| Omagh to Odessa (Texas) | 4,644.86 mi (7,475.17 km) |
| Omagh to Ogden (Utah) | 4,473.10 mi (7,198.77 km) |
| Omagh to Oildale (California) | 5,022.20 mi (8,082.44 km) |
| Omagh to Ojus (Florida) | 4,098.96 mi (6,596.63 km) |
| Omagh to Okemos (Michigan) | 3,429.39 mi (5,519.08 km) |
| Omagh to Oklahoma City (Oklahoma) | 4,276.61 mi (6,882.54 km) |
| Omagh to Okmulgee (Oklahoma) | 4,213.15 mi (6,780.41 km) |
| Omagh to Olathe (Kansas) | 4,002.09 mi (6,440.73 km) |
| Omagh to Old Jamestown (Missouri) | 3,835.77 mi (6,173.08 km) |
| Omagh to Oldsmar (Florida) | 4,088.95 mi (6,580.54 km) |
| Omagh to Olean (New York) | 3,229.89 mi (5,198.01 km) |
| Omagh to Olive Branch (Mississippi) | 4,013.85 mi (6,459.66 km) |
| Omagh to Olivehurst (California) | 4,891.52 mi (7,872.14 km) |
| Omagh to Olney (Maryland) | 3,312.75 mi (5,331.35 km) |
| Omagh to Olympia (Washington) | 4,477.03 mi (7,205.09 km) |
