| Species | Sites Reporting | Year |
|---|---|---|
| Cabbage White | 121 | 2008 |
| Monarch | 119 | 2008 |
| Pearl Crescent | 105 | 2008 |
| Common/Orange Sulphur | 100 | 2008 |
| Black Swallowtail | 97 | 2008 |
| Spring/Summer Azure | 97 | 2008 |
| Eastern Tiger Swallowtail | 95 | 2008 |
| Eastern Tailed Blue | 92 | 2008 |
| Mourning Cloak | 79 | 2008 |
| Great Spangled Fritillary | 77 | 2008 |
| Common Wood Nymph | 70 | 2008 |
| Red Admiral | 64 | 2008 |
| Little Wood Satyr | 61 | 2008 |
| Viceroy | 56 | 2008 |
| Least Skipper | 54 | 2008 |
| Silver Spotted Skipper | 54 | 2008 |
| Red-Spotted Purple | 52 | 2008 |
| American Painted Lady | 48 | 2008 |
| Peck's Skipper | 47 | 2008 |
| Buckeye | 43 | 2008 |
| Eyed Brown | 37 | 2008 |
| Question Mark | 36 | 2008 |
| Eastern Comma | 34 | 2008 |
| European Skipper | 32 | 2008 |
| Northern Pearly-eye | 32 | 2008 |
| Tawny Edge | 26 | 2008 |
| Banded Hairstreak | 24 | 2008 |
| Giant Swallowtail | 23 | 2008 |
| Wild Indigo Duskywing | 22 | 2008 |
| Coral Hairstreak | 19 | 2008 |
| Silvery Checkerspot | 16 | 2008 |
| Cloudless Sulphur | 16 | 2008 |
| Hobomok Skipper | 16 | 2008 |
| Black Dash | 14 | 2008 |
| Bronze Copper | 14 | 2008 |
| Delaware Skipper | 14 | 2008 |
| Dion Skipper | 13 | 2008 |
| Hackberry Butterfly | 11 | 2008 |
| Broken Dash | 11 | 2008 |
| Meadow Fritillary | 10 | 2008 |
| Dun Skipper | 9 | 2008 |
| Acadian Hairstreak | 8 | 2008 |
| Baltimore Checkerspot | 7 | 2008 |
| Spicebush Swallowtail | 7 | 2008 |
| Common Sootywing | 7 | 2008 |
| Northern Cloudywing | 7 | 2008 |
| Crossline Skipper | 7 | 2008 |
| Appalachian Brown | 6 | 2008 |
| Broadwinged Skipper | 6 | 2008 |
| Silver-Bordered Fritillary | 6 | 2008 |
| Juvenal's Duskywing | 5 | 2008 |
| Pipevine Swallowtail | 5 | 2008 |
| Fiery Skipper | 5 | 2008 |
| Gray Hairstreak | 5 | 2008 |
| Striped Hairstreak | 5 | 2008 |
| Little Yellow | 5 | 2008 |
| Regal Fritillary | 4 | 2008 |
| Mulberrywing | 4 | 2008 |
| Edwards Hairstreak | 4 | 2008 |
| Purplish Copper | 4 | 2008 |
| American Copper | 3 | 2008 |
| Tawny Emperor | 3 | 2008 |
| Horace's Duskywing | 3 | 2008 |
| Little Glassywing | 3 | 2008 |
| Aphrodite | 2 | 2008 |
| Checkered White | 2 | 2008 |
| Long Dash | 2 | 2008 |
| Dusted Skipper | 2 | 2008 |
| Snout Butterfly | 2 | 2008 |
| Harvester | 2 | 2008 |
| Ottoe Skipper | 2 | 2008 |
| Dogface | 2 | 2008 |
| Milbert's Tortoiseshell | 2 | 2008 |
| Zabulon Skipper | 2 | 2008 |
| Olympia Marble | 1 | 2008 |
| Checkered Skipper | 1 | 2008 |
| Two Spot Skipper | 1 | 2008 |
| Roadside Skipper | 1 | 2008 |
| Variegated Fritillary | 1 | 2008 |
| Zebra Swallowtail | 1 | 2008 |
| Southern Cloudywing | 1 | 2008 |
| White-M Hairstreak | 1 | 2008 |
| Gray Comma | 1 | 2008 |
| Hoary Edge | 1 | 2008 |
| Goatweed Butterfly | 1 | 2008 |
| Mottled Duskywing | 1 | 2008 |
| Great Gray Copper | 1 | 2008 |
| Marine Blue | 1 | 2008 |
| Dwarf Sulphur | 1 | 2008 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.