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 7,675 | | 30107 | MT | Wheatland County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 2,259 | | 30109 | MT | Wibaux County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 1,068 | | 30111 | MT | Yellowstone County | 2 | Small-in a metro area with fewer than 1 million residents | 129,352 |
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