| Martinez to Olympia Heights (Florida) | 2,569.59 mi (4,135.36 km) |
| Martinez to Omaha (Nebraska) | 1,399.71 mi (2,252.62 km) |
| Martinez to On Top of the World Designated Place (Florida) | 2,355.01 mi (3,790.03 km) |
| Martinez to Onalaska (Wisconsin) | 1,653.14 mi (2,660.47 km) |
| Martinez to Oneida (New York) | 2,432.90 mi (3,915.38 km) |
| Martinez to Oneonta (New York) | 2,469.10 mi (3,973.63 km) |
| Martinez to Ontario (California) | 371.85 mi (598.43 km) |
| Martinez to Ontario (Oregon) | 494.99 mi (796.60 km) |
| Martinez to Opa-locka (Florida) | 2,568.12 mi (4,132.99 km) |
| Martinez to Opelika (Alabama) | 2,089.67 mi (3,363.00 km) |
| Martinez to Opelousas (Louisiana) | 1,782.25 mi (2,868.26 km) |
| Martinez to Orange (California) | 376.41 mi (605.78 km) |
| Martinez to Orange (Texas) | 1,703.96 mi (2,742.26 km) |
| Martinez to Orange City (Florida) | 2,414.46 mi (3,885.70 km) |
| Martinez to Orangeburg (South Carolina) | 2,315.02 mi (3,725.66 km) |
