| Species | Sites Reporting |
|---|---|
| Monarch | 65 |
| Cabbage White | 64 |
| Common/Orange Sulphur | 62 |
| Pearl Crescent | 58 |
| Spring/Summer Azure | 49 |
| Great Spangled Fritillary | 49 |
| Black Swallowtail | 48 |
| Eastern Tailed Blue | 44 |
| Buckeye | 41 |
| Eastern Tiger Swallowtail | 41 |
| Red Admiral | 39 |
| Common Wood Nymph | 37 |
| Viceroy | 35 |
| Mourning Cloak | 35 |
| Silver Spotted Skipper | 32 |
| Little Wood Satyr | 27 |
| European Skipper | 25 |
| Question Mark | 23 |
| Red-Spotted Purple | 23 |
| Least Skipper | 22 |
| Peck's Skipper | 22 |
| Eyed Brown | 21 |
| Eastern Comma | 16 |
| Bronze Copper | 15 |
| Northern Pearly-eye | 13 |
| Tawny Edge | 12 |
| Delaware Skipper | 12 |
| American Painted Lady | 12 |
| Dun Skipper | 11 |
| Fiery Skipper | 11 |
| Hobomok Skipper | 9 |
| Black Dash | 9 |
| Silvery Checkerspot | 9 |
| Appalachian Brown | 9 |
| Banded Hairstreak | 9 |
| Giant Swallowtail | 9 |
| Wild Indigo Duskywing | 8 |
| Common Sootywing | 8 |
| Pipevine Swallowtail | 7 |
| Aphrodite | 7 |
| Coral Hairstreak | 7 |
| Dion Skipper | 6 |
| Hackberry Butterfly | 6 |
| Acadian Hairstreak | 6 |
| Variegated Fritillary | 6 |
| Gray Comma | 6 |
| Horace's Duskywing | 6 |
| Little Yellow | 5 |
| Broken Dash | 5 |
| Snout Butterfly | 5 |
| Broadwinged Skipper | 5 |
| Long Dash | 5 |
| Spicebush Swallowtail | 4 |
| Mulberrywing | 4 |
| Meadow Fritillary | 4 |
| Gray Hairstreak | 4 |
| Little Glassywing | 4 |
| Baltimore Checkerspot | 3 |
| Purplish Copper | 3 |
| American Copper | 3 |
| Cloudless Sulphur | 3 |
| Crossline Skipper | 3 |
| Dogface | 3 |
| Juvenal's Duskywing | 2 |
| Regal Fritillary | 2 |
| Zabulon Skipper | 2 |
| Northern Cloudywing | 2 |
| Silver-Bordered Fritillary | 2 |
| Olympia Marble | 1 |
| Dwarf Sulphur | 1 |
| Sleepy Duskywing | 1 |
| Two Spot Skipper | 1 |
| Edwards Hairstreak | 1 |
| Dusky Azure | 1 |
| Goatweed Butterfly | 1 |
| Great Gray Copper | 1 |
| Sachem | 1 |
| Checkered White | 1 |
| Checkered Skipper | 1 |
| Hayhurst's Scallopwing | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.