| Entroncamento to Oswego (Illinois) | 4,034.49 mi (6,492.89 km) |
| Entroncamento to Oswego (New York) | 3,433.94 mi (5,526.40 km) |
| Entroncamento to Otsego (Minnesota) | 4,157.26 mi (6,690.46 km) |
| Entroncamento to Ottawa (Illinois) | 4,067.32 mi (6,545.71 km) |
| Entroncamento to Ottawa (Kansas) | 4,457.58 mi (7,173.79 km) |
| Entroncamento to Ottumwa (Iowa) | 4,242.98 mi (6,828.42 km) |
| Entroncamento to Overland (Missouri) | 4,226.18 mi (6,801.37 km) |
| Entroncamento to Overland Park (Kansas) | 4,420.72 mi (7,114.46 km) |
| Entroncamento to Overlea (Maryland) | 3,539.39 mi (5,696.10 km) |
| Entroncamento to Oviedo (Florida) | 4,117.82 mi (6,627.00 km) |
| Entroncamento to Owasso (Oklahoma) | 4,568.50 mi (7,352.29 km) |
| Entroncamento to Owatonna (Minnesota) | 4,178.12 mi (6,724.03 km) |
| Entroncamento to Owensboro (Kentucky) | 4,102.83 mi (6,602.87 km) |
| Entroncamento to Owings Mills (Maryland) | 3,551.52 mi (5,715.62 km) |
| Entroncamento to Owosso (Michigan) | 3,803.68 mi (6,121.43 km) |
