List of cities with the letter O 12 letters in the city name. Cities starting with the first letter O 12 letters in the name.
| Name of the city in O 12 letters | Country |
|---|---|
| Oklahoma City | City in United States of America (USA) 12 letters on O |
| Overland Park | City in United States of America (USA) 12 letters on O |
| Ocean Springs | City in United States of America (USA) 12 letters on O |
| Ondokuzmayis | City in Turkey 12 letters on O |
| Ocna Sibiului | City in Romania 12 letters on O |
| Örnsköldsvik | City in Sweden 12 letters on O |