| Castro Valley to Orthez | 5,730.97 mi (9,223.10 km) |
| Castro Valley to Orvault | 5,512.61 mi (8,871.69 km) |
| Castro Valley to Osny | 5,537.29 mi (8,911.41 km) |
| Castro Valley to Ostwald | 5,728.61 mi (9,219.31 km) |
| Castro Valley to Ouistreham | 5,455.32 mi (8,779.49 km) |
| Castro Valley to Oullins | 5,796.29 mi (9,328.23 km) |
| Castro Valley to Outreau | 5,438.80 mi (8,752.90 km) |
| Castro Valley to Oyonnax | 5,793.10 mi (9,323.09 km) |
| Castro Valley to Ozoir-la-Ferriere | 5,570.41 mi (8,964.72 km) |
| Castro Valley to Pace | 5,464.16 mi (8,793.72 km) |
| Castro Valley to Palaiseau | 5,560.63 mi (8,948.98 km) |
| Castro Valley to Pamiers | 5,830.40 mi (9,383.13 km) |
| Castro Valley to Panazol | 5,679.92 mi (9,140.95 km) |
| Castro Valley to Pantin | 5,555.90 mi (8,941.36 km) |
| Castro Valley to Paray-le-Monial | 5,736.09 mi (9,231.34 km) |
