60 birds were recorded seen in Ohio in September in our iNaturalist sample; 2 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

Great Blue Heron
Canada Goose

American Goldfinch

Mallard

Turkey Vulture

Great Egret

Double-crested Cormorant

Wood Duck

Ruby-throated Hummingbird

Red-tailed Hawk

Mourning Dove

Bald Eagle
All birds seen in Ohio in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 1,345 | May (past peak) |
| 2 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 914 | Apr (past peak) |
| 3 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 911 | Aug (past peak) |
| 4 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 874 | Apr (past peak) |
| 5 | Turkey Vulture | Cathartes aura | New World Vultures | 791 | Apr (past peak) |
| 6 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 746 | May (past peak) |
| 7 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 722 | Sep (peak) |
| 8 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 707 | Apr (past peak) |
| 9 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 628 | Aug (past peak) |
| 10 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 574 | Apr (past peak) |
| 11 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 563 | Apr (past peak) |
| 12 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 563 | May (past peak) |
| 13 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 563 | Apr (past peak) |
| 14 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 562 | May (past peak) |
| 15 | Bay-breasted Warbler | Setophaga castanea | New World Warblers | 521 | May (past peak) |
| 16 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 499 | May (past peak) |
| 17 | Magnolia Warbler | Setophaga magnolia | New World Warblers | 476 | May (past peak) |
| 18 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 450 | Apr (past peak) |
| 19 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 432 | Sep (peak) |
| 20 | Cape May Warbler | Setophaga tigrina | New World Warblers | 431 | May (past peak) |
| 21 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 416 | May (past peak) |
| 22 | House Sparrow | Passer domesticus | Old World Sparrows | 416 | May (past peak) |
| 23 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 393 | Apr (past peak) |
| 24 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 380 | Apr (past peak) |
| 25 | American Robin | Turdus migratorius | Thrushes | 377 | Apr (past peak) |
| 26 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 363 | May (past peak) |
| 27 | Northern Flicker | Colaptes auratus | Woodpeckers | 339 | Apr (past peak) |
| 28 | Tennessee Warbler | Leiothlypis peregrina | New World Warblers | 338 | May (past peak) |
| 29 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 308 | Jan (past peak) |
| 30 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 301 | Apr (past peak) |
| 31 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 300 | May (past peak) |
| 32 | Cedar Waxwing | Bombycilla cedrorum | Waxwings | 284 | Jun (past peak) |
| 33 | Swainson's Thrush | Catharus ustulatus | Thrushes | 284 | May (past peak) |
| 34 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 283 | Feb (past peak) |
| 35 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 276 | Jul (past peak) |
| 36 | American Redstart | Setophaga ruticilla | New World Warblers | 276 | May (past peak) |
| 37 | European Starling | Sturnus vulgaris | Starlings | 276 | Apr (past peak) |
| 38 | Gray Catbird | Dumetella carolinensis | Mockingbirds and Thrashers | 263 | May (past peak) |
| 39 | Osprey | Pandion haliaetus | Ospreys | 259 | Apr (past peak) |
| 40 | Ovenbird | Seiurus aurocapilla | New World Warblers | 258 | May (past peak) |
| 41 | Blackpoll Warbler | Setophaga striata | New World Warblers | 247 | May (past peak) |
| 42 | Black-throated Green Warbler | Setophaga virens | New World Warblers | 244 | May (past peak) |
| 43 | Eastern Bluebird | Sialia sialis | Thrushes | 241 | May (past peak) |
| 44 | Common Yellowthroat | Geothlypis trichas | New World Warblers | 222 | May (past peak) |
| 45 | Trumpeter Swan | Cygnus buccinator | Ducks, Geese, and Swans | 221 | May (past peak) |
| 46 | Nashville Warbler | Leiothlypis ruficapilla | New World Warblers | 219 | May (past peak) |
| 47 | Song Sparrow | Melospiza melodia | New World Sparrows | 214 | May (past peak) |
| 48 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 181 | Apr (past peak) |
| 49 | Red-eyed Vireo | Vireo olivaceus | Vireos, Shrike-Babblers, and Erpornis | 179 | May (past peak) |
| 50 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 178 | Apr (past peak) |