| Williamsport to Oakleaf Plantation (Florida) | 810.53 mi (1,304.42 km) |
| Williamsport to Oakley (California) | 2,361.33 mi (3,800.19 km) |
| Williamsport to Oakton (Virginia) | 163.05 mi (262.41 km) |
| Williamsport to Oakville (Missouri) | 729.74 mi (1,174.41 km) |
| Williamsport to Oatfield (Oregon) | 2,277.01 mi (3,664.49 km) |
| Williamsport to Ocala (Florida) | 881.54 mi (1,418.70 km) |
| Williamsport to Ocean Acres (New Jersey) | 177.96 mi (286.40 km) |
| Williamsport to Ocean City (New Jersey) | 187.19 mi (301.26 km) |
| Williamsport to Ocean Pines (Maryland) | 221.23 mi (356.04 km) |
| Williamsport to Ocean Pointe (Hawaii) | 4,805.82 mi (7,734.22 km) |
| Williamsport to Ocean Springs (Mississippi) | 994.74 mi (1,600.88 km) |
| Williamsport to Oceanside (California) | 2,262.03 mi (3,640.38 km) |
| Williamsport to Oceanside (New York) | 182.37 mi (293.50 km) |
| Williamsport to Ocoee (Florida) | 910.72 mi (1,465.66 km) |
| Williamsport to Oconomowoc (Wisconsin) | 600.13 mi (965.82 km) |
