List of cities with the letter O 4 letters in the city name. Cities starting with the first letter O 4 letters in the name.
| Name of the city in O 4 letters | Country |
|---|---|
| Orem | City in United States of America (USA) 4 letters on O |
| Ondo | City in Nigeria 4 letters on O |
| Omsk | City in Russia 4 letters on O |
| Orsk | City in Russia 4 letters on O |
| Okha | City in Russia 4 letters on O |
| Oita | City in Japan 4 letters on O |
| Otsu | City in Japan 4 letters on O |
| Oshu | City in Japan 4 letters on O |
| Ordu | City in Turkey 4 letters on O |
| Oltu | City in Turkey 4 letters on O |
| Orly | City in France 4 letters on O |
| Osan | City in South Korea 4 letters on O |
| Oran | City in Algeria 4 letters on O |
| Oulu | City in Finland 4 letters on O |
| Ogre | City in Latvia 4 letters on O |
| Ossa | City in East Timor 4 letters on O |