| Species | Sites Reporting |
|---|---|
| Monarch | 159 |
| Red Admiral | 117 |
| Pearl Crescent | 103 |
| Cabbage White | 100 |
| Spring/Summer Azure | 98 |
| Black Swallowtail | 96 |
| Silver Spotted Skipper | 91 |
| Eastern Tiger Swallowtail | 84 |
| Buckeye | 81 |
| Red-Spotted Purple | 72 |
| American Painted Lady | 69 |
| Common/Orange Sulphur | 68 |
| Eastern Tailed Blue | 68 |
| Question Mark | 63 |
| Viceroy | 53 |
| Least Skipper | 52 |
| Great Spangled Fritillary | 48 |
| Little Wood Satyr | 43 |
| Eastern Comma | 38 |
| Common Wood Nymph | 35 |
| Northern Pearly-eye | 33 |
| Hackberry Butterfly | 28 |
| Silvery Checkerspot | 27 |
| Snout Butterfly | 25 |
| Peck's Skipper | 25 |
| Cloudless Sulphur | 24 |
| Spicebush Swallowtail | 24 |
| Little Yellow | 24 |
| Fiery Skipper | 23 |
| Mourning Cloak | 21 |
| Zebra Swallowtail | 19 |
| Pipevine Swallowtail | 18 |
| Banded Hairstreak | 16 |
| Appalachian Brown | 15 |
| Zabulon Skipper | 15 |
| Wild Indigo Duskywing | 14 |
| Tawny Edge | 13 |
| Tawny Emperor | 12 |
| Delaware Skipper | 12 |
| Giant Swallowtail | 11 |
| Eyed Brown | 10 |
| Falcate Orangetip | 9 |
| Hobomok Skipper | 9 |
| Variegated Fritillary | 9 |
| Dun Skipper | 8 |
| Coral Hairstreak | 8 |
| Gray Hairstreak | 8 |
| Dwarf Sulphur | 7 |
| Black Dash | 6 |
| European Skipper | 6 |
| Gemmed Satyr | 6 |
| Common Sootywing | 6 |
| Gray Comma | 6 |
| Bronze Copper | 6 |
| Sleepy Orange | 5 |
| Dion Skipper | 5 |
| Goatweed Butterfly | 4 |
| Little Glassywing | 4 |
| Meadow Fritillary | 4 |
| Baltimore Checkerspot | 3 |
| Broken Dash | 3 |
| Silver-Bordered Fritillary | 3 |
| Byssus Skipper | 3 |
| Southern Cloudywing | 3 |
| Broadwinged Skipper | 2 |
| Dogface | 2 |
| Dusted Skipper | 2 |
| Sachem | 2 |
| Crossline Skipper | 2 |
| Horace's Duskywing | 2 |
| Clouded Skipper | 2 |
| Aphrodite | 2 |
| Checkered White | 1 |
| Olive Hairstreak | 1 |
| Hoary Elfin | 1 |
| Edwards Hairstreak | 1 |
| Ocola Skipper | 1 |
| Leonard's Skipper | 1 |
| Dukes' Skipper | 1 |
| Roadside Skipper | 1 |
| Acadian Hairstreak | 1 |
| Gulf Fritillary | 1 |
| Checkered Skipper | 1 |
| Southern Pearly-eye | 1 |
| Northern Hairstreak | 1 |
| Harvester | 1 |
| Olympia Marble | 1 |
| Zarucco Duskywing | 1 |
| Mulberrywing | 1 |
| Northern Cloudywing | 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.