- Orinda, California
- Orlando, Florida
- Ormond Beach, Florida
- Oro-Medonte, Ontario
- Orono, Maine
- Ortonville, Michigan
- Ossining, New York
- Ostrander, Ohio
- Oswego, New York
- Otis, Oregon
- Overland Park, Kansas
- Oviedo, Florida
- Owasso, Oklahoma
- Owensboro, Kentucky
- Oxford, Florida
- Oxford, Georgia
- Oxford, Mississippi
- Oxford, North Carolina
- Oxford, Ohio
- Oxon Hill, Maryland
- Ozark, Arkansas
- Pace, Florida
- Paducah, Kentucky
- Palestine, Texas
- Palm Bay, Florida
- Palm Beach Gardens, Florida
- Palm Beach, Florida
- Palm Desert, California
- Palm Springs, California
- Palmer, Alaska
- Palmetto, Georgia
- Palmyra, Virginia
- Palo Alto, California
- Panama City Beach, Florida
- Pantego, Texas
- Paramus, New Jersey
- Park City, Utah
- Park Ridge, New Jersey
- Parker, Colorado
- Parkville, Missouri
