| Species | Sites Reporting |
|---|---|
| Cabbage White | 86 |
| Monarch | 76 |
| Pearl Crescent | 72 |
| Spring/Summer Azure | 70 |
| Eastern Tiger Swallowtail | 69 |
| Common/Orange Sulphur | 67 |
| Black Swallowtail | 67 |
| Eastern Tailed Blue | 65 |
| Mourning Cloak | 61 |
| Great Spangled Fritillary | 43 |
| Red Admiral | 43 |
| Silver Spotted Skipper | 41 |
| Least Skipper | 39 |
| Viceroy | 38 |
| Little Wood Satyr | 37 |
| Buckeye | 37 |
| Common Wood Nymph | 33 |
| Red-Spotted Purple | 33 |
| Question Mark | 30 |
| Eastern Comma | 19 |
| Peck's Skipper | 18 |
| American Painted Lady | 15 |
| Northern Pearly-eye | 13 |
| European Skipper | 12 |
| Wild Indigo Duskywing | 12 |
| Eyed Brown | 12 |
| Tawny Edge | 12 |
| Spicebush Swallowtail | 11 |
| Delaware Skipper | 9 |
| Silvery Checkerspot | 8 |
| Banded Hairstreak | 8 |
| Little Yellow | 7 |
| Cloudless Sulphur | 7 |
| Fiery Skipper | 7 |
| Hackberry Butterfly | 7 |
| Appalachian Brown | 6 |
| Meadow Fritillary | 6 |
| Hobomok Skipper | 6 |
| Broken Dash | 6 |
| Dion Skipper | 5 |
| Black Dash | 5 |
| Coral Hairstreak | 4 |
| Dun Skipper | 4 |
| Northern Cloudywing | 4 |
| Bronze Copper | 4 |
| Common Sootywing | 4 |
| Crossline Skipper | 4 |
| Broadwinged Skipper | 3 |
| Striped Hairstreak | 3 |
| Giant Swallowtail | 3 |
| Checkered Skipper | 3 |
| Horace's Duskywing | 3 |
| Long Dash | 3 |
| Two Spot Skipper | 3 |
| Mulberrywing | 3 |
| Regal Fritillary | 2 |
| Baltimore Checkerspot | 2 |
| Dusted Skipper | 2 |
| Aphrodite | 2 |
| American Copper | 2 |
| Acadian Hairstreak | 2 |
| Checkered White | 2 |
| Juvenal's Duskywing | 2 |
| Little Glassywing | 2 |
| Snout Butterfly | 2 |
| Variegated Fritillary | 2 |
| Gray Hairstreak | 2 |
| Pipevine Swallowtail | 1 |
| Funereal Duskywing | 1 |
| Leonard's Skipper | 1 |
| Gray Comma | 1 |
| Dogface | 1 |
| Dwarf Sulphur | 1 |
| Tawny Emperor | 1 |
| Mottled Duskywing | 1 |
| Goatweed Butterfly | 1 |
| Dusky Azure | 1 |
| Zebra Swallowtail | 1 |
| Dreamy Duskywing | 1 |
| Northern Hairstreak | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.