| Species | Sites Reporting | Year |
|---|---|---|
| Monarch | 11 | 1990 |
| Cabbage White | 11 | 1990 |
| Common/Orange Sulphur | 11 | 1990 |
| Eastern Tailed Blue | 10 | 1990 |
| Black Swallowtail | 10 | 1990 |
| Red Admiral | 9 | 1990 |
| Question Mark | 9 | 1990 |
| European Skipper | 8 | 1990 |
| Pearl Crescent | 8 | 1990 |
| Mourning Cloak | 8 | 1990 |
| Spring/Summer Azure | 6 | 1990 |
| Eastern Tiger Swallowtail | 6 | 1990 |
| Great Spangled Fritillary | 6 | 1990 |
| Little Wood Satyr | 5 | 1990 |
| Eastern Comma | 5 | 1990 |
| Viceroy | 5 | 1990 |
| Red-Spotted Purple | 5 | 1990 |
| Eyed Brown | 4 | 1990 |
| Silver Spotted Skipper | 4 | 1990 |
| Peck's Skipper | 4 | 1990 |
| Common Wood Nymph | 3 | 1990 |
| Least Skipper | 3 | 1990 |
| Tawny Edge | 3 | 1990 |
| Silvery Checkerspot | 3 | 1990 |
| Black Dash | 3 | 1990 |
| Baltimore Checkerspot | 3 | 1990 |
| Meadow Fritillary | 2 | 1990 |
| American Painted Lady | 2 | 1990 |
| Acadian Hairstreak | 2 | 1990 |
| Hobomok Skipper | 2 | 1990 |
| Mulberrywing | 2 | 1990 |
| Appalachian Brown | 2 | 1990 |
| Banded Hairstreak | 2 | 1990 |
| Delaware Skipper | 2 | 1990 |
| Broadwinged Skipper | 2 | 1990 |
| Aphrodite | 1 | 1990 |
| Regal Fritillary | 1 | 1990 |
| American Copper | 1 | 1990 |
| Long Dash | 1 | 1990 |
| Northern Cloudywing | 1 | 1990 |
| Coral Hairstreak | 1 | 1990 |
| Buckeye | 1 | 1990 |
| Little Yellow | 1 | 1990 |
| Little Glassywing | 1 | 1990 |
| Hackberry Butterfly | 1 | 1990 |
| Common Sootywing | 1 | 1990 |
| Northern Pearly-eye | 1 | 1990 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.