| Species | Sites Reporting |
|---|---|
| Cabbage White | 139 |
| Monarch | 138 |
| Spring/Summer Azure | 128 |
| Common/Orange Sulphur | 125 |
| Eastern Tiger Swallowtail | 124 |
| Pearl Crescent | 114 |
| Eastern Tailed Blue | 98 |
| Great Spangled Fritillary | 95 |
| Black Swallowtail | 86 |
| Common Wood Nymph | 85 |
| Little Wood Satyr | 77 |
| Red Admiral | 73 |
| Silver Spotted Skipper | 61 |
| Viceroy | 56 |
| American Painted Lady | 56 |
| Red-Spotted Purple | 54 |
| Least Skipper | 48 |
| Peck's Skipper | 48 |
| Eyed Brown | 46 |
| Question Mark | 39 |
| European Skipper | 35 |
| Mourning Cloak | 35 |
| Northern Pearly-eye | 24 |
| Tawny Edge | 21 |
| Eastern Comma | 20 |
| Hobomok Skipper | 19 |
| Delaware Skipper | 17 |
| Banded Hairstreak | 16 |
| Coral Hairstreak | 16 |
| Buckeye | 15 |
| Giant Swallowtail | 15 |
| Meadow Fritillary | 14 |
| Silvery Checkerspot | 14 |
| Bronze Copper | 14 |
| Black Dash | 13 |
| Dion Skipper | 12 |
| Wild Indigo Duskywing | 11 |
| Cloudless Sulphur | 11 |
| Dun Skipper | 11 |
| Hackberry Butterfly | 10 |
| Broken Dash | 10 |
| Fiery Skipper | 10 |
| Baltimore Checkerspot | 9 |
| Spicebush Swallowtail | 9 |
| Pipevine Swallowtail | 8 |
| Common Sootywing | 8 |
| Little Yellow | 7 |
| Appalachian Brown | 7 |
| Northern Cloudywing | 7 |
| Little Glassywing | 7 |
| Long Dash | 6 |
| Silver-Bordered Fritillary | 6 |
| Gray Hairstreak | 5 |
| Juvenal's Duskywing | 5 |
| Checkered White | 5 |
| Horace's Duskywing | 5 |
| Aphrodite | 4 |
| Broadwinged Skipper | 4 |
| Tawny Emperor | 4 |
| Crossline Skipper | 4 |
| American Copper | 4 |
| Dogface | 3 |
| Variegated Fritillary | 3 |
| Southern Cloudywing | 3 |
| Snout Butterfly | 3 |
| Dusted Skipper | 3 |
| Edwards Hairstreak | 3 |
| Roadside Skipper | 3 |
| Zebra Swallowtail | 2 |
| Mulberrywing | 2 |
| Henry's Elfin | 2 |
| Checkered Skipper | 2 |
| Zabulon Skipper | 2 |
| Sleepy Duskywing | 2 |
| Sachem | 2 |
| Acadian Hairstreak | 2 |
| Milbert's Tortoiseshell | 2 |
| Regal Fritillary | 2 |
| Gray Comma | 2 |
| Purplish Copper | 1 |
| Falcate Orangetip | 1 |
| Olympia Marble | 1 |
| Hoary Elfin | 1 |
| Hoary Edge | 1 |
| Gorgone Checkerspot | 1 |
| Ottoe Skipper | 1 |
| Goatweed Butterfly | 1 |
| Dwarf Sulphur | 1 |
| Leonard's Skipper | 1 |
| Striped Hairstreak | 1 |
| Two Spot Skipper | 1 |
| Hayhurst's Scallopwing | 1 |
| Mottled Duskywing | 1 |
| White-M Hairstreak | 1 |
| Harvester | 1 |
| Great Gray Copper | 1 |
| Dusky Azure | 1 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.