| Willimantic to Orangeburg (South Carolina) | 739.02 mi (1,189.34 km) |
| Willimantic to Orangevale (California) | 2,559.74 mi (4,119.50 km) |
| Willimantic to Orchards (Washington) | 2,486.75 mi (4,002.04 km) |
| Willimantic to Orcutt (California) | 2,622.04 mi (4,219.76 km) |
| Willimantic to Oregon (Ohio) | 578.59 mi (931.16 km) |
| Willimantic to Oregon (Wisconsin) | 879.97 mi (1,416.17 km) |
| Willimantic to Oregon City (Oregon) | 2,494.83 mi (4,015.04 km) |
| Willimantic to Orem (Utah) | 2,043.08 mi (3,288.02 km) |
| Willimantic to Orinda (California) | 2,628.44 mi (4,230.07 km) |
| Willimantic to Orland Park (Illinois) | 806.77 mi (1,298.37 km) |
| Willimantic to Orlando (Florida) | 1,048.72 mi (1,687.76 km) |
| Willimantic to Ormond Beach (Florida) | 991.77 mi (1,596.09 km) |
| Willimantic to Oro Valley (Arizona) | 2,210.84 mi (3,558.01 km) |
| Willimantic to Oroville (California) | 2,557.52 mi (4,115.93 km) |
| Willimantic to Oshkosh (Wisconsin) | 841.67 mi (1,354.54 km) |
