| Wallingford Center to Olympia (Washington) | 2,465.45 mi (3,967.76 km) |
| Wallingford Center to Olympia Heights (Florida) | 1,168.38 mi (1,880.33 km) |
| Wallingford Center to Omaha (Nebraska) | 1,201.41 mi (1,933.48 km) |
| Wallingford Center to On Top of the World Designated Place (Florida) | 1,004.80 mi (1,617.07 km) |
| Wallingford Center to Onalaska (Wisconsin) | 947.20 mi (1,524.37 km) |
| Wallingford Center to Oneida (New York) | 183.76 mi (295.73 km) |
| Wallingford Center to Oneonta (New York) | 134.76 mi (216.88 km) |
| Wallingford Center to Ontario (California) | 2,471.56 mi (3,977.60 km) |
| Wallingford Center to Ontario (Oregon) | 2,221.01 mi (3,574.36 km) |
| Wallingford Center to Opa-locka (Florida) | 1,155.20 mi (1,859.11 km) |
| Wallingford Center to Opelika (Alabama) | 919.22 mi (1,479.35 km) |
| Wallingford Center to Opelousas (Louisiana) | 1,310.19 mi (2,108.55 km) |
| Wallingford Center to Orange (California) | 2,489.72 mi (4,006.83 km) |
| Wallingford Center to Orange (Texas) | 1,404.79 mi (2,260.79 km) |
| Wallingford Center to Orange City (Florida) | 986.91 mi (1,588.28 km) |
