| On Top of the World Designated Place to Orangevale (California) | 2,309.83 mi (3,717.31 km) |
| On Top of the World Designated Place to Orchards (Washington) | 2,454.02 mi (3,949.36 km) |
| On Top of the World Designated Place to Orcutt (California) | 2,256.25 mi (3,631.08 km) |
| On Top of the World Designated Place to Oregon (Ohio) | 869.26 mi (1,398.94 km) |
| On Top of the World Designated Place to Oregon (Wisconsin) | 1,033.06 mi (1,662.55 km) |
| On Top of the World Designated Place to Oregon City (Oregon) | 2,451.36 mi (3,945.09 km) |
| On Top of the World Designated Place to Orem (Utah) | 1,829.61 mi (2,944.48 km) |
| On Top of the World Designated Place to Orinda (California) | 2,358.02 mi (3,794.86 km) |
| On Top of the World Designated Place to Orland Park (Illinois) | 918.59 mi (1,478.33 km) |
| On Top of the World Designated Place to Orlando (Florida) | 72.05 mi (115.96 km) |
| On Top of the World Designated Place to Ormond Beach (Florida) | 72.71 mi (117.02 km) |
| On Top of the World Designated Place to Oro Valley (Arizona) | 1,713.50 mi (2,757.62 km) |
| On Top of the World Designated Place to Oroville (California) | 2,333.19 mi (3,754.90 km) |
| On Top of the World Designated Place to Oshkosh (Wisconsin) | 1,087.04 mi (1,749.43 km) |
| On Top of the World Designated Place to Oskaloosa (Iowa) | 1,023.31 mi (1,646.86 km) |
