FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
|---|
| 55001 | WI | Adams County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 18,643 |
| 55003 | WI | Ashland County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 16,866 |
| 55005 | WI | Barron County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 44,963 |
| 55007 | WI | Bayfield County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 15,013 |
| 55009 | WI | Brown County | 2 | Small-in a metro area with fewer than 1 million residents | 226,778 |
| 55011 | WI | Buffalo County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 13,804 |
| 55013 | WI | Burnett County | 4 | Noncore adjacent to a large metro area | 15,674 |
| 55015 | WI | Calumet County | 2 | Small-in a metro area with fewer than 1 million residents | 40,631 |
| 55017 | WI | Chippewa County | 2 | Small-in a metro area with fewer than 1 million residents | 55,195 |
| 55019 | WI | Clark County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 33,557 |
| 55021 | WI | Columbia County | 2 | Small-in a metro area with fewer than 1 million residents | 52,468 |
| 55023 | WI | Crawford County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 17,243 |
| 55025 | WI | Dane County | 2 | Small-in a metro area with fewer than 1 million residents | 426,526 |
| 55027 | WI | Dodge County | 3 | Micropolitan adjacent to a large metro area | 85,897 |
| 55029 | WI | Door County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 27,961 |
| 55031 | WI | Douglas County | 2 | Small-in a metro area with fewer than 1 million residents | 43,287 |
| 55033 | WI | Dunn County | 5 | Micropolitan adjacent to a small metro area | 39,858 |
| 55035 | WI | Eau Claire County | 2 | Small-in a metro area with fewer than 1 million residents | 93,142 |
| 55037 | WI | Florence County | 8 | Micropolitan not adjacent to a metro area | 5,088 |
| 55039 | WI | Fond du Lac County | 2 | Small-in a metro area with fewer than 1 million residents | 97,296 |
| 55041 | WI | Forest County | 10 | Noncore adjacent to micro area and does not contain a town of at least 2,500 residents | 10,024 |
| 55043 | WI | Grant County | 5 | Micropolitan adjacent to a small metro area | 49,597 |
| 55045 | WI | Green County | 5 | Micropolitan adjacent to a small metro area | 33,647 |
| 55047 | WI | Green Lake County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 19,105 |
| 55049 | WI | Iowa County | 2 | Small-in a metro area with fewer than 1 million residents | 22,780 |
| 55051 | WI | Iron County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 6,861 |
| 55053 | WI | Jackson County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 19,100 |
| 55055 | WI | Jefferson County | 3 | Micropolitan adjacent to a large metro area | 74,021 |
| 55057 | WI | Juneau County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 24,316 |
| 55059 | WI | Kenosha County | 1 | Large-in a metro area with at least 1 million residents or more | 149,577 |
| 55061 | WI | Kewaunee County | 2 | Small-in a metro area with fewer than 1 million residents | 20,187 |
| 55063 | WI | La Crosse County | 2 | Small-in a metro area with fewer than 1 million residents | 107,120 |
| 55065 | WI | Lafayette County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 16,137 |
| 55067 | WI | Langlade County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 20,740 |
| 55069 | WI | Lincoln County | 5 | Micropolitan adjacent to a small metro area | 29,641 |
| 55071 | WI | Manitowoc County | 5 | Micropolitan adjacent to a small metro area | 82,887 |
| 55073 | WI | Marathon County | 2 | Small-in a metro area with fewer than 1 million residents | 125,834 |
| 55075 | WI | Marinette County | 5 | Micropolitan adjacent to a small metro area | 43,384 |
| 55077 | WI | Marquette County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 15,832 |
| 55078 | WI | Menominee County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 4,562 |
| 55079 | WI | Milwaukee County | 1 | Large-in a metro area with at least 1 million residents or more | 940,164 |
| 55081 | WI | Monroe County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 40,899 |
| 55083 | WI | Oconto County | 2 | Small-in a metro area with fewer than 1 million residents | 35,634 |
| 55085 | WI | Oneida County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 36,776 |
| 55087 | WI | Outagamie County | 2 | Small-in a metro area with fewer than 1 million residents | 160,971 |
| 55089 | WI | Ozaukee County | 1 | Large-in a metro area with at least 1 million residents or more | 82,317 |
| 55091 | WI | Pepin County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 7,213 |
| 55093 | WI | Pierce County | 1 | Large-in a metro area with at least 1 million residents or more | 36,804 |
| 55095 | WI | Polk County | 4 | Noncore adjacent to a large metro area | 41,319 |
| 55097 | WI | Portage County | 5 | Micropolitan adjacent to a small metro area | 67,182 |
| 55099 | WI | Price County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 15,822 |
| 55101 | WI | Racine County | 2 | Small-in a metro area with fewer than 1 million residents | 188,831 |
| 55103 | WI | Richland County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 17,924 |
| 55105 | WI | Rock County | 2 | Small-in a metro area with fewer than 1 million residents | 152,307 |
| 55107 | WI | Rusk County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 15,347 |
| 55109 | WI | St. Croix County | 1 | Large-in a metro area with at least 1 million residents or more | 63,155 |
| 55111 | WI | Sauk County | 5 | Micropolitan adjacent to a small metro area | 55,225 |
| 55113 | WI | Sawyer County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 16,196 |
| 55115 | WI | Shawano County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 40,664 |
| 55117 | WI | Sheboygan County | 2 | Small-in a metro area with fewer than 1 million residents | 112,646 |
| 55119 | WI | Taylor County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 19,680 |
| 55121 | WI | Trempealeau County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 27,010 |
| 55123 | WI | Vernon County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 28,056 |
| 55125 | WI | Vilas County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 21,033 |
| 55127 | WI | Walworth County | 3 | Micropolitan adjacent to a large metro area | 93,759 |
| 55129 | WI | Washburn County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 16,036 |
| 55131 | WI | Washington County | 1 | Large-in a metro area with at least 1 million residents or more | 117,493 |
| 55133 | WI | Waukesha County | 1 | Large-in a metro area with at least 1 million residents or more | 360,767 |
| 55135 | WI | Waupaca County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 51,731 |
| 55137 | WI | Waushara County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 23,154 |
| 55139 | WI | Winnebago County | 2 | Small-in a metro area with fewer than 1 million residents | 156,763 |
| 55141 | WI | Wood County | 5 | Micropolitan adjacent to a small metro area | 75,555 |