| Barcelos to Oswego (Illinois) | 3,957.42 mi (6,368.85 km) |
| Barcelos to Oswego (New York) | 3,362.18 mi (5,410.90 km) |
| Barcelos to Otsego (Minnesota) | 4,068.51 mi (6,547.64 km) |
| Barcelos to Ottawa (Illinois) | 3,990.53 mi (6,422.14 km) |
| Barcelos to Ottawa (Kansas) | 4,380.54 mi (7,049.79 km) |
| Barcelos to Ottumwa (Iowa) | 4,163.75 mi (6,700.90 km) |
| Barcelos to Overland (Missouri) | 4,153.65 mi (6,684.66 km) |
| Barcelos to Overland Park (Kansas) | 4,343.66 mi (6,990.45 km) |
| Barcelos to Overlea (Maryland) | 3,478.37 mi (5,597.90 km) |
| Barcelos to Oviedo (Florida) | 4,078.12 mi (6,563.10 km) |
| Barcelos to Owasso (Oklahoma) | 4,495.39 mi (7,234.64 km) |
| Barcelos to Owatonna (Minnesota) | 4,092.00 mi (6,585.44 km) |
| Barcelos to Owensboro (Kentucky) | 4,035.51 mi (6,494.53 km) |
| Barcelos to Owings Mills (Maryland) | 3,490.12 mi (5,616.81 km) |
| Barcelos to Owosso (Michigan) | 3,727.11 mi (5,998.20 km) |
