| Species | Sites Reporting | Year |
|---|---|---|
| Monarch | 108 | 2010 |
| Cabbage White | 104 | 2010 |
| Spring/Summer Azure | 103 | 2010 |
| Common/Orange Sulphur | 102 | 2010 |
| Red Admiral | 99 | 2010 |
| Eastern Tiger Swallowtail | 94 | 2010 |
| Pearl Crescent | 93 | 2010 |
| Black Swallowtail | 82 | 2010 |
| Buckeye | 73 | 2010 |
| Great Spangled Fritillary | 67 | 2010 |
| Eastern Tailed Blue | 66 | 2010 |
| Question Mark | 60 | 2010 |
| Least Skipper | 57 | 2010 |
| Viceroy | 55 | 2010 |
| Red-Spotted Purple | 53 | 2010 |
| Common Wood Nymph | 53 | 2010 |
| American Painted Lady | 53 | 2010 |
| Mourning Cloak | 49 | 2010 |
| Silver Spotted Skipper | 44 | 2010 |
| Peck's Skipper | 40 | 2010 |
| Little Wood Satyr | 37 | 2010 |
| Northern Pearly-eye | 28 | 2010 |
| Eastern Comma | 28 | 2010 |
| Eyed Brown | 26 | 2010 |
| Fiery Skipper | 25 | 2010 |
| European Skipper | 24 | 2010 |
| Wild Indigo Duskywing | 22 | 2010 |
| Little Yellow | 22 | 2010 |
| Tawny Edge | 21 | 2010 |
| Silvery Checkerspot | 18 | 2010 |
| Delaware Skipper | 15 | 2010 |
| Bronze Copper | 14 | 2010 |
| Hackberry Butterfly | 14 | 2010 |
| Black Dash | 12 | 2010 |
| Dun Skipper | 12 | 2010 |
| Cloudless Sulphur | 11 | 2010 |
| Coral Hairstreak | 11 | 2010 |
| Pipevine Swallowtail | 9 | 2010 |
| Giant Swallowtail | 9 | 2010 |
| Broken Dash | 9 | 2010 |
| American Copper | 8 | 2010 |
| Dion Skipper | 8 | 2010 |
| Banded Hairstreak | 8 | 2010 |
| Meadow Fritillary | 8 | 2010 |
| Snout Butterfly | 8 | 2010 |
| Broadwinged Skipper | 7 | 2010 |
| Appalachian Brown | 6 | 2010 |
| Baltimore Checkerspot | 6 | 2010 |
| Checkered White | 6 | 2010 |
| Spicebush Swallowtail | 6 | 2010 |
| Variegated Fritillary | 6 | 2010 |
| Northern Cloudywing | 6 | 2010 |
| Regal Fritillary | 5 | 2010 |
| Acadian Hairstreak | 5 | 2010 |
| Checkered Skipper | 4 | 2010 |
| Dwarf Sulphur | 4 | 2010 |
| Horace's Duskywing | 4 | 2010 |
| Common Sootywing | 4 | 2010 |
| Hobomok Skipper | 4 | 2010 |
| Gray Hairstreak | 4 | 2010 |
| Long Dash | 4 | 2010 |
| Aphrodite | 3 | 2010 |
| Juvenal's Duskywing | 3 | 2010 |
| Zabulon Skipper | 3 | 2010 |
| Little Glassywing | 3 | 2010 |
| Purplish Copper | 3 | 2010 |
| Dusted Skipper | 3 | 2010 |
| Crossline Skipper | 3 | 2010 |
| Funereal Duskywing | 3 | 2010 |
| Karner Blue | 2 | 2010 |
| Striped Hairstreak | 2 | 2010 |
| Southern Cloudywing | 2 | 2010 |
| Mulberrywing | 2 | 2010 |
| Tawny Emperor | 2 | 2010 |
| Two Spot Skipper | 2 | 2010 |
| Leonard's Skipper | 2 | 2010 |
| Ottoe Skipper | 1 | 2010 |
| Roadside Skipper | 1 | 2010 |
| Gray Comma | 1 | 2010 |
| Goatweed Butterfly | 1 | 2010 |
| Silver-Bordered Fritillary | 1 | 2010 |
| Zebra Swallowtail | 1 | 2010 |
| Harvester | 1 | 2010 |
| Northern Hairstreak | 1 | 2010 |
| Arogos Skipper | 1 | 2010 |
| Edwards Hairstreak | 1 | 2010 |
| Olive Hairstreak | 1 | 2010 |
| Sachem | 1 | 2010 |
| Milbert's Tortoiseshell | 1 | 2010 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.