60 birds were recorded seen in Maryland in September in our iNaturalist sample; 6 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
Common Yellowthroat

Bald Eagle

Laughing Gull

Ruby-throated Hummingbird

Double-crested Cormorant

Mallard

Northern Cardinal

American Goldfinch

Eastern Wood-Pewee

Mourning Dove

Green Heron
All birds seen in Maryland in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 1,255 | May (past peak) |
| 2 | Common Yellowthroat | Geothlypis trichas | New World Warblers | 780 | May (past peak) |
| 3 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 749 | Jan (past peak) |
| 4 | Laughing Gull | Leucophaeus atricilla | Gulls, Terns, and Skimmers | 694 | Sep (peak) |
| 5 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 639 | Aug (past peak) |
| 6 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 549 | Apr (past peak) |
| 7 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 544 | Apr (past peak) |
| 8 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 518 | Apr (past peak) |
| 9 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 514 | Apr (past peak) |
| 10 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 494 | Sep (peak) |
| 11 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 473 | Apr (past peak) |
| 12 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 462 | Aug (past peak) |
| 13 | Turkey Vulture | Cathartes aura | New World Vultures | 441 | Apr (past peak) |
| 14 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 440 | Apr (past peak) |
| 15 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 439 | Apr (past peak) |
| 16 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 428 | Jan (past peak) |
| 17 | Magnolia Warbler | Setophaga magnolia | New World Warblers | 427 | Sep (peak) |
| 18 | American Redstart | Setophaga ruticilla | New World Warblers | 424 | May (past peak) |
| 19 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 417 | Aug (past peak) |
| 20 | Gray Catbird | Dumetella carolinensis | Mockingbirds and Thrashers | 397 | May (past peak) |
| 21 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 394 | Apr (past peak) |
| 22 | Black-and-white Warbler | Mniotilta varia | New World Warblers | 392 | May (past peak) |
| 23 | Eastern Bluebird | Sialia sialis | Thrushes | 385 | Apr (past peak) |
| 24 | House Sparrow | Passer domesticus | Old World Sparrows | 358 | Apr (past peak) |
| 25 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 344 | Jan (past peak) |
| 26 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 342 | Oct (rising) |
| 27 | Red-eyed Vireo | Vireo olivaceus | Vireos, Shrike-Babblers, and Erpornis | 341 | May (past peak) |
| 28 | Osprey | Pandion haliaetus | Ospreys | 336 | Apr (past peak) |
| 29 | Northern Parula | Setophaga americana | New World Warblers | 334 | May (past peak) |
| 30 | Carolina Wren | Thryothorus ludovicianus | Wrens | 329 | Apr (past peak) |
| 31 | Cape May Warbler | Setophaga tigrina | New World Warblers | 319 | Sep (peak) |
| 32 | Northern Flicker | Colaptes auratus | Woodpeckers | 314 | Apr (past peak) |
| 33 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 308 | Apr (past peak) |
| 34 | Black-throated Green Warbler | Setophaga virens | New World Warblers | 302 | Sep (peak) |
| 35 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 301 | Jan (past peak) |
| 36 | Black Vulture | Coragyps atratus | New World Vultures | 283 | Apr (past peak) |
| 37 | Carolina Chickadee | Poecile carolinensis | Tits, Chickadees, and Titmice | 276 | Apr (past peak) |
| 38 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 262 | Apr (past peak) |
| 39 | Ovenbird | Seiurus aurocapilla | New World Warblers | 259 | May (past peak) |
| 40 | Chipping Sparrow | Spizella passerina | New World Sparrows | 249 | Apr (past peak) |
| 41 | American Robin | Turdus migratorius | Thrushes | 239 | Apr (past peak) |
| 42 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 230 | Oct (rising) |
| 43 | European Starling | Sturnus vulgaris | Starlings | 230 | Apr (past peak) |
| 44 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 225 | Mar (past peak) |
| 45 | Tufted Titmouse | Baeolophus bicolor | Tits, Chickadees, and Titmice | 224 | Apr (past peak) |
| 46 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 222 | Mar (past peak) |
| 47 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 212 | Apr (past peak) |
| 48 | Broad-winged Hawk | Buteo platypterus | Hawks, Eagles, and Kites | 203 | Sep (peak) |
| 49 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 202 | Apr (past peak) |
| 50 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 195 | Jan (past peak) |