*These data are provisional and may be revised or adjusted in the future.
Cumulative Human Disease Cases by County - Colorado, 2003
| Adams County | 232 |
| Alamosa County | 3 |
| Arapahoe County | 138 |
| Baca County | 5 |
| Bent County | 7 |
| Boulder County | 421 |
| Broomfield County | 55 |
| Chaffee County | 7 |
| Cheyenne County | 4 |
| Clear Creek County | 1 |
| Conejos County | 1 |
| Crowley County | 4 |
| Delta County | 10 |
| Denver County | 162 |
| Douglas County | 39 |
| Eagle County | 1 |
| El Paso County | 114 |
| Elbert County | 8 |
| Fremont County | 77 |
| Garfield County | 2 |
| Grand County | 1 |
| Huerfano County | 10 |
| Jefferson County | 157 |
| Kiowa County | 1 |
| Kit Carson County | 5 |
| La Plata County | 14 |
| Larimer County | 546 |
| Las Animas County | 7 |
| Lincoln County | 8 |
| Logan County | 84 |
| Mesa County | 19 |
| Moffat County | 2 |
| Montezuma County | 5 |
| Montrose County | 9 |
| Morgan County | 61 |
| Otero County | 28 |
| Park County | 1 |
| Phillips County | 23 |
| Prowers County | 42 |
| Pueblo County | 183 |
| Rio Grande County | 3 |
| Saguache County | 2 |
| Sedgwick County | 13 |
| Summit County | 3 |
| Washington County | 10 |
| Weld County | 402 |
| Yuma County | 17 |