| Waterfowl |
| Tundra Swan | Feb 7 2004 | Ocean City |
| Mute Swan | Feb 7 2004 | Ocean City |
| Snow Goose | Feb 7 2004 | Ocean City |
| Brant | Feb 7 2004 | Ocean City |
| Canada Goose | Feb 7 2004 | Ocean City |
| Wood Duck | Mar 28 2004 | Hughes Hollow |
| Green-winged Teal | Feb 21 2004 | Huntley Meadows and the Potomac |
| American Black Duck | Feb 7 2004 | Ocean City |
| Mallard | Feb 7 2004 | Ocean City |
| Northern Pintail | Feb 7 2004 | Ocean City |
| Blue-winged Teal | Mar 28 2004 | Hughes Hollow |
| Northern Shoveler | Feb 7 2004 | Ocean City |
| Gadwall | Jul 24 2004 | Huntley Meadows |
| Canvasback | Feb 7 2004 | Ocean City |
| Ring-necked Duck | Mar 28 2004 | Hughes Hollow |
| Lesser Scaup | Feb 7 2004 | Ocean City |
| Harlequin Duck | Feb 7 2004 | Ocean City |
| Long-tailed Duck | Feb 7 2004 | Ocean City |
| Black Scoter | Feb 7 2004 | Ocean City |
| Surf Scoter | Feb 7 2004 | Ocean City |
| Bufflehead | Feb 7 2004 | Ocean City |
| Hooded Merganser | Mar 28 2004 | Hughes Hollow |
| Common Merganser | Feb 21 2004 | Huntley Meadows and the Potomac |
| Red-breasted Merganser | Feb 7 2004 | Ocean City |
| Ruddy Duck | Feb 7 2004 | Ocean City |
| Grebes/Loons |
| Red-throated Loon | Feb 7 2004 | Ocean City |
| Common Loon | Feb 7 2004 | Ocean City |
| Pied-billed Grebe | Feb 21 2004 | Huntley Meadows and the Potomac |
| Gannets/Pelicans |
| Brown Pelican | Oct 23 2004 | Point Lookout |
| Cormorants |
| Great Cormorant | Feb 7 2004 | Ocean City |
| Double-crested Cormorant | Feb 7 2004 | Ocean City |
| Herons |
| American Bittern | Mar 28 2004 | Hughes Hollow |
| Great Blue Heron | Feb 7 2004 | Ocean City |
| Great Egret | Mar 28 2004 | Hughes Hollow |
| Snowy Egret | May 15 2004 | Bombay Hook |
| Green Heron | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Black-crowned Night-Heron | Aug 21 2004 | Delaware Marshes |
| Yellow-crowned Night-Heron | Aug 21 2004 | Delaware Marshes |
| Ibis/Vultures |
| Glossy Ibis | May 15 2004 | Bombay Hook |
| Black Vulture | May 9 2004 | Pennyfield Lock |
| Turkey Vulture | Feb 7 2004 | Ocean City |
| Hawks |
| Osprey | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Bald Eagle | Feb 7 2004 | Ocean City |
| Northern Harrier | Oct 23 2004 | Point Lookout |
| Sharp-shinned Hawk | May 9 2004 | Pennyfield Lock |
| Cooper's Hawk | May 9 2004 | Pennyfield Lock |
| Red-shouldered Hawk | Feb 21 2004 | Huntley Meadows and the Potomac |
| Red-tailed Hawk | Feb 7 2004 | Ocean City |
| Falcons |
| American Kestrel | Feb 7 2004 | Ocean City |
| Peregrine Falcon | Feb 7 2004 | Ocean City |
| Rails |
| American Coot | Feb 7 2004 | Ocean City |
| Plovers |
| Black-bellied Plover | May 15 2004 | Bombay Hook |
| Semipalmated Plover | May 15 2004 | Bombay Hook |
| Killdeer | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Oystercatchers/Stilts |
| Black-necked Stilt | May 15 2004 | Bombay Hook |
| American Avocet | May 15 2004 | Bombay Hook |
| Sandpipers |
| Greater Yellowlegs | May 15 2004 | Bombay Hook |
| Lesser Yellowlegs | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Solitary Sandpiper | May 15 2004 | Bombay Hook |
| Willet | May 15 2004 | Bombay Hook |
| Spotted Sandpiper | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Ruddy Turnstone | Feb 7 2004 | Ocean City |
| Sanderling | Feb 7 2004 | Ocean City |
| Semipalmated Sandpiper | May 15 2004 | Bombay Hook |
| Western Sandpiper | May 15 2004 | Bombay Hook |
| Least Sandpiper | May 15 2004 | Bombay Hook |
| Purple Sandpiper | Feb 7 2004 | Ocean City |
| Dunlin | May 15 2004 | Bombay Hook |
| Short-billed Dowitcher | May 15 2004 | Bombay Hook |
| Wilson's Snipe | Feb 21 2004 | Huntley Meadows and the Potomac |
| Red-necked Phalarope | May 15 2004 | Bombay Hook |
| Gulls |
| Laughing Gull | Aug 21 2004 | Delaware Marshes |
| Bonaparte's Gull | Feb 7 2004 | Ocean City |
| Ring-billed Gull | Feb 7 2004 | Ocean City |
| Herring Gull | Feb 7 2004 | Ocean City |
| Great Black-backed Gull | Feb 7 2004 | Ocean City |
| Terns |
| Caspian Tern | Aug 21 2004 | Delaware Marshes |
| Common Tern | May 15 2004 | Bombay Hook |
| Forster's Tern | May 15 2004 | Bombay Hook |
| Least Tern | Aug 21 2004 | Delaware Marshes |
| Black Tern | Aug 21 2004 | Delaware Marshes |
| Doves |
| Rock Pigeon | Feb 7 2004 | Ocean City |
| Mourning Dove | Feb 21 2004 | Huntley Meadows and the Potomac |
| Cuckoos |
| Yellow-billed Cuckoo | May 9 2004 | Pennyfield Lock |
| Owls |
| Barred Owl | Mar 28 2004 | Hughes Hollow |
| Nightjars/Swifts |
| Common Nighthawk | Sep 12 2004 | Rock Creek Park |
| Chimney Swift | May 9 2004 | Pennyfield Lock |
| Hummingbirds/Kingfishers |
| Ruby-throated Hummingbird | May 9 2004 | Pennyfield Lock |
| Belted Kingfisher | Mar 28 2004 | Hughes Hollow |
| Woodpeckers |
| Red-headed Woodpecker | Mar 28 2004 | Hughes Hollow |
| Red-bellied Woodpecker | Feb 21 2004 | Huntley Meadows and the Potomac |
| Yellow-bellied Sapsucker | Mar 28 2004 | Hughes Hollow |
| Downy Woodpecker | Feb 21 2004 | Huntley Meadows and the Potomac |
| Hairy Woodpecker | Feb 21 2004 | Huntley Meadows and the Potomac |
| Northern Flicker | Mar 28 2004 | Hughes Hollow |
| Pileated Woodpecker | Mar 28 2004 | Hughes Hollow |
| Flycatchers |
| Eastern Wood-Pewee | May 9 2004 | Pennyfield Lock |
| Yellow-bellied Flycatcher | Sep 12 2004 | Rock Creek Park |
| Acadian Flycatcher | May 9 2004 | Pennyfield Lock |
| Eastern Phoebe | Mar 28 2004 | Hughes Hollow |
| Great Crested Flycatcher | May 9 2004 | Pennyfield Lock |
| Eastern Kingbird | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Vireos |
| White-eyed Vireo | Jun 6 2004 | Little Bennett |
| Yellow-throated Vireo | May 9 2004 | Pennyfield Lock |
| Red-eyed Vireo | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Corvids |
| Blue Jay | Feb 21 2004 | Huntley Meadows and the Potomac |
| American Crow | Feb 7 2004 | Ocean City |
| Fish Crow | Feb 7 2004 | Ocean City |
| Larks/Swallows |
| Purple Martin | May 15 2004 | Bombay Hook |
| Tree Swallow | Mar 28 2004 | Hughes Hollow |
| Northern Rough-winged Swallow | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Barn Swallow | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Chickadees/Creepers/Nuthatches |
| Carolina Chickadee | Feb 7 2004 | Ocean City |
| Tufted Titmouse | Feb 21 2004 | Huntley Meadows and the Potomac |
| Red-breasted Nuthatch | Oct 23 2004 | Point Lookout |
| White-breasted Nuthatch | Feb 21 2004 | Huntley Meadows and the Potomac |
| Brown-headed Nuthatch | Feb 7 2004 | Ocean City |
| Brown Creeper | Mar 28 2004 | Hughes Hollow |
| Wrens |
| Carolina Wren | Feb 21 2004 | Huntley Meadows and the Potomac |
| House Wren | Sep 12 2004 | Rock Creek Park |
| Marsh Wren | May 15 2004 | Bombay Hook |
| Gnatcatchers/Kinglets |
| Golden-crowned Kinglet | Oct 23 2004 | Point Lookout |
| Ruby-crowned Kinglet | Mar 28 2004 | Hughes Hollow |
| Blue-gray Gnatcatcher | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Thrushes |
| Eastern Bluebird | Feb 21 2004 | Huntley Meadows and the Potomac |
| Veery | Sep 12 2004 | Rock Creek Park |
| Swainson's Thrush | Sep 12 2004 | Rock Creek Park |
| Hermit Thrush | Oct 23 2004 | Point Lookout |
| Wood Thrush | May 9 2004 | Pennyfield Lock |
| American Robin | Feb 21 2004 | Huntley Meadows and the Potomac |
| Mimids |
| Gray Catbird | May 9 2004 | Pennyfield Lock |
| Northern Mockingbird | Feb 7 2004 | Ocean City |
| Brown Thrasher | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Pipits/Starlings/Waxwings |
| Cedar Waxwing | Feb 21 2004 | Huntley Meadows and the Potomac |
| European Starling | Feb 7 2004 | Ocean City |
| Wood Warblers |
| Blue-winged Warbler | Jun 6 2004 | Little Bennett |
| Nashville Warbler | May 9 2004 | Pennyfield Lock |
| Northern Parula | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Yellow Warbler | May 15 2004 | Bombay Hook |
| Chestnut-sided Warbler | Sep 12 2004 | Rock Creek Park |
| Magnolia Warbler | May 9 2004 | Pennyfield Lock |
| Black-throated Blue Warbler | May 9 2004 | Pennyfield Lock |
| Yellow-rumped Warbler | Mar 28 2004 | Hughes Hollow |
| Black-throated Green Warbler | May 9 2004 | Pennyfield Lock |
| Pine Warbler | Nov 20 2004 | Blackwater NWR |
| Prairie Warbler | Jun 6 2004 | Little Bennett |
| Palm Warbler | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Black-and-white Warbler | Sep 12 2004 | Rock Creek Park |
| American Redstart | Sep 12 2004 | Rock Creek Park |
| Prothonotary Warbler | May 9 2004 | Pennyfield Lock |
| Worm-eating Warbler | Jun 6 2004 | Little Bennett |
| Ovenbird | Jun 6 2004 | Little Bennett |
| Louisiana Waterthrush | May 9 2004 | Pennyfield Lock |
| Kentucky Warbler | Jun 6 2004 | Little Bennett |
| Common Yellowthroat | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Canada Warbler | May 9 2004 | Pennyfield Lock |
| Tanagers |
| Summer Tanager | Aug 21 2004 | Delaware Marshes |
| Scarlet Tanager | May 9 2004 | Pennyfield Lock |
| Sparrows |
| Eastern Towhee | Mar 28 2004 | Hughes Hollow |
| Chipping Sparrow | May 15 2004 | Bombay Hook |
| Field Sparrow | Feb 21 2004 | Huntley Meadows and the Potomac |
| Seaside Sparrow | May 15 2004 | Bombay Hook |
| Song Sparrow | Feb 7 2004 | Ocean City |
| Swamp Sparrow | Feb 21 2004 | Huntley Meadows and the Potomac |
| White-throated Sparrow | Feb 7 2004 | Ocean City |
| White-crowned Sparrow | Oct 23 2004 | Point Lookout |
| Dark-eyed Junco | Feb 7 2004 | Ocean City |
| Blackbirds/Grosbeaks |
| Northern Cardinal | Feb 7 2004 | Ocean City |
| Rose-breasted Grosbeak | Sep 12 2004 | Rock Creek Park |
| Blue Grosbeak | Aug 21 2004 | Delaware Marshes |
| Indigo Bunting | Apr 24 2004 | Kenilworth Aquatic Gardens |
| Red-winged Blackbird | Feb 7 2004 | Ocean City |
| Rusty Blackbird | Sep 12 2004 | Rock Creek Park |
| Common Grackle | Feb 21 2004 | Huntley Meadows and the Potomac |
| Boat-tailed Grackle | May 15 2004 | Bombay Hook |
| Brown-headed Cowbird | May 9 2004 | Pennyfield Lock |
| Orchard Oriole | May 9 2004 | Pennyfield Lock |
| Baltimore Oriole | May 9 2004 | Pennyfield Lock |
| Eastern Meadowlark | Nov 20 2004 | Blackwater NWR |
| Finches |
| Purple Finch | Mar 28 2004 | Hughes Hollow |
| House Finch | Feb 7 2004 | Ocean City |
| American Goldfinch | Feb 21 2004 | Huntley Meadows and the Potomac |
| Weaver Finches |
| House Sparrow | Apr 24 2004 | Kenilworth Aquatic Gardens |
