| Montemor-o-Novo to Oswego (Illinois) | 4,074.76 mi (6,557.70 km) |
| Montemor-o-Novo to Oswego (New York) | 3,472.58 mi (5,588.57 km) |
| Montemor-o-Novo to Otsego (Minnesota) | 4,201.47 mi (6,761.62 km) |
| Montemor-o-Novo to Ottawa (Illinois) | 4,107.48 mi (6,610.35 km) |
| Montemor-o-Novo to Ottawa (Kansas) | 4,497.73 mi (7,238.39 km) |
| Montemor-o-Novo to Ottumwa (Iowa) | 4,283.94 mi (6,894.34 km) |
| Montemor-o-Novo to Overland (Missouri) | 4,264.80 mi (6,863.54 km) |
| Montemor-o-Novo to Overland Park (Kansas) | 4,460.88 mi (7,179.09 km) |
| Montemor-o-Novo to Overlea (Maryland) | 3,574.19 mi (5,752.10 km) |
| Montemor-o-Novo to Oviedo (Florida) | 4,144.55 mi (6,670.01 km) |
| Montemor-o-Novo to Owasso (Oklahoma) | 4,607.23 mi (7,414.63 km) |
| Montemor-o-Novo to Owatonna (Minnesota) | 4,221.44 mi (6,793.75 km) |
| Montemor-o-Novo to Owensboro (Kentucky) | 4,139.66 mi (6,662.14 km) |
| Montemor-o-Novo to Owings Mills (Maryland) | 3,586.45 mi (5,771.83 km) |
| Montemor-o-Novo to Owosso (Michigan) | 3,843.85 mi (6,186.07 km) |
