| Species | Sites Reporting |
|---|---|
| Common/Orange Sulphur | 101 |
| Monarch | 97 |
| Cabbage White | 95 |
| Eastern Tailed Blue | 86 |
| Spring/Summer Azure | 82 |
| Pearl Crescent | 80 |
| Eastern Tiger Swallowtail | 75 |
| Black Swallowtail | 74 |
| Common Wood Nymph | 58 |
| Great Spangled Fritillary | 58 |
| Red-Spotted Purple | 55 |
| Little Wood Satyr | 54 |
| Silver Spotted Skipper | 53 |
| Mourning Cloak | 47 |
| European Skipper | 45 |
| Eyed Brown | 43 |
| Red Admiral | 43 |
| Viceroy | 42 |
| Buckeye | 40 |
| Least Skipper | 35 |
| Northern Pearly-eye | 32 |
| Question Mark | 30 |
| Peck's Skipper | 25 |
| Eastern Comma | 24 |
| Silvery Checkerspot | 18 |
| Tawny Edge | 17 |
| Hobomok Skipper | 14 |
| Delaware Skipper | 14 |
| Dun Skipper | 11 |
| Giant Swallowtail | 11 |
| Appalachian Brown | 10 |
| Pipevine Swallowtail | 10 |
| Black Dash | 10 |
| American Painted Lady | 10 |
| Spicebush Swallowtail | 9 |
| Little Glassywing | 9 |
| Coral Hairstreak | 8 |
| Aphrodite | 8 |
| Hackberry Butterfly | 8 |
| Snout Butterfly | 8 |
| Fiery Skipper | 8 |
| Wild Indigo Duskywing | 7 |
| Little Yellow | 7 |
| Long Dash | 7 |
| Mulberrywing | 6 |
| Meadow Fritillary | 6 |
| Common Sootywing | 6 |
| Broken Dash | 6 |
| Banded Hairstreak | 6 |
| Bronze Copper | 6 |
| Broadwinged Skipper | 6 |
| Zabulon Skipper | 5 |
| Baltimore Checkerspot | 4 |
| Dion Skipper | 4 |
| Acadian Hairstreak | 4 |
| Crossline Skipper | 4 |
| Dogface | 4 |
| Purplish Copper | 3 |
| Juvenal's Duskywing | 3 |
| Silver-Bordered Fritillary | 3 |
| Horace's Duskywing | 3 |
| Cloudless Sulphur | 3 |
| American Copper | 3 |
| Southern Cloudywing | 3 |
| Edwards Hairstreak | 3 |
| Regal Fritillary | 2 |
| Gray Hairstreak | 2 |
| Roadside Skipper | 2 |
| Tawny Emperor | 2 |
| Mottled Duskywing | 2 |
| Olympia Marble | 1 |
| Two Spot Skipper | 1 |
| Hoary Elfin | 1 |
| Zebra Swallowtail | 1 |
| Dusky Azure | 1 |
| Milbert's Tortoiseshell | 1 |
| Checkered Skipper | 1 |
| Sachem | 1 |
| Striped Hairstreak | 1 |
| Variegated Fritillary | 1 |
| Dwarf Sulphur | 1 |
| Harvester | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.