| Portogruaro to Oswego (Illinois) | 4,693.58 mi (7,553.59 km) |
| Portogruaro to Oswego (New York) | 4,151.10 mi (6,680.55 km) |
| Portogruaro to Otsego (Minnesota) | 4,717.49 mi (7,592.07 km) |
| Portogruaro to Ottawa (Illinois) | 4,727.53 mi (7,608.23 km) |
| Portogruaro to Ottawa (Kansas) | 5,103.83 mi (8,213.82 km) |
| Portogruaro to Ottumwa (Iowa) | 4,878.78 mi (7,851.63 km) |
| Portogruaro to Overland (Missouri) | 4,913.12 mi (7,906.91 km) |
| Portogruaro to Overland Park (Kansas) | 5,067.99 mi (8,156.15 km) |
| Portogruaro to Overlea (Maryland) | 4,323.10 mi (6,957.36 km) |
| Portogruaro to Oviedo (Florida) | 5,008.82 mi (8,060.91 km) |
| Portogruaro to Owasso (Oklahoma) | 5,241.45 mi (8,435.30 km) |
| Portogruaro to Owatonna (Minnesota) | 4,760.16 mi (7,660.73 km) |
| Portogruaro to Owensboro (Kentucky) | 4,829.95 mi (7,773.05 km) |
| Portogruaro to Owings Mills (Maryland) | 4,332.56 mi (6,972.58 km) |
| Portogruaro to Owosso (Michigan) | 4,474.05 mi (7,200.29 km) |
