| Mentor to Oswego (Illinois) | 361.14 mi (581.20 km) |
| Mentor to Oswego (New York) | 274.48 mi (441.73 km) |
| Mentor to Otsego (Minnesota) | 662.75 mi (1,066.59 km) |
| Mentor to Ottawa (Illinois) | 388.01 mi (624.45 km) |
| Mentor to Ottawa (Kansas) | 764.95 mi (1,231.07 km) |
| Mentor to Ottumwa (Iowa) | 576.24 mi (927.36 km) |
| Mentor to Overland (Missouri) | 519.30 mi (835.73 km) |
| Mentor to Overland Park (Kansas) | 728.94 mi (1,173.12 km) |
| Mentor to Overlea (Maryland) | 299.68 mi (482.29 km) |
| Mentor to Oviedo (Florida) | 900.41 mi (1,449.08 km) |
| Mentor to Owasso (Oklahoma) | 861.76 mi (1,386.87 km) |
| Mentor to Owatonna (Minnesota) | 623.96 mi (1,004.17 km) |
| Mentor to Owensboro (Kentucky) | 409.92 mi (659.70 km) |
| Mentor to Owings Mills (Maryland) | 285.77 mi (459.90 km) |
| Mentor to Owosso (Michigan) | 170.80 mi (274.88 km) |
