O'Brien, Lewis Magher [1 subentry]

O'Brien, Richard [10 subentries]

Occupations [2 subentries]

Octavia (U.S. ship) [1 reference]

Oddy, Joshua Jepson [1 subentry]

Odessa, Russia [1 reference]

Ogden, Abraham [1 reference]

Ogden, Schwartz and Co. (Marseilles merchants) [2 references]

Ohio [2 references + 4 subentries]

Ohio River [1 reference + 1 subentry]

Oldenburg, Duke of (Peter Friedrich Ludwig) [1 subentry]

Oldenburg, Germany [1 reference]

Old Medley (stallion) [1 reference]

Old Selima (mare) [1 reference]

Olive Branch (U.S. ship; Capt. William Bryant) [2 references]

Olivera, House of [1 subentry]

Omera, Capt. (carries wine for JM) [1 reference]

Oostende (Ostend), Belgium [1 reference]

Opelousas, La. [2 references]

Oporto [See redirect]

Orange Company [1 subentry]

Orange County, Va. [3 references + 2 subentries]

Orange Courthouse, Va. [1 reference + 1 subentry]

Orange Town (Orangeburg), N.Y. [1 reference]

Orde, Admiral Sir John [2 references + 1 subentry]

Orlando (U.S. ship) [2 references]

Orleans Gazette [2 references]

Orleans Gazette, For the Country [2 references]

Orleans Territory [17 subentries + 5 “see also” entries]

Orleans Volunteers [1 reference]

Orso, Antoine [2 references]

Orso, M. (father of Mlle. Orso) [1 reference]

Orso, Mlle. (elopes with 2nd Lt. Joseph Doyle) [2 references]

Orue y Gorvea, Don José [1 reference]

Osgood, Samuel [1 subentry]

Othello (stallion) [1 reference]

Otis, Harrison Gray [1 reference]

Otis, Joseph [1 subentry]

Otis, Samuel [1 subentry]

Otis, William [1 reference + 1 subentry]

Ottoman Empire [4 references]

Ouabache [See redirect]

Ouachita District, La. [1 reference]

Ouachita River, La. [2 references]

Oubril, Pierre Yakovlevich d' [1 subentry]

Owens, Mr. (murder victim) [1 reference]

Oxford University [1 reference]