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Battery C Site (Phillips County, Arkansas)
Battery Cheves (Charleston County, South Carolina)
Battery D (Phillips County, Arkansas)
Battery Gadsden (Charleston County, South Carolina)
Battery Hawkins (Honolulu County, Hawaii)
Battery Hawkins Annex (Honolulu County, Hawaii)
Battery Jackson (Honolulu County, Hawaii)
Battery John Barlow and Saxton (Los Angeles County, California)
Battery LeRoy (Charleston County, South Carolina)
Battery No. 1 (Charleston County, South Carolina)
Battery No. 5 (Charleston County, South Carolina)
Battery Osgood-Farley (Los Angeles County, California)
Former gun battery that protected the Los Angeles Harbor until World War II.
Battery Thomson (Charleston County, South Carolina)
Battery Tynes (Charleston County, South Carolina)
Battery White (Georgetown County, South Carolina)
Battery Wilkes (Charleston County, South Carolina)
Beattie's Prairie (Delaware County, Oklahoma)
Big Hill Pond Fortification (McNairy County, Tennessee)
Blockhouse Site (Polk County, North Carolina)
Box Elder Flouring Mill (Box Elder County, Utah)
Brabson House (Hamilton County, Tennessee)
Brandywine Battlefield (Delaware County, Pennsylvania)
Burr's Ferry Earthworks (Vernon Parish, Louisiana)
Bushy Run Battlefield (Westmoreland County, Pennsylvania)
Byrnside-Beirne-Johnson House (Monroe County, West Virginia)
Camp Lyon Site (Owyhee County, Idaho)
Captain Jack's Stronghold (Siskiyou County, California)
Casemate Fort, Whiting Quadrangle (Kings County, New York)
Castle Clinton National Monument (New York County, New York)
Castle Pinckney (Charleston County, South Carolina)
Castle Williams (New York County, New York)
Cedar Creek Battlefield and Belle Grove (Unspecified county, Virginia)
Cheyney Clow's Rebellion, Scene of (Kent County, Delaware)
Civil War Earthworks at Tallahatchie Crossing (Marshall County, Mississippi)
Civil War Fort Sites (Washington, District of Columbia)
Civil War Fortification (Hamilton County, Tennessee)
Civil War Fortification at Barnesville (Reynolds County, Missouri)
Columbus-Belmont Civil War State Park (Hickman County, Kentucky)
Commandant's Quarters (Wayne County, Michigan)
Conanicut Battery (Newport County, Rhode Island)
Confederate Earthworks (Grenada County, Mississippi)
Cove Fort (Millard County, Utah)
Dorchester Heights National Historic Site (Suffolk County, Massachusetts)
El Castillo (Monterey County, California)
El Pueblo (Pueblo County, Colorado)
Eli May House (Jefferson County, Wisconsin)
Elk Mountain Mission Fort Site (Grand County, Utah)
Federal Fortifications Along Bear Creek (Warren County, Mississippi)
Federal Siege Trench (Alcorn County, Mississippi)
Five Forks Battlefield (Dinwiddie County, Virginia)
Flanders Callaway House (Warren County, Missouri)
Fort Abercrombie (Richland County, North Dakota)
Fort Adams Site (Wilkinson County, Mississippi)
Fort Arbuckle Site (Tulsa County, Oklahoma)
Fort Ashby (Mineral County, West Virginia)
Built by George Washington in 1755.
Fort Assinniboine (Hill County, Montana)
Fort Astoria (Clatsop County, Oregon)
Fort Atkinson (Washington County, Nebraska)
Fort Atkinson (Winneshiek County, Iowa)
Ruins of fort built to protect the Ho-Chunk (Winnebago)
Fort Baldwin Historic Site (Sagadahoc County, Maine)
Fort Barton Site (Newport County, Rhode Island)
Fort Belknap (Young County, Texas)
Fort Benton (Wayne County, Missouri)
Fort Blount-Williamsburg Site (Jackson County, Tennessee)
Fort Bonneville (Sublette County, Wyoming)
Fort Boreman (Wood County, West Virginia)
Fort Branch Site (Martin County, North Carolina)
Fort Brewerton (Oswego County, New York)
Fort Brown (Cameron County, Texas)
Fort Brown Site (Clinton County, New York)
Fort Buhlow (Rapides Parish, Louisiana)
Fort C.F. Smith (Warren County, Kentucky)
Fort Churchill (Lyon County, Nevada)
Fort Cobb Site (Caddo County, Oklahoma)
Fort Collier (Frederick County, Virginia)
Fort Conde-Charlotte (Mobile County, Alabama)
Fort Constitution (Rockingham County, New Hampshire)
Fort Crafford (Newport News, Virginia)
Fort Craig (Socorro County, New Mexico)
Fort Crook (Site) (Shasta County, California)
Fort Crown Point (Essex County, New York)
Fort D (Cape Girardeau County, Missouri)
Site of a Civil War fort
Fort D Blockhouse (Cape Girardeau County, Missouri)
Replica stone blockhouse built as a Works Progress Administration project at the site of the Civil War Fort D
Fort Davis (Muskogee County, Oklahoma)
Fort Davis National Historic Site (Jeff Davis County, Texas)
Fort de Chartres (Randolph County, Illinois)
Fort Dearborn Site (Adams County, Mississippi)
Fort Decker (Orange County, New York)
Fort Defiance Park (Defiance County, Ohio)
Fort Delaware on Pea Patch Island (New Castle County, Delaware)
Fort Deseret (Millard County, Utah)
Fort Desoto Batteries (Pinellas County, Florida)
Fort Dobbs (Iredell County, North Carolina)
Fort Drummond (Chippewa County, Michigan)
Fort Duncan (Maverick County, Texas)
Fort Edgecomb (Lincoln County, Maine)
Fort Fisher (New Hanover County, North Carolina)
Fort Fizzle Site (Missoula County, Montana)
Fort Flagler (Jefferson County, Washington)
Fort Frederick State Park (Washington County, Maryland)
Fort Gadsden Historic Memorial (Franklin County, Florida)
Fort Gaines (Mobile County, Alabama)
Fort Garland (Costilla County, Colorado)
Fort Garrison (Baltimore County, Maryland)
Fort George (Hancock County, Maine)
Fort Gibson (Muskogee County, Oklahoma)
Fort Gorges (Cumberland County, Maine)
Fort Granger (Williamson County, Tennessee)
Civil War fort built by the Union Army
Fort Griffin (Shackelford County, Texas)
Fort Griswold (New London County, Connecticut)
Fort Halifax (Kennebec County, Maine)
Fort Hall Site (Bingham County, Idaho)
Fort Harker (Jackson County, Alabama)
A military fortification built by the Union Army during the American Civil War.
Fort Harmony Site (Washington County, Utah)
Fort Henry Site (Stewart County, Tennessee)
Fort Hill (Cuyahoga County, Ohio)
Fort Hollingsworth--White House (Banks County, Georgia)
Fort Howell (Beaufort County, South Carolina)
Civil War Era Fort
Fort Hunt (Fairfax County, Virginia)
Fort Independence (Suffolk County, Massachusetts)
Fort Jackson (Plaquemines Parish, Louisiana)
Fort James Jackson (Chatham County, Georgia)
Fort Jay (New York County, New York)
Fort Jefferson Site (Darke County, Ohio)
Fort Jesup (Sabine Parish, Louisiana)
Fort Johnson/Powder Magazine (Charleston County, South Carolina)
Fort Kent (Aroostook County, Maine)
Fort King George (McIntosh County, Georgia)
Fort Knox State Park (Waldo County, Maine)
Fort Laurens Site (Tuscarawas County, Ohio)
Fort Leaton (Presidio County, Texas)
Fort Leavenworth (Leavenworth County, Kansas)
Fort Leflore (Leflore County, Mississippi)
Fort Ligonier (Westmoreland County, Pennsylvania)
Fort Livingston (Jefferson Parish, Louisiana)
Fort Lookout (Ouachita County, Arkansas)
Fort Loudoun (Monroe County, Tennessee)
Fort Lytle (Warren County, Kentucky)
Fort Mackinac (Mackinac County, Michigan)
Fort Macomb (Orleans Parish, Louisiana)
Fort Macon (Carteret County, North Carolina)
Fort Marcy Ruins (Santa Fe County, New Mexico)
Fort Marrow (Randolph County, West Virginia)
Fort Mason (Mason County, Texas)
Fort Site with Reconstructed Officer's Quarters
Fort Massac Site (Massac County, Illinois)
Fort Massachusetts (Harrison County, Mississippi)
Fort Matanzas National Monument (St. Johns County, Florida)
Fort McAllister (Bryan County, Georgia)
Fort McClary (York County, Maine)
Fort McIntosh (Webb County, Texas)
Fort Meigs (Wood County, Ohio)
Fort Michilimackinac (Emmet County, Michigan)
Fort Mifflin (Philadelphia County, Pennsylvania)
Fort Mitchell Historic Site (Russell County, Alabama)
The park features a reconstruction of the 1813 stockade fort that was an important post in the Creek War, a museum with exhibits about the fort's history and a collection of historic carriages, a restored 19th century log home, and a visitor center.
Fort Monmouth Historic District (Monmouth County, New Jersey)
Fort Monroe (Hampton, Virginia)
Fort Moultrie (Charleston County, South Carolina)
Historic fort in Sullivan's Island, SC
Fort Nashborough (Davidson County, Tennessee)
Fort Negley (Davidson County, Tennessee)
Fort Ninigret (Washington County, Rhode Island)
Fort Nisqually Granary and Factor's House (Pierce County, Washington)
Fort Nisqually Site (Pierce County, Washington)
Fort No. 2 at Yellow Bayou (Avoyelles Parish, Louisiana)
Fort No. 5 (Russell County, Alabama)
Fort Norfolk (Norfolk, Virginia)
Fort Ontario (Oswego County, New York)
Fort Orange Archeological Site (Albany County, New York)
Fort Osage (Jackson County, Missouri)
Fort Owen (Ravalli County, Montana)
Fort Palmetto (Charleston County, South Carolina)
Fort Peabody (San Miguel County, Colorado)
Fort Pearce (Washington County, Utah)
Fort Pemberton Site (Leflore County, Mississippi)
Fort Phantom Hill (Jones County, Texas)
Fort Philip Long (Page County, Virginia)
Fort Phoenix (Bristol County, Massachusetts)
Fort Pickens (Escambia County, Florida)
Fort Pickering (Essex County, Massachusetts)
Fort Pike (Orleans Parish, Louisiana)
Fort Pillow (Lauderdale County, Tennessee)
Fort Pitt (Allegheny County, Pennsylvania)
Fort Pocahontas (Charles City County, Virginia)
Fort Popham Memorial (Sagadahoc County, Maine)
Fort Pownall Memorial (Waldo County, Maine)
Fort Pringle (Charleston County, South Carolina)
Fort Proctor (St. Bernard Parish, Louisiana)
Fort Raleigh National Historic Site (Dare County, North Carolina)
Fort Randolph (Rapides Parish, Louisiana)
Fort Reading (Site) (Shasta County, California)
Fort Reno (Canadian County, Oklahoma)
Fort Reno (Johnson County, Wyoming)
Fort Richardson (Jack County, Texas)
Fort Roberdeau (Blair County, Pennsylvania)
Fort Ross (Sonoma County, California)
Fort Ruby (White Pine County, Nevada)
Fort San Marcos de Apalache (Wakulla County, Florida)
Fort Scammon (Kanawha County, West Virginia)
Fort Schuyler (Bronx County, New York)
Fort Sewall (Essex County, Massachusetts)