Cities in United States ( 10,163 )
- Oakton, Virginia
- Oakville, Connecticut
- Oakville, Missouri
- Oakwood, Cuyahoga County, Ohio
- Oakwood, Georgia
- Oakwood, Georgia
- Oakwood, Ohio
- Oasis
- Oatfield, Oregon
- Oberlin, Ohio
- Obetz
- Ocala
- Ocean Acres
- Ocean Bluff-Brant Rock
- Ocean City, Florida
- Ocean City, Maryland
- Ocean City, New Jersey
- Ocean Grove
- Ocean Grove, Massachusetts
- Ocean Pines
- Ocean Shores, Washington
- Ocean Springs
- Oceano, California
- Oceanport
- Oceanside, California
- Oceanside, New York
- Ocilla
- Ocoee, Florida
- Oconomowoc
- Oconto Falls
- Oconto, Wisconsin
- Odenton
- Odenville
- Odessa
- Odessa, Florida
- Odessa, Missouri