| Species | Sites Reporting |
|---|---|
| Cabbage White | 30 |
| Common/Orange Sulphur | 30 |
| Pearl Crescent | 28 |
| Spring/Summer Azure | 28 |
| Monarch | 28 |
| Great Spangled Fritillary | 25 |
| Eastern Tiger Swallowtail | 25 |
| Black Swallowtail | 24 |
| Silver Spotted Skipper | 23 |
| Eastern Tailed Blue | 22 |
| Common Wood Nymph | 22 |
| Mourning Cloak | 21 |
| Viceroy | 18 |
| Red-Spotted Purple | 18 |
| Little Wood Satyr | 17 |
| Least Skipper | 16 |
| Red Admiral | 16 |
| Question Mark | 15 |
| Buckeye | 15 |
| Peck's Skipper | 15 |
| European Skipper | 14 |
| Eastern Comma | 14 |
| Eyed Brown | 13 |
| Northern Pearly-eye | 13 |
| Hobomok Skipper | 12 |
| Delaware Skipper | 12 |
| Silvery Checkerspot | 11 |
| Banded Hairstreak | 9 |
| Bronze Copper | 9 |
| Aphrodite | 8 |
| Dion Skipper | 8 |
| Tawny Edge | 8 |
| Coral Hairstreak | 8 |
| Fiery Skipper | 8 |
| Dun Skipper | 8 |
| American Painted Lady | 7 |
| Snout Butterfly | 7 |
| Wild Indigo Duskywing | 7 |
| Appalachian Brown | 6 |
| Black Dash | 6 |
| Crossline Skipper | 6 |
| Horace's Duskywing | 6 |
| Pipevine Swallowtail | 5 |
| Baltimore Checkerspot | 4 |
| Broken Dash | 4 |
| Hackberry Butterfly | 4 |
| Little Yellow | 3 |
| Acadian Hairstreak | 3 |
| Broadwinged Skipper | 3 |
| Long Dash | 3 |
| Dogface | 3 |
| Mulberrywing | 3 |
| Common Sootywing | 3 |
| Gray Comma | 3 |
| Purplish Copper | 2 |
| Spicebush Swallowtail | 2 |
| Olympia Marble | 2 |
| Two Spot Skipper | 2 |
| Striped Hairstreak | 2 |
| Little Glassywing | 2 |
| Southern Cloudywing | 2 |
| Giant Swallowtail | 2 |
| Gray Hairstreak | 2 |
| Checkered Skipper | 2 |
| Milbert's Tortoiseshell | 2 |
| Regal Fritillary | 2 |
| Cloudless Sulphur | 1 |
| Sleepy Duskywing | 1 |
| American Copper | 1 |
| Sachem | 1 |
| Juvenal's Duskywing | 1 |
| Zabulon Skipper | 1 |
| Leonard's Skipper | 1 |
| Meadow Fritillary | 1 |
| Edwards Hairstreak | 1 |
| Harvester | 1 |
| Dusky Azure | 1 |
| Northern Cloudywing | 1 |
| Silver-Bordered Fritillary | 1 |
| Variegated Fritillary | 1 |
| Hickory Hairstreak | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.