| Santa Monica to Olympia (Washington) | 928.46 mi (1,494.22 km) |
| Santa Monica to Olympia Heights (Florida) | 2,341.65 mi (3,768.52 km) |
| Santa Monica to Omaha (Nebraska) | 1,320.23 mi (2,124.70 km) |
| Santa Monica to On Top of the World Designated Place (Florida) | 2,146.47 mi (3,454.41 km) |
| Santa Monica to Onalaska (Wisconsin) | 1,606.22 mi (2,584.97 km) |
| Santa Monica to Oneida (New York) | 2,369.12 mi (3,812.73 km) |
| Santa Monica to Oneonta (New York) | 2,399.33 mi (3,861.35 km) |
| Santa Monica to Ontario (California) | 50.09 mi (80.61 km) |
| Santa Monica to Ontario (Oregon) | 695.77 mi (1,119.73 km) |
| Santa Monica to Opa-locka (Florida) | 2,341.64 mi (3,768.51 km) |
| Santa Monica to Opelika (Alabama) | 1,904.80 mi (3,065.48 km) |
| Santa Monica to Opelousas (Louisiana) | 1,556.62 mi (2,505.13 km) |
| Santa Monica to Orange (California) | 40.73 mi (65.55 km) |
| Santa Monica to Orange (Texas) | 1,468.45 mi (2,363.24 km) |
| Santa Monica to Orange City (Florida) | 2,207.41 mi (3,552.49 km) |
