| Olesa de Montserrat to Oswego (Illinois) | 4,420.16 mi (7,113.55 km) |
| Olesa de Montserrat to Oswego (New York) | 3,839.44 mi (6,178.98 km) |
| Olesa de Montserrat to Otsego (Minnesota) | 4,500.27 mi (7,242.48 km) |
| Olesa de Montserrat to Ottawa (Illinois) | 4,453.77 mi (7,167.66 km) |
| Olesa de Montserrat to Ottawa (Kansas) | 4,841.36 mi (7,791.42 km) |
| Olesa de Montserrat to Ottumwa (Iowa) | 4,620.32 mi (7,435.69 km) |
| Olesa de Montserrat to Overland (Missouri) | 4,625.66 mi (7,444.27 km) |
| Olesa de Montserrat to Overland Park (Kansas) | 4,804.63 mi (7,732.30 km) |
| Olesa de Montserrat to Overlea (Maryland) | 3,974.87 mi (6,396.94 km) |
| Olesa de Montserrat to Oviedo (Florida) | 4,601.51 mi (7,405.42 km) |
| Olesa de Montserrat to Owasso (Oklahoma) | 4,964.72 mi (7,989.95 km) |
| Olesa de Montserrat to Owatonna (Minnesota) | 4,531.07 mi (7,292.06 km) |
| Olesa de Montserrat to Owensboro (Kentucky) | 4,518.60 mi (7,271.99 km) |
| Olesa de Montserrat to Owings Mills (Maryland) | 3,985.96 mi (6,414.78 km) |
| Olesa de Montserrat to Owosso (Michigan) | 4,192.14 mi (6,746.60 km) |
