| Species | Sites Reporting | Year |
|---|---|---|
| Cabbage White | 121 | 2007 |
| Red Admiral | 114 | 2007 |
| Common/Orange Sulphur | 113 | 2007 |
| Eastern Tiger Swallowtail | 111 | 2007 |
| Pearl Crescent | 107 | 2007 |
| Eastern Tailed Blue | 102 | 2007 |
| Black Swallowtail | 102 | 2007 |
| Spring/Summer Azure | 97 | 2007 |
| Little Wood Satyr | 84 | 2007 |
| Great Spangled Fritillary | 84 | 2007 |
| Red-Spotted Purple | 79 | 2007 |
| Common Wood Nymph | 77 | 2007 |
| Question Mark | 77 | 2007 |
| Mourning Cloak | 72 | 2007 |
| Viceroy | 71 | 2007 |
| Least Skipper | 61 | 2007 |
| Silver Spotted Skipper | 61 | 2007 |
| Buckeye | 54 | 2007 |
| Peck's Skipper | 51 | 2007 |
| American Painted Lady | 48 | 2007 |
| Tawny Edge | 40 | 2007 |
| Northern Pearly-eye | 39 | 2007 |
| Eyed Brown | 32 | 2007 |
| European Skipper | 32 | 2007 |
| Giant Swallowtail | 31 | 2007 |
| Eastern Comma | 29 | 2007 |
| Fiery Skipper | 28 | 2007 |
| Banded Hairstreak | 27 | 2007 |
| Wild Indigo Duskywing | 24 | 2007 |
| Delaware Skipper | 21 | 2007 |
| Little Yellow | 18 | 2007 |
| Snout Butterfly | 18 | 2007 |
| Black Dash | 17 | 2007 |
| Cloudless Sulphur | 16 | 2007 |
| Dion Skipper | 15 | 2007 |
| Coral Hairstreak | 15 | 2007 |
| Hackberry Butterfly | 15 | 2007 |
| Common Sootywing | 15 | 2007 |
| Dun Skipper | 15 | 2007 |
| Broken Dash | 14 | 2007 |
| Pipevine Swallowtail | 13 | 2007 |
| Silvery Checkerspot | 13 | 2007 |
| Spicebush Swallowtail | 13 | 2007 |
| Hobomok Skipper | 12 | 2007 |
| Baltimore Checkerspot | 11 | 2007 |
| Bronze Copper | 11 | 2007 |
| Acadian Hairstreak | 10 | 2007 |
| Crossline Skipper | 10 | 2007 |
| Little Glassywing | 10 | 2007 |
| Meadow Fritillary | 9 | 2007 |
| Long Dash | 8 | 2007 |
| Juvenal's Duskywing | 7 | 2007 |
| Regal Fritillary | 6 | 2007 |
| Appalachian Brown | 6 | 2007 |
| Mulberrywing | 6 | 2007 |
| Tawny Emperor | 6 | 2007 |
| Northern Cloudywing | 5 | 2007 |
| Gray Hairstreak | 5 | 2007 |
| American Copper | 5 | 2007 |
| Dwarf Sulphur | 4 | 2007 |
| Aphrodite | 4 | 2007 |
| Broadwinged Skipper | 4 | 2007 |
| Silver-Bordered Fritillary | 4 | 2007 |
| Striped Hairstreak | 4 | 2007 |
| Southern Cloudywing | 3 | 2007 |
| Dogface | 3 | 2007 |
| Gray Comma | 3 | 2007 |
| Harvester | 3 | 2007 |
| Checkered Skipper | 2 | 2007 |
| Dusted Skipper | 2 | 2007 |
| Roadside Skipper | 2 | 2007 |
| Purplish Copper | 2 | 2007 |
| Edwards Hairstreak | 2 | 2007 |
| Variegated Fritillary | 2 | 2007 |
| Horace's Duskywing | 2 | 2007 |
| Checkered White | 2 | 2007 |
| Two Spot Skipper | 1 | 2007 |
| Hoary Elfin | 1 | 2007 |
| Olympia Marble | 1 | 2007 |
| Sleepy Duskywing | 1 | 2007 |
| Zabulon Skipper | 1 | 2007 |
| Swarthy Skipper | 1 | 2007 |
| Henry's Elfin | 1 | 2007 |
| Goatweed Butterfly | 1 | 2007 |
| Ottoe Skipper | 1 | 2007 |
| Byssus Skipper | 1 | 2007 |
| Hoary Edge | 1 | 2007 |
| Indian Skipper | 1 | 2007 |
| Marine Blue | 1 | 2007 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.