| Oceanside to Odessa (Texas) | 875.63 mi (1,409.19 km) |
| Oceanside to Ogden (Utah) | 625.84 mi (1,007.20 km) |
| Oceanside to Oildale (California) | 181.26 mi (291.72 km) |
| Oceanside to Ojus (Florida) | 2,275.21 mi (3,661.59 km) |
| Oceanside to Okemos (Michigan) | 1,893.45 mi (3,047.21 km) |
| Oceanside to Oklahoma City (Oklahoma) | 1,137.85 mi (1,831.19 km) |
| Oceanside to Okmulgee (Oklahoma) | 1,222.84 mi (1,967.97 km) |
| Oceanside to Olathe (Kansas) | 1,311.66 mi (2,110.91 km) |
| Oceanside to Old Jamestown (Missouri) | 1,552.70 mi (2,498.83 km) |
| Oceanside to Oldsmar (Florida) | 2,080.34 mi (3,347.98 km) |
| Oceanside to Olean (New York) | 2,192.17 mi (3,527.96 km) |
| Oceanside to Olive Branch (Mississippi) | 1,570.94 mi (2,528.18 km) |
| Oceanside to Olivehurst (California) | 468.70 mi (754.30 km) |
| Oceanside to Olney (Maryland) | 2,261.95 mi (3,640.26 km) |
| Oceanside to Olympia (Washington) | 998.57 mi (1,607.05 km) |
