| Species | Sites Reporting | Year |
|---|---|---|
| Cabbage White | 95 | 2015 |
| Monarch | 93 | 2015 |
| Red Admiral | 86 | 2015 |
| Spring/Summer Azure | 85 | 2015 |
| Pearl Crescent | 82 | 2015 |
| Great Spangled Fritillary | 67 | 2015 |
| Common/Orange Sulphur | 66 | 2015 |
| Mourning Cloak | 57 | 2015 |
| Eastern Tiger Swallowtail | 57 | 2015 |
| Viceroy | 56 | 2015 |
| Question Mark | 55 | 2015 |
| Black Swallowtail | 53 | 2015 |
| Red-Spotted Purple | 48 | 2015 |
| Eastern Tailed Blue | 47 | 2015 |
| Silver Spotted Skipper | 46 | 2015 |
| Little Wood Satyr | 45 | 2015 |
| Eastern Comma | 44 | 2015 |
| Least Skipper | 43 | 2015 |
| Common Wood Nymph | 40 | 2015 |
| Peck's Skipper | 25 | 2015 |
| Northern Pearly-eye | 24 | 2015 |
| American Painted Lady | 22 | 2015 |
| Wild Indigo Duskywing | 20 | 2015 |
| Eyed Brown | 17 | 2015 |
| Tawny Edge | 16 | 2015 |
| Delaware Skipper | 14 | 2015 |
| Buckeye | 14 | 2015 |
| Hackberry Butterfly | 14 | 2015 |
| Banded Hairstreak | 13 | 2015 |
| Silvery Checkerspot | 13 | 2015 |
| European Skipper | 11 | 2015 |
| Spicebush Swallowtail | 10 | 2015 |
| Giant Swallowtail | 10 | 2015 |
| Hobomok Skipper | 9 | 2015 |
| Coral Hairstreak | 9 | 2015 |
| Meadow Fritillary | 9 | 2015 |
| Cloudless Sulphur | 9 | 2015 |
| Appalachian Brown | 8 | 2015 |
| American Copper | 8 | 2015 |
| Snout Butterfly | 8 | 2015 |
| Common Sootywing | 7 | 2015 |
| Little Yellow | 6 | 2015 |
| Dun Skipper | 6 | 2015 |
| Little Glassywing | 6 | 2015 |
| Bronze Copper | 5 | 2015 |
| Northern Cloudywing | 5 | 2015 |
| Dion Skipper | 5 | 2015 |
| Crossline Skipper | 5 | 2015 |
| Broken Dash | 5 | 2015 |
| Striped Hairstreak | 5 | 2015 |
| Edwards Hairstreak | 4 | 2015 |
| Gray Comma | 4 | 2015 |
| Black Dash | 4 | 2015 |
| Silver-Bordered Fritillary | 4 | 2015 |
| Tawny Emperor | 4 | 2015 |
| Broadwinged Skipper | 4 | 2015 |
| Zebra Swallowtail | 4 | 2015 |
| Fiery Skipper | 4 | 2015 |
| Gray Hairstreak | 3 | 2015 |
| Baltimore Checkerspot | 2 | 2015 |
| Olympia Marble | 2 | 2015 |
| Dusted Skipper | 2 | 2015 |
| Juvenal's Duskywing | 2 | 2015 |
| Clouded Skipper | 2 | 2015 |
| Acadian Hairstreak | 2 | 2015 |
| Pipevine Swallowtail | 2 | 2015 |
| Persius Duskywing | 2 | 2015 |
| Variegated Fritillary | 2 | 2015 |
| Dogface | 2 | 2015 |
| Long Dash | 2 | 2015 |
| Checkered White | 2 | 2015 |
| Hoary Elfin | 1 | 2015 |
| Roadside Skipper | 1 | 2015 |
| Twelve-spotted Skimmer | 1 | 2015 |
| Common Baskettail | 1 | 2015 |
| Common Whitetail | 1 | 2015 |
| Familiar Bluet | 1 | 2015 |
| Funereal Duskywing | 1 | 2015 |
| Great Gray Copper | 1 | 2015 |
| Mulberrywing | 1 | 2015 |
| Horace's Duskywing | 1 | 2015 |
| Dwarf Sulphur | 1 | 2015 |
| Indian Skipper | 1 | 2015 |
| Common Green Darner | 1 | 2015 |
| Eastern Forktail | 1 | 2015 |
| Pepper and Salt Skipper | 1 | 2015 |
| Hoary Edge | 1 | 2015 |
| Reakirt's Blue | 1 | 2015 |
| Gulf Fritillary | 1 | 2015 |
| Northern Hairstreak | 1 | 2015 |
| Regal Fritillary | 1 | 2015 |
| Purplish Copper | 1 | 2015 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.