| Species | Number of Sites |
|---|---|
| Acadian Hairstreak | 1 |
| American Copper | 1 |
| American Painted Lady | 27 |
| Appalachian Brown | 17 |
| Baltimore Checkerspot | 4 |
| Banded Hairstreak | 18 |
| Black Dash | 5 |
| Black Swallowtail | 92 |
| Broadwinged Skipper | 3 |
| Broken Dash | 2 |
| Bronze Copper | 4 |
| Buckeye | 52 |
| Byssus Skipper | 1 |
| Cabbage White | 93 |
| Checkered Skipper | 2 |
| Checkered White | 1 |
| Clouded Skipper | 1 |
| Cloudless Sulphur | 23 |
| Common Sootywing | 2 |
| Common Wood Nymph | 23 |
| Common/Orange Sulphur | 69 |
| Coral Hairstreak | 4 |
| Crossline Skipper | 3 |
| Delaware Skipper | 5 |
| Dion Skipper | 6 |
| Dogface | 1 |
| Dukes' Skipper | 1 |
| Dun Skipper | 15 |
| Dusted Skipper | 3 |
| Dwarf Sulphur | 1 |
| Eastern Comma | 28 |
| Eastern Tailed Blue | 67 |
| Eastern Tiger Swallowtail | 92 |
| Edwards Hairstreak | 1 |
| European Skipper | 5 |
| Eyed Brown | 20 |
| Falcate Orangetip | 2 |
| Fiery Skipper | 22 |
| Funereal Duskywing | 1 |
| Gemmed Satyr | 1 |
| Giant Swallowtail | 16 |
| Goatweed Butterfly | 1 |
| Gray Comma | 2 |
| Gray Hairstreak | 5 |
| Great Spangled Fritillary | 40 |
| Hackberry Butterfly | 25 |
| Hobomok Skipper | 11 |
| Horace's Duskywing | 1 |
| Juvenal's Duskywing | 1 |
| Least Skipper | 46 |
| Little Glassywing | 10 |
| Little Wood Satyr | 38 |
| Little Yellow | 15 |
| Meadow Fritillary | 2 |
| Monarch | 135 |
| Mourning Cloak | 28 |
| Northern Cloudywing | 3 |
| Northern Pearly-eye | 37 |
| Pearl Crescent | 95 |
| Peck's Skipper | 26 |
| Pepper and Salt Skipper | 1 |
| Pine Elfin | 1 |
| Pipevine Swallowtail | 14 |
| Question Mark | 30 |
| Reakirt's Blue | 1 |
| Red Admiral | 68 |
| Red-Spotted Purple | 69 |
| Roadside Skipper | 2 |
| Sachem | 2 |
| Silver Spotted Skipper | 72 |
| Silvery Checkerspot | 21 |
| Sleepy Orange | 1 |
| Snout Butterfly | 10 |
| Spicebush Swallowtail | 17 |
| Spring/Summer Azure | 78 |
| Tawny Edge | 12 |
| Tawny Emperor | 3 |
| Variegated Fritillary | 1 |
| Viceroy | 53 |
| Wild Indigo Duskywing | 17 |
| Zabulon Skipper | 10 |
| Zebra Swallowtail | 13 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.