| Species | Sites Reporting | Year |
|---|---|---|
| Monarch | 124 | 2006 |
| Cabbage White | 119 | 2006 |
| Spring/Summer Azure | 106 | 2006 |
| Pearl Crescent | 105 | 2006 |
| Eastern Tiger Swallowtail | 103 | 2006 |
| Black Swallowtail | 99 | 2006 |
| Common/Orange Sulphur | 91 | 2006 |
| Great Spangled Fritillary | 87 | 2006 |
| Eastern Tailed Blue | 84 | 2006 |
| Little Wood Satyr | 74 | 2006 |
| Question Mark | 66 | 2006 |
| Common Wood Nymph | 64 | 2006 |
| Least Skipper | 52 | 2006 |
| Silver Spotted Skipper | 51 | 2006 |
| Red-Spotted Purple | 48 | 2006 |
| Viceroy | 47 | 2006 |
| Mourning Cloak | 47 | 2006 |
| Red Admiral | 41 | 2006 |
| Eastern Comma | 40 | 2006 |
| Peck's Skipper | 39 | 2006 |
| Eyed Brown | 33 | 2006 |
| Tawny Edge | 31 | 2006 |
| Buckeye | 29 | 2006 |
| Northern Pearly-eye | 28 | 2006 |
| European Skipper | 24 | 2006 |
| Wild Indigo Duskywing | 19 | 2006 |
| Silvery Checkerspot | 19 | 2006 |
| Giant Swallowtail | 18 | 2006 |
| Black Dash | 16 | 2006 |
| Banded Hairstreak | 15 | 2006 |
| Hobomok Skipper | 15 | 2006 |
| Coral Hairstreak | 15 | 2006 |
| Delaware Skipper | 15 | 2006 |
| Snout Butterfly | 15 | 2006 |
| Hackberry Butterfly | 13 | 2006 |
| Cloudless Sulphur | 13 | 2006 |
| Dion Skipper | 13 | 2006 |
| Pipevine Swallowtail | 11 | 2006 |
| American Painted Lady | 11 | 2006 |
| Common Sootywing | 10 | 2006 |
| Spicebush Swallowtail | 9 | 2006 |
| Broken Dash | 9 | 2006 |
| Baltimore Checkerspot | 8 | 2006 |
| Little Yellow | 8 | 2006 |
| Dun Skipper | 8 | 2006 |
| Meadow Fritillary | 8 | 2006 |
| Gray Hairstreak | 6 | 2006 |
| Long Dash | 6 | 2006 |
| Little Glassywing | 6 | 2006 |
| Gray Comma | 6 | 2006 |
| Northern Cloudywing | 5 | 2006 |
| Bronze Copper | 5 | 2006 |
| Acadian Hairstreak | 5 | 2006 |
| Fiery Skipper | 5 | 2006 |
| Checkered Skipper | 4 | 2006 |
| Regal Fritillary | 4 | 2006 |
| Appalachian Brown | 4 | 2006 |
| Aphrodite | 4 | 2006 |
| Horace's Duskywing | 4 | 2006 |
| Broadwinged Skipper | 3 | 2006 |
| Mulberrywing | 3 | 2006 |
| Crossline Skipper | 3 | 2006 |
| Checkered White | 2 | 2006 |
| Dwarf Sulphur | 2 | 2006 |
| Variegated Fritillary | 2 | 2006 |
| Juvenal's Duskywing | 2 | 2006 |
| Karner Blue | 2 | 2006 |
| Silver-Bordered Fritillary | 2 | 2006 |
| Southern Cloudywing | 2 | 2006 |
| Dusted Skipper | 2 | 2006 |
| Edwards Hairstreak | 2 | 2006 |
| Reversed Roadside Skipper | 2 | 2006 |
| Tawny Emperor | 2 | 2006 |
| Striped Hairstreak | 2 | 2006 |
| Dogface | 1 | 2006 |
| Sleepy Duskywing | 1 | 2006 |
| Swarthy Skipper | 1 | 2006 |
| Olympia Marble | 1 | 2006 |
| Swamp Metalmark | 1 | 2006 |
| Milbert's Tortoiseshell | 1 | 2006 |
| Hoary Edge | 1 | 2006 |
| Olive Hairstreak | 1 | 2006 |
| Harvester | 1 | 2006 |
| Ottoe Skipper | 1 | 2006 |
| Two Spot Skipper | 1 | 2006 |
| Zabulon Skipper | 1 | 2006 |
| American Copper | 1 | 2006 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.