| Species | Sites Reporting |
|---|---|
| Monarch | 118 |
| Cabbage White | 99 |
| Pearl Crescent | 82 |
| Red Admiral | 81 |
| Eastern Tiger Swallowtail | 79 |
| Common/Orange Sulphur | 75 |
| Spring/Summer Azure | 75 |
| Black Swallowtail | 75 |
| Silver Spotted Skipper | 65 |
| Buckeye | 56 |
| Eastern Tailed Blue | 55 |
| Viceroy | 54 |
| Great Spangled Fritillary | 50 |
| Red-Spotted Purple | 45 |
| American Painted Lady | 44 |
| Question Mark | 42 |
| Little Wood Satyr | 40 |
| Least Skipper | 38 |
| Common Wood Nymph | 36 |
| Northern Pearly-eye | 32 |
| Wild Indigo Duskywing | 23 |
| Eastern Comma | 23 |
| Eyed Brown | 18 |
| Tawny Edge | 18 |
| Silvery Checkerspot | 17 |
| Giant Swallowtail | 16 |
| Peck's Skipper | 15 |
| Hobomok Skipper | 13 |
| Mourning Cloak | 13 |
| Spicebush Swallowtail | 12 |
| Hackberry Butterfly | 12 |
| European Skipper | 12 |
| Little Yellow | 9 |
| Zabulon Skipper | 9 |
| Delaware Skipper | 9 |
| Appalachian Brown | 8 |
| Snout Butterfly | 8 |
| Banded Hairstreak | 7 |
| Cloudless Sulphur | 7 |
| Fiery Skipper | 7 |
| Dun Skipper | 7 |
| Black Dash | 6 |
| Pipevine Swallowtail | 6 |
| Little Glassywing | 5 |
| Broken Dash | 5 |
| Common Sootywing | 5 |
| Baltimore Checkerspot | 4 |
| Dion Skipper | 4 |
| Coral Hairstreak | 4 |
| Meadow Fritillary | 4 |
| Gray Comma | 4 |
| Dogface | 4 |
| Gray Hairstreak | 3 |
| Variegated Fritillary | 3 |
| Harvester | 3 |
| Horace's Duskywing | 3 |
| Tawny Emperor | 3 |
| Crossline Skipper | 3 |
| Olympia Marble | 2 |
| Dusted Skipper | 2 |
| Mulberrywing | 2 |
| Silver-Bordered Fritillary | 2 |
| Broadwinged Skipper | 2 |
| Bronze Copper | 2 |
| Juvenal's Duskywing | 2 |
| Hoary Elfin | 1 |
| Zebra Swallowtail | 1 |
| Northern Cloudywing | 1 |
| Clouded Skipper | 1 |
| Roadside Skipper | 1 |
| Great Gray Copper | 1 |
| Ottoe Skipper | 1 |
| Striped Hairstreak | 1 |
| Goatweed Butterfly | 1 |
| Funereal Duskywing | 1 |
| Dwarf Sulphur | 1 |
| Aphrodite | 1 |
| Edwards Hairstreak | 1 |
| Long Dash | 1 |
| Purplish Copper | 1 |
| Sleepy Orange | 1 |
| Checkered Skipper | 1 |
| Checkered White | 1 |
| American Copper | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.