| Species | Sites Reporting | Year |
|---|---|---|
| Common/Orange Sulphur | 79 | 2012 |
| Cabbage White | 77 | 2012 |
| Monarch | 75 | 2012 |
| Pearl Crescent | 67 | 2012 |
| Buckeye | 65 | 2012 |
| Spring/Summer Azure | 62 | 2012 |
| Red Admiral | 60 | 2012 |
| Eastern Tailed Blue | 55 | 2012 |
| Black Swallowtail | 54 | 2012 |
| Great Spangled Fritillary | 51 | 2012 |
| Eastern Tiger Swallowtail | 46 | 2012 |
| Least Skipper | 45 | 2012 |
| Fiery Skipper | 39 | 2012 |
| Common Wood Nymph | 37 | 2012 |
| Silver Spotted Skipper | 37 | 2012 |
| Question Mark | 34 | 2012 |
| Little Wood Satyr | 28 | 2012 |
| Viceroy | 27 | 2012 |
| Peck's Skipper | 26 | 2012 |
| Mourning Cloak | 26 | 2012 |
| American Painted Lady | 24 | 2012 |
| Little Yellow | 23 | 2012 |
| Red-Spotted Purple | 20 | 2012 |
| European Skipper | 19 | 2012 |
| Tawny Edge | 17 | 2012 |
| Eastern Comma | 15 | 2012 |
| Eyed Brown | 14 | 2012 |
| Wild Indigo Duskywing | 14 | 2012 |
| Northern Pearly-eye | 14 | 2012 |
| Delaware Skipper | 11 | 2012 |
| Gray Hairstreak | 11 | 2012 |
| Silvery Checkerspot | 10 | 2012 |
| Pipevine Swallowtail | 9 | 2012 |
| Sachem | 9 | 2012 |
| Coral Hairstreak | 9 | 2012 |
| Variegated Fritillary | 9 | 2012 |
| Hobomok Skipper | 9 | 2012 |
| Appalachian Brown | 8 | 2012 |
| Cloudless Sulphur | 8 | 2012 |
| Dwarf Sulphur | 7 | 2012 |
| Snout Butterfly | 7 | 2012 |
| Meadow Fritillary | 7 | 2012 |
| Black Dash | 6 | 2012 |
| Dion Skipper | 6 | 2012 |
| Broadwinged Skipper | 6 | 2012 |
| Common Sootywing | 6 | 2012 |
| Spicebush Swallowtail | 6 | 2012 |
| Bronze Copper | 6 | 2012 |
| Checkered Skipper | 5 | 2012 |
| Broken Dash | 5 | 2012 |
| Checkered White | 5 | 2012 |
| Crossline Skipper | 5 | 2012 |
| Dun Skipper | 4 | 2012 |
| Northern Cloudywing | 4 | 2012 |
| Giant Swallowtail | 4 | 2012 |
| Hackberry Butterfly | 4 | 2012 |
| Little Glassywing | 4 | 2012 |
| Regal Fritillary | 3 | 2012 |
| Baltimore Checkerspot | 3 | 2012 |
| American Copper | 3 | 2012 |
| Dusted Skipper | 3 | 2012 |
| Dogface | 2 | 2012 |
| Karner Blue | 2 | 2012 |
| Mulberrywing | 2 | 2012 |
| Zabulon Skipper | 2 | 2012 |
| Aphrodite | 2 | 2012 |
| Gray Comma | 2 | 2012 |
| Acadian Hairstreak | 1 | 2012 |
| Banded Hairstreak | 1 | 2012 |
| Ottoe Skipper | 1 | 2012 |
| White-M Hairstreak | 1 | 2012 |
| Edwards Hairstreak | 1 | 2012 |
| Gorgone Checkerspot | 1 | 2012 |
| Milbert's Tortoiseshell | 1 | 2012 |
| Sleepy Orange | 1 | 2012 |
| Purplish Copper | 1 | 2012 |
| Falcate Orangetip | 1 | 2012 |
| Long Dash | 1 | 2012 |
| Northern Hairstreak | 1 | 2012 |
| Horace's Duskywing | 1 | 2012 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.