| Species | Sites Reporting | Year |
|---|---|---|
| Monarch | 159 | 2019 |
| Red Admiral | 117 | 2019 |
| Pearl Crescent | 103 | 2019 |
| Cabbage White | 100 | 2019 |
| Spring/Summer Azure | 98 | 2019 |
| Black Swallowtail | 96 | 2019 |
| Silver Spotted Skipper | 91 | 2019 |
| Eastern Tiger Swallowtail | 84 | 2019 |
| Buckeye | 81 | 2019 |
| Red-Spotted Purple | 72 | 2019 |
| American Painted Lady | 69 | 2019 |
| Common/Orange Sulphur | 68 | 2019 |
| Eastern Tailed Blue | 68 | 2019 |
| Question Mark | 63 | 2019 |
| Viceroy | 53 | 2019 |
| Least Skipper | 52 | 2019 |
| Great Spangled Fritillary | 48 | 2019 |
| Little Wood Satyr | 43 | 2019 |
| Eastern Comma | 38 | 2019 |
| Common Wood Nymph | 35 | 2019 |
| Northern Pearly-eye | 33 | 2019 |
| Hackberry Butterfly | 28 | 2019 |
| Silvery Checkerspot | 27 | 2019 |
| Snout Butterfly | 25 | 2019 |
| Peck's Skipper | 25 | 2019 |
| Cloudless Sulphur | 24 | 2019 |
| Spicebush Swallowtail | 24 | 2019 |
| Little Yellow | 24 | 2019 |
| Fiery Skipper | 23 | 2019 |
| Mourning Cloak | 21 | 2019 |
| Zebra Swallowtail | 19 | 2019 |
| Pipevine Swallowtail | 18 | 2019 |
| Banded Hairstreak | 16 | 2019 |
| Appalachian Brown | 15 | 2019 |
| Zabulon Skipper | 15 | 2019 |
| Wild Indigo Duskywing | 14 | 2019 |
| Tawny Edge | 13 | 2019 |
| Tawny Emperor | 12 | 2019 |
| Delaware Skipper | 12 | 2019 |
| Giant Swallowtail | 11 | 2019 |
| Eyed Brown | 10 | 2019 |
| Falcate Orangetip | 9 | 2019 |
| Hobomok Skipper | 9 | 2019 |
| Variegated Fritillary | 9 | 2019 |
| Dun Skipper | 8 | 2019 |
| Coral Hairstreak | 8 | 2019 |
| Gray Hairstreak | 8 | 2019 |
| Dwarf Sulphur | 7 | 2019 |
| Black Dash | 6 | 2019 |
| European Skipper | 6 | 2019 |
| Gemmed Satyr | 6 | 2019 |
| Common Sootywing | 6 | 2019 |
| Gray Comma | 6 | 2019 |
| Bronze Copper | 6 | 2019 |
| Sleepy Orange | 5 | 2019 |
| Dion Skipper | 5 | 2019 |
| Goatweed Butterfly | 4 | 2019 |
| Little Glassywing | 4 | 2019 |
| Meadow Fritillary | 4 | 2019 |
| Baltimore Checkerspot | 3 | 2019 |
| Broken Dash | 3 | 2019 |
| Silver-Bordered Fritillary | 3 | 2019 |
| Byssus Skipper | 3 | 2019 |
| Southern Cloudywing | 3 | 2019 |
| Broadwinged Skipper | 2 | 2019 |
| Dogface | 2 | 2019 |
| Dusted Skipper | 2 | 2019 |
| Sachem | 2 | 2019 |
| Crossline Skipper | 2 | 2019 |
| Horace's Duskywing | 2 | 2019 |
| Clouded Skipper | 2 | 2019 |
| Aphrodite | 2 | 2019 |
| Checkered White | 1 | 2019 |
| Olive Hairstreak | 1 | 2019 |
| Hoary Elfin | 1 | 2019 |
| Edwards Hairstreak | 1 | 2019 |
| Ocola Skipper | 1 | 2019 |
| Leonard's Skipper | 1 | 2019 |
| Dukes' Skipper | 1 | 2019 |
| Roadside Skipper | 1 | 2019 |
| Acadian Hairstreak | 1 | 2019 |
| Gulf Fritillary | 1 | 2019 |
| Checkered Skipper | 1 | 2019 |
| Southern Pearly-eye | 1 | 2019 |
| Northern Hairstreak | 1 | 2019 |
| Harvester | 1 | 2019 |
| Olympia Marble | 1 | 2019 |
| Zarucco Duskywing | 1 | 2019 |
| Mulberrywing | 1 | 2019 |
| Northern Cloudywing | 1 | 2019 |
| Hickory Hairstreak | 1 | 2019 |
Illinois Butterfly Monitoring Network
The Illinois Butterfly Monitoring Network engages citizen scientists in the process of collecting quantitative data on butterfly populations.