| Montemor-o-Novo to Orangevale (California) | 5,613.64 mi (9,034.28 km) |
| Montemor-o-Novo to Orchards (Washington) | 5,331.01 mi (8,579.42 km) |
| Montemor-o-Novo to Orcutt (California) | 5,762.52 mi (9,273.88 km) |
| Montemor-o-Novo to Oregon (Ohio) | 3,846.22 mi (6,189.90 km) |
| Montemor-o-Novo to Oregon (Wisconsin) | 4,085.39 mi (6,574.81 km) |
| Montemor-o-Novo to Oregon City (Oregon) | 5,349.60 mi (8,609.35 km) |
| Montemor-o-Novo to Orem (Utah) | 5,156.36 mi (8,298.36 km) |
| Montemor-o-Novo to Orinda (California) | 5,689.74 mi (9,156.75 km) |
| Montemor-o-Novo to Orland Park (Illinois) | 4,055.01 mi (6,525.91 km) |
| Montemor-o-Novo to Orlando (Florida) | 4,158.72 mi (6,692.81 km) |
| Montemor-o-Novo to Ormond Beach (Florida) | 4,117.78 mi (6,626.93 km) |
| Montemor-o-Novo to Oro Valley (Arizona) | 5,464.69 mi (8,794.57 km) |
| Montemor-o-Novo to Oroville (California) | 5,588.46 mi (8,993.76 km) |
| Montemor-o-Novo to Oshkosh (Wisconsin) | 4,015.35 mi (6,462.09 km) |
| Montemor-o-Novo to Oskaloosa (Iowa) | 4,285.15 mi (6,896.29 km) |
