*These data are provisional and may be revised or adjusted in the future.
Cumulative Mosquito Infections by County - Montana, 2005
| Custer County | 1 |
| Lewis and Clark County | 1 |
| Prairie County | 2 |
| Roosevelt County | 3 |
| Sheridan County | 6 |
| Valley County | 2 |
Cumulative Total Entire State: 15