List of American Places Named After People - O

O

• O'Fallon, Missouri – John O. Fallon
• O'Neals, California – Charles O'Neal (merchant and first postmaster)
• Ockenden, California – Thomas J. Ockenden (first postmaster)
• Odem, Texas – David Odem (San Patricio County sheriff)
• Odenton, Maryland – Oden Bowie (Governor of Maryland)
• Ogden, Utah – Peter Skene Ogden
• Ogilby, California – E.R. Ogilby (mine promoter)
• Old Ornbaun Hot Springs, California – John S. Ornbaun (early settler and rancher)
• Olean, New York – Olean Shephard (the first white child born here)
• Oleander, California – William Oleander Johnson (first postmaster)
• Orange, 4 places in Connecticut/Massachusetts/New Jersey/Virginia – William, Prince of Orange
• Orange, Ohio – William, Prince of Orange (indirectly, via Orange, Connecticut)
• Ordbend, California – Edward Ord
• Orem, Utah – Walter C. Orem (President of the Salt Lake and Utah Electric Urban Railroad)
• Orford, New Hampshire – Robert Walpole, Earl of Orford
• Orinda, California – Katherine Philips (a poet whose nickname was "Matchless Orinda")
• Orlando, Florida – Orlando Reeves
• Orleans, Massachusetts – Louis Philippe II, Duke of Orléans
• Orloff, California – Orloff Miller (early settler)
• Ornbaun, California – John S. Ornbaumn (early settler and rancher)
• Orono, Maine – Chief Joseph Orono of the Penobscot Nation
• Orrs Springs, California – Samuel Orr (early settler)
• Orwood, California – Orville Y. Woodward (promoter)
• Osburn, Idaho – Bill Osborne (trading post establisher) (note spelling)
• Osceola County, Florida – Indian leader Osceola, whose name means "Black Drink Cry"
• Otis, Massachusetts – Harrison Gray Otis
• Otisfield, Maine – James Otis, Jr. (grantee)
• Ovid, Colorado – Newton Ovid (local resident)
• Owensboro, Kentucky – Abraham Owen
• Oxnard, California – Henry, Ben, James and Robert Oxnard