| Tamalpais-Homestead Valley to Orbetello | 6,172.79 mi (9,934.14 km) |
| Tamalpais-Homestead Valley to Oria | 6,464.66 mi (10,403.86 km) |
| Tamalpais-Homestead Valley to Oristano | 6,235.68 mi (10,035.35 km) |
| Tamalpais-Homestead Valley to Orta Nova | 6,363.69 mi (10,241.38 km) |
| Tamalpais-Homestead Valley to Orte | 6,205.37 mi (9,986.58 km) |
| Tamalpais-Homestead Valley to Ortona | 6,268.15 mi (10,087.61 km) |
| Tamalpais-Homestead Valley to Orvieto | 6,182.75 mi (9,950.17 km) |
| Tamalpais-Homestead Valley to Orzinuovi | 5,968.97 mi (9,606.12 km) |
| Tamalpais-Homestead Valley to Osimo | 6,177.21 mi (9,941.26 km) |
| Tamalpais-Homestead Valley to Ospitaletto | 5,964.20 mi (9,598.45 km) |
| Tamalpais-Homestead Valley to Ostuni | 6,449.43 mi (10,379.36 km) |
| Tamalpais-Homestead Valley to Ottaviano | 6,357.62 mi (10,231.60 km) |
| Tamalpais-Homestead Valley to Ovada | 5,974.40 mi (9,614.86 km) |
| Tamalpais-Homestead Valley to Ozieri | 6,210.75 mi (9,995.24 km) |
| Tamalpais-Homestead Valley to Paceco | 6,466.81 mi (10,407.33 km) |
