| Idanha-a-Nova to Oswego (Illinois) | 4,075.29 mi (6,558.54 km) |
| Idanha-a-Nova to Oswego (New York) | 3,477.21 mi (5,596.02 km) |
| Idanha-a-Nova to Otsego (Minnesota) | 4,191.83 mi (6,746.10 km) |
| Idanha-a-Nova to Ottawa (Illinois) | 4,108.26 mi (6,611.61 km) |
| Idanha-a-Nova to Ottawa (Kansas) | 4,498.45 mi (7,239.56 km) |
| Idanha-a-Nova to Ottumwa (Iowa) | 4,282.71 mi (6,892.36 km) |
| Idanha-a-Nova to Overland (Missouri) | 4,269.22 mi (6,870.65 km) |
| Idanha-a-Nova to Overland Park (Kansas) | 4,461.58 mi (7,180.22 km) |
| Idanha-a-Nova to Overlea (Maryland) | 3,587.46 mi (5,773.46 km) |
| Idanha-a-Nova to Oviedo (Florida) | 4,174.04 mi (6,717.47 km) |
| Idanha-a-Nova to Owasso (Oklahoma) | 4,611.32 mi (7,421.20 km) |
| Idanha-a-Nova to Owatonna (Minnesota) | 4,214.17 mi (6,782.05 km) |
| Idanha-a-Nova to Owensboro (Kentucky) | 4,148.26 mi (6,675.99 km) |
| Idanha-a-Nova to Owings Mills (Maryland) | 3,599.43 mi (5,792.73 km) |
| Idanha-a-Nova to Owosso (Michigan) | 3,844.68 mi (6,187.42 km) |
