60 birds were recorded seen in Illinois in January in our iNaturalist sample; 7 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in January

Dark-eyed Junco

Northern Cardinal
Canada Goose

American Herring Gull

Common Goldeneye

Red-tailed Hawk

American Tree Sparrow
Downy Woodpecker

House Sparrow

Bald Eagle

Mallard

Black-capped Chickadee
All birds seen in Illinois in January
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 1,205 | Jan (peak) |
| 2 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 1,193 | Apr (rising) |
| 3 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 846 | Apr (rising) |
| 4 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 799 | Feb (rising) |
| 5 | Common Goldeneye | Bucephala clangula | Ducks, Geese, and Swans | 790 | Jan (peak) |
| 6 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 752 | Feb (rising) |
| 7 | American Tree Sparrow | Spizelloides arborea | New World Sparrows | 738 | Jan (peak) |
| 8 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 692 | Apr (rising) |
| 9 | House Sparrow | Passer domesticus | Old World Sparrows | 651 | Apr (rising) |
| 10 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 618 | Feb (rising) |
| 11 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 581 | Apr (rising) |
| 12 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 581 | Apr (rising) |
| 13 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 497 | Apr (rising) |
| 14 | Red-breasted Merganser | Mergus serrator | Ducks, Geese, and Swans | 425 | Mar (rising) |
| 15 | American Robin | Turdus migratorius | Thrushes | 406 | Apr (rising) |
| 16 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 405 | Mar (rising) |
| 17 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 400 | Apr (rising) |
| 18 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 391 | Aug (rising) |
| 19 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 387 | Apr (rising) |
| 20 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 375 | Sep (rising) |
| 21 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 361 | Mar (rising) |
| 22 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 310 | Apr (rising) |
| 23 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 293 | Feb (rising) |
| 24 | European Starling | Sturnus vulgaris | Starlings | 279 | Apr (rising) |
| 25 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 251 | May (rising) |
| 26 | Greater Scaup | Aythya marila | Ducks, Geese, and Swans | 228 | Feb (rising) |
| 27 | White-throated Sparrow | Zonotrichia albicollis | New World Sparrows | 216 | Apr (rising) |
| 28 | American Kestrel | Falco sparverius | Falcons and Caracaras | 203 | Mar (rising) |
| 29 | Redhead | Aythya americana | Ducks, Geese, and Swans | 182 | Feb (rising) |
| 30 | Hooded Merganser | Lophodytes cucullatus | Ducks, Geese, and Swans | 180 | Mar (rising) |
| 31 | Bufflehead | Bucephala albeola | Ducks, Geese, and Swans | 163 | Mar (rising) |
| 32 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 157 | Aug (rising) |
| 33 | Eastern Bluebird | Sialia sialis | Thrushes | 144 | May (rising) |
| 34 | Hairy Woodpecker | Leuconotopicus villosus | Woodpeckers | 143 | Apr (rising) |
| 35 | Northern Harrier | Circus hudsonius | Hawks, Eagles, and Kites | 140 | Jan (peak) |
| 36 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 138 | Apr (rising) |
| 37 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 133 | Sep (rising) |
| 38 | Song Sparrow | Melospiza melodia | New World Sparrows | 132 | Apr (rising) |
| 39 | Trumpeter Swan | Cygnus buccinator | Ducks, Geese, and Swans | 125 | Jan (peak) |
| 40 | Long-eared Owl | Asio otus | Typical Owls | 125 | Jan (peak) |
| 41 | Mute Swan | Cygnus olor | Ducks, Geese, and Swans | 124 | Apr (rising) |
| 42 | Red-breasted Nuthatch | Sitta canadensis | Nuthatches | 118 | Sep (rising) |
| 43 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 110 | Apr (rising) |
| 44 | Pine Siskin | Spinus pinus | Finches, Euphonias, and Allies | 109 | Oct (rising) |
| 45 | Fox Sparrow | Passerella iliaca | New World Sparrows | 108 | Mar (rising) |
| 46 | Greater White-fronted Goose | Anser albifrons | Ducks, Geese, and Swans | 104 | Feb (rising) |
| 47 | Redpoll | Acanthis flammea | Finches, Euphonias, and Allies | 104 | Feb (rising) |
| 48 | American Black Duck | Anas rubripes | Ducks, Geese, and Swans | 102 | Jan (peak) |
| 49 | Northern Flicker | Colaptes auratus | Woodpeckers | 100 | Apr (rising) |
| 50 | White-crowned Sparrow | Zonotrichia leucophrys | New World Sparrows | 99 | May (rising) |