| Portogruaro to Oakley (California) | 5,997.50 mi (9,652.05 km) |
| Portogruaro to Oakton (Virginia) | 4,376.45 mi (7,043.21 km) |
| Portogruaro to Oakville (Missouri) | 4,923.20 mi (7,923.12 km) |
| Portogruaro to Oatfield (Oregon) | 5,575.51 mi (8,972.91 km) |
| Portogruaro to Ocala (Florida) | 5,026.67 mi (8,089.64 km) |
| Portogruaro to Ocean Acres (New Jersey) | 4,212.82 mi (6,779.88 km) |
| Portogruaro to Ocean City (New Jersey) | 4,246.35 mi (6,833.84 km) |
| Portogruaro to Ocean Pines (Maryland) | 4,307.01 mi (6,931.46 km) |
| Portogruaro to Ocean Pointe (Hawaii) | 7,765.42 mi (12,497.24 km) |
| Portogruaro to Ocean Springs (Mississippi) | 5,252.28 mi (8,452.73 km) |
| Portogruaro to Oceanside (California) | 6,152.63 mi (9,901.70 km) |
| Portogruaro to Oceanside (New York) | 4,148.73 mi (6,676.74 km) |
| Portogruaro to Ocoee (Florida) | 5,027.82 mi (8,091.50 km) |
| Portogruaro to Oconomowoc (Wisconsin) | 4,633.76 mi (7,457.31 km) |
| Portogruaro to Odenton (Maryland) | 4,343.28 mi (6,989.83 km) |
