| Mentor to Oakley (California) | 2,136.60 mi (3,438.53 km) |
| Mentor to Oakton (Virginia) | 287.44 mi (462.59 km) |
| Mentor to Oakville (Missouri) | 524.80 mi (844.59 km) |
| Mentor to Oatfield (Oregon) | 2,059.10 mi (3,313.80 km) |
| Mentor to Ocala (Florida) | 865.65 mi (1,393.13 km) |
| Mentor to Ocean Acres (New Jersey) | 393.06 mi (632.58 km) |
| Mentor to Ocean City (New Jersey) | 391.31 mi (629.76 km) |
| Mentor to Ocean Pines (Maryland) | 398.90 mi (641.97 km) |
| Mentor to Ocean Pointe (Hawaii) | 4,581.18 mi (7,372.70 km) |
| Mentor to Ocean Springs (Mississippi) | 882.73 mi (1,420.61 km) |
| Mentor to Oceanside (California) | 2,041.26 mi (3,285.10 km) |
| Mentor to Oceanside (New York) | 406.98 mi (654.97 km) |
| Mentor to Ocoee (Florida) | 905.86 mi (1,457.84 km) |
| Mentor to Oconomowoc (Wisconsin) | 377.92 mi (608.20 km) |
| Mentor to Odenton (Maryland) | 304.16 mi (489.49 km) |
