| Gateway to Oswego (Illinois) | 1,108.71 mi (1,784.29 km) |
| Gateway to Oswego (New York) | 1,202.27 mi (1,934.87 km) |
| Gateway to Otsego (Minnesota) | 1,448.39 mi (2,330.96 km) |
| Gateway to Ottawa (Illinois) | 1,097.61 mi (1,766.43 km) |
| Gateway to Ottawa (Kansas) | 1,141.59 mi (1,837.22 km) |
| Gateway to Ottumwa (Iowa) | 1,168.77 mi (1,880.95 km) |
| Gateway to Overland (Missouri) | 974.94 mi (1,569.01 km) |
| Gateway to Overland Park (Kansas) | 1,132.87 mi (1,823.18 km) |
| Gateway to Overlea (Maryland) | 933.40 mi (1,502.16 km) |
| Gateway to Oviedo (Florida) | 147.62 mi (237.57 km) |
| Gateway to Owasso (Oklahoma) | 1,065.44 mi (1,714.65 km) |
| Gateway to Owatonna (Minnesota) | 1,369.11 mi (2,203.38 km) |
| Gateway to Owensboro (Kentucky) | 833.39 mi (1,341.21 km) |
| Gateway to Owings Mills (Maryland) | 931.50 mi (1,499.10 km) |
| Gateway to Owosso (Michigan) | 1,142.47 mi (1,838.63 km) |
