| North Tustin to Olympia Heights (Florida) | 2,301.19 mi (3,703.40 km) |
| North Tustin to Omaha (Nebraska) | 1,294.73 mi (2,083.67 km) |
| North Tustin to On Top of the World Designated Place (Florida) | 2,107.43 mi (3,391.57 km) |
| North Tustin to Onalaska (Wisconsin) | 1,583.40 mi (2,548.23 km) |
| North Tustin to Oneida (New York) | 2,343.03 mi (3,770.74 km) |
| North Tustin to Oneonta (New York) | 2,372.57 mi (3,818.29 km) |
| North Tustin to Ontario (California) | 21.90 mi (35.24 km) |
| North Tustin to Ontario (Oregon) | 710.41 mi (1,143.30 km) |
| North Tustin to Opa-locka (Florida) | 2,301.27 mi (3,703.54 km) |
| North Tustin to Opelika (Alabama) | 1,867.79 mi (3,005.92 km) |
| North Tustin to Opelousas (Louisiana) | 1,516.80 mi (2,441.05 km) |
| North Tustin to Orange (California) | 3.18 mi (5.12 km) |
| North Tustin to Orange (Texas) | 1,428.02 mi (2,298.18 km) |
| North Tustin to Orange City (Florida) | 2,168.44 mi (3,489.76 km) |
| North Tustin to Orangeburg (South Carolina) | 2,112.95 mi (3,400.46 km) |
