| Foster City to Orangevale (California) | 96.71 mi (155.63 km) |
| Foster City to Orchards (Washington) | 562.15 mi (904.69 km) |
| Foster City to Orcutt (California) | 212.14 mi (341.41 km) |
| Foster City to Oregon (Ohio) | 2,068.90 mi (3,329.58 km) |
| Foster City to Oregon (Wisconsin) | 1,761.38 mi (2,834.67 km) |
| Foster City to Oregon City (Oregon) | 538.26 mi (866.24 km) |
| Foster City to Orem (Utah) | 598.29 mi (962.85 km) |
| Foster City to Orinda (California) | 22.99 mi (36.99 km) |
| Foster City to Orland Park (Illinois) | 1,840.91 mi (2,962.66 km) |
| Foster City to Orlando (Florida) | 2,432.31 mi (3,914.43 km) |
| Foster City to Ormond Beach (Florida) | 2,421.06 mi (3,896.32 km) |
| Foster City to Oro Valley (Arizona) | 730.15 mi (1,175.06 km) |
| Foster City to Oroville (California) | 139.62 mi (224.70 km) |
| Foster City to Oshkosh (Wisconsin) | 1,805.21 mi (2,905.20 km) |
| Foster City to Oskaloosa (Iowa) | 1,594.17 mi (2,565.58 km) |
