| Omagh to Oswego (Illinois) | 3,624.48 mi (5,833.04 km) |
| Omagh to Oswego (New York) | 3,093.94 mi (4,979.22 km) |
| Omagh to Otsego (Minnesota) | 3,645.72 mi (5,867.22 km) |
| Omagh to Ottawa (Illinois) | 3,658.41 mi (5,887.65 km) |
| Omagh to Ottawa (Kansas) | 4,032.72 mi (6,490.04 km) |
| Omagh to Ottumwa (Iowa) | 3,807.56 mi (6,127.67 km) |
| Omagh to Overland (Missouri) | 3,846.01 mi (6,189.55 km) |
| Omagh to Overland Park (Kansas) | 3,997.01 mi (6,432.57 km) |
| Omagh to Overlea (Maryland) | 3,280.78 mi (5,279.90 km) |
| Omagh to Oviedo (Florida) | 3,998.19 mi (6,434.46 km) |
| Omagh to Owasso (Oklahoma) | 4,171.80 mi (6,713.86 km) |
| Omagh to Owatonna (Minnesota) | 3,687.96 mi (5,935.20 km) |
| Omagh to Owensboro (Kentucky) | 3,769.17 mi (6,065.89 km) |
| Omagh to Owings Mills (Maryland) | 3,289.31 mi (5,293.63 km) |
| Omagh to Owosso (Michigan) | 3,407.05 mi (5,483.12 km) |
