| Species | Sites Reporting |
|---|---|
| Monarch | 149 |
| Cabbage White | 112 |
| Spring/Summer Azure | 98 |
| Pearl Crescent | 98 |
| Black Swallowtail | 92 |
| Common/Orange Sulphur | 88 |
| Eastern Tiger Swallowtail | 81 |
| Red Admiral | 75 |
| Silver Spotted Skipper | 71 |
| Red-Spotted Purple | 68 |
| Viceroy | 60 |
| Eastern Tailed Blue | 55 |
| Question Mark | 50 |
| Little Wood Satyr | 42 |
| Great Spangled Fritillary | 39 |
| Buckeye | 39 |
| Eastern Comma | 35 |
| Least Skipper | 33 |
| Northern Pearly-eye | 31 |
| Common Wood Nymph | 29 |
| American Painted Lady | 29 |
| Spicebush Swallowtail | 21 |
| Silvery Checkerspot | 21 |
| Peck's Skipper | 21 |
| Wild Indigo Duskywing | 20 |
| Mourning Cloak | 20 |
| Cloudless Sulphur | 19 |
| Giant Swallowtail | 19 |
| Banded Hairstreak | 17 |
| Little Yellow | 16 |
| Hackberry Butterfly | 16 |
| Tawny Edge | 14 |
| Eyed Brown | 13 |
| Pipevine Swallowtail | 10 |
| Zebra Swallowtail | 10 |
| Hobomok Skipper | 9 |
| Appalachian Brown | 9 |
| Variegated Fritillary | 9 |
| Delaware Skipper | 9 |
| Snout Butterfly | 8 |
| Common Sootywing | 7 |
| European Skipper | 7 |
| Dun Skipper | 7 |
| Coral Hairstreak | 7 |
| Zabulon Skipper | 7 |
| Gray Hairstreak | 6 |
| Fiery Skipper | 6 |
| Little Glassywing | 6 |
| Baltimore Checkerspot | 4 |
| Dion Skipper | 4 |
| Broken Dash | 4 |
| Tawny Emperor | 4 |
| Bronze Copper | 4 |
| Black Dash | 3 |
| Broadwinged Skipper | 3 |
| Acadian Hairstreak | 3 |
| Checkered Skipper | 3 |
| Dusted Skipper | 3 |
| Dwarf Sulphur | 3 |
| Gray Comma | 3 |
| Sleepy Orange | 2 |
| Meadow Fritillary | 2 |
| Northern Cloudywing | 2 |
| Harvester | 2 |
| Clouded Skipper | 2 |
| Silver-Bordered Fritillary | 2 |
| Long Dash | 2 |
| Horace's Duskywing | 2 |
| Crossline Skipper | 2 |
| Goatweed Butterfly | 2 |
| Southern Cloudywing | 2 |
| Sachem | 2 |
| Hoary Elfin | 1 |
| Olympia Marble | 1 |
| Gemmed Satyr | 1 |
| Dogface | 1 |
| Leonard's Skipper | 1 |
| Regal Fritillary | 1 |
| Striped Hairstreak | 1 |
| Dusky Azure | 1 |
| Gulf Fritillary | 1 |
| Roadside Skipper | 1 |
| Mulberrywing | 1 |
| Edwards Hairstreak | 1 |
| American Copper | 1 |
| Pepper and Salt Skipper | 1 |
| Northern Hairstreak | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.