| Mentor to Orangevale (California) | 2,096.55 mi (3,374.07 km) |
| Mentor to Orchards (Washington) | 2,053.56 mi (3,304.89 km) |
| Mentor to Orcutt (California) | 2,152.35 mi (3,463.87 km) |
| Mentor to Oregon (Ohio) | 108.20 mi (174.13 km) |
| Mentor to Oregon (Wisconsin) | 420.08 mi (676.05 km) |
| Mentor to Oregon City (Oregon) | 2,059.69 mi (3,314.75 km) |
| Mentor to Orem (Utah) | 1,578.16 mi (2,539.81 km) |
| Mentor to Orinda (California) | 2,164.03 mi (3,482.67 km) |
| Mentor to Orland Park (Illinois) | 336.88 mi (542.16 km) |
| Mentor to Orlando (Florida) | 912.86 mi (1,469.11 km) |
| Mentor to Ormond Beach (Florida) | 856.22 mi (1,377.96 km) |
| Mentor to Oro Valley (Arizona) | 1,744.58 mi (2,807.63 km) |
| Mentor to Oroville (California) | 2,096.73 mi (3,374.35 km) |
| Mentor to Oshkosh (Wisconsin) | 399.73 mi (643.31 km) |
| Mentor to Oskaloosa (Iowa) | 585.27 mi (941.91 km) |
