| Oceanside to Orangevale (California) | 436.21 mi (702.01 km) |
| Oceanside to Orchards (Washington) | 904.61 mi (1,455.84 km) |
| Oceanside to Orcutt (California) | 211.38 mi (340.18 km) |
| Oceanside to Oregon (Ohio) | 1,933.36 mi (3,111.44 km) |
| Oceanside to Oregon (Wisconsin) | 1,649.83 mi (2,655.14 km) |
| Oceanside to Oregon City (Oregon) | 883.10 mi (1,421.21 km) |
| Oceanside to Orem (Utah) | 578.69 mi (931.32 km) |
| Oceanside to Orinda (California) | 422.30 mi (679.63 km) |
| Oceanside to Orland Park (Illinois) | 1,706.55 mi (2,746.43 km) |
| Oceanside to Orlando (Florida) | 2,148.14 mi (3,457.10 km) |
| Oceanside to Ormond Beach (Florida) | 2,144.91 mi (3,451.90 km) |
| Oceanside to Oro Valley (Arizona) | 371.74 mi (598.26 km) |
| Oceanside to Oroville (California) | 493.84 mi (794.77 km) |
| Oceanside to Oshkosh (Wisconsin) | 1,709.89 mi (2,751.80 km) |
| Oceanside to Oskaloosa (Iowa) | 1,460.16 mi (2,349.90 km) |
