Frontier Forts – O Forts

Oak Creek Fort on, Texas – Fort Chadbourne.
Oak Island Fort on, North Carolina – Fort Caswell.
Oakland Fort, Florida – Five miles from Fort Doane.
Oak Point, Fort, North Carolina – At Wilmington.
Oblong Redoubt, New York – Near West Point.
O’Brien Fort, Maine.
Observation Camp, Maryland – Near Poolesville.
Ocilla, Fort, Florida – Between Ocilla and Wacissa rivers.
Ocklawaha Fort, Florida – Near Apalachicola.
Ocklockony River Fort on, Florida – Thirty miles from the sea.
Ockracoke Inlet Fort at, North Carolina – Fort Morgan.
Ocmulgee Fort, Georgia
Ogden Fort, Florida – De Soto County; now town of that name, near Pease River, on Southern Railway.
Ogeechee Fort, Georgia – Near the Ogeechee River.
Oglethorpe (old) Barracks, Georgia – On St. Simons Island.
Oglethorpe Barracks, Georgia – At Savannah.
Oglethorpe, Fort, Georgia- At Savannah.
Ohio Falls Fort at, Indiana – Opposite Louisville, KentucKentucky
Ohio State Soldiers’ Home, Sandusky, Ohio.
Ojo Calienti Camp at, New Mexico – An outpost of Fort Craig.
Okanagon Fort, Washington – On Columbia River, at its junction with the Okanagon.
Olden Camp, New Jersey – At Trenton.
Old Gate General Hospital, Tennessee – At Memphis.
Old Point Comfort, Fort at, Virginia – Fort Monroe.
Old State General Hospital, Tennessee – At Memphis.
Old Tappan Cantonment at, New Jersey.
Old Topsail Inlet Fort, North Carolina -{See Topsail Inlet, old.)
Old Tower Georgia – On Tybee Island.
Olive Bend Creek Stockade, Ohio – Near Waterford.
Olmstead Camp, Virginia – Near Falls Church.
Olmus Camp, Texas – Near San Antonio.
Olney, Stephen, Camp, South Carolina – At Hilton Head.
Olympia Camp, Vermont – At Burlington.
Omaha Barracks or Fort, Nebraska – At Omaha.
O’Meary Lunette, Tennessee – At Chattanooga
One Number Fort, Florida – Eleven miles from Indian River.
One Number Fort, Georgia – Near Savannah.
One Number Battery, Kentucky- Near Island No. 10.
One Number Fort, Massachusetts – On Charles River.
One Number Battery, Virginia – On Wormsley Creek.
Oneida Fort at, New York – Fort Bull.
Onion River Fort on, Vermont.
Onondaga Battery, Virginia.
Ontario Fort, New York- At Oswego, on site of old Fort Pepperell.
Onward Camp, Georgia – At Savannah.
Onyades Fort, New York.
Opelika Fort, Alabama – At Opelika.
Oplandt Fort, New Jersey – Near Lewiston.
Orange (1) Fort, New York – At Bowling Green.
Orange (2) Fort, New York – At Albany.
Ord Camp, Arizona – Now Fort Apache.
Oregon Fort, North Carolina – At Ocracoke Inlet.
Oregon State Soldiers’ Home, Roseburg, Oregon.
Orford Fort, Oregon – At Port Orford.
Orleans Fort, Missouri – Near mouth of the Osage.
O’Rourke Battery, South Carolina – On Morris Island.
O’Rourke Fort, Virginia – A defense of Washington, D. C.
Orr Camp, Pennsylvania – Near Kittanning.
Osage Fort, Missouri – On Missouri River, near present site of Sibley.
Osao Fort, New York – At Auburn.
Osborne Camp, Idaho – At Osburn.
Osceola, Fort, Arkansas – At Plum Point, Mississippi River.
Osceola Battery, Florida – At Key West.
Osoyoos Camp, Washington- On Lake Osoyoos, Okinakane Valley.
Ossabaw Sound Fortifications at, Georgia
Ossippee Pond Fort at, New Hampshire.
Oswegatchie Fort, New York – Near Ogdensburg.
Oswego Fort, New York – Present site of Fort Ontario; originally Fort Pepperell.
Otis Camp, Hawaii – At Honolulu.
Otter Island Fort on, South Carolina – St. Helena Sound, Fort Drayton.
Ouatanon or Oulatenon or Ouachtanon Fort, Indiana – On Wabash River, near Lafayette.
Overalls Creek Blockhouse on, Tennessee – Near Murfreesboro.
Overton General Hospital, Tennessee – At Memphis.
Overton Hill Fortifications on, Tennessee – Five miles south of Nashville.
Owen Fort, Montana – On Bitter Root or St. Marys River.
Owen Fort, Virginia – At Petersburg.
Owyhee River Camp, Idaho – Opposite Fort Boise.
Ox Fort, New York – Near source of Allegheny.
Oxford Fort at, Massachusetts.
Oxford Park Camp at, Pennsylvania – Three miles from Frankford.
Oyster Bay Cantonment at, New York – On Long Island.
Oyster Island Battery, New York – On Ellis Island.
Oyster River, Maine – Fortified houses on.

Forts, History,

War Department, Adjutant General's Office, Returns Division. List of Military Posts Etc. Established in the United States from its Earliest Settlement to the Present Time. Washington: Government Printing Office. 1902.

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