| Garden Grove to Orbetello | 6,267.02 mi (10,085.79 km) |
| Garden Grove to Oria | 6,576.92 mi (10,584.54 km) |
| Garden Grove to Oristano | 6,309.63 mi (10,154.38 km) |
| Garden Grove to Orta Nova | 6,471.19 mi (10,414.37 km) |
| Garden Grove to Orte | 6,304.14 mi (10,145.54 km) |
| Garden Grove to Ortona | 6,374.23 mi (10,258.33 km) |
| Garden Grove to Orvieto | 6,281.46 mi (10,109.04 km) |
| Garden Grove to Orzinuovi | 6,070.23 mi (9,769.09 km) |
| Garden Grove to Osimo | 6,284.02 mi (10,113.15 km) |
| Garden Grove to Ospitaletto | 6,066.58 mi (9,763.21 km) |
| Garden Grove to Ostuni | 6,562.31 mi (10,561.02 km) |
| Garden Grove to Ottaviano | 6,458.45 mi (10,393.87 km) |
| Garden Grove to Ovada | 6,068.01 mi (9,765.52 km) |
| Garden Grove to Ozieri | 6,289.10 mi (10,121.33 km) |
| Garden Grove to Paceco | 6,548.91 mi (10,539.46 km) |
