| Omagh to Cookeville (Tennessee) | 3,787.06 mi (6,094.69 km) |
| Omagh to Coolidge (Arizona) | 4,914.06 mi (7,908.42 km) |
| Omagh to Coon Rapids (Minnesota) | 3,639.03 mi (5,856.45 km) |
| Omagh to Cooper City (Florida) | 4,099.22 mi (6,597.06 km) |
| Omagh to Coos Bay (Oregon) | 4,722.44 mi (7,600.04 km) |
| Omagh to Copiague (New York) | 3,097.49 mi (4,984.93 km) |
| Omagh to Coppell (Texas) | 4,388.27 mi (7,062.23 km) |
| Omagh to Copperas Cove (Texas) | 4,520.71 mi (7,275.38 km) |
| Omagh to Coral Gables (Florida) | 4,116.76 mi (6,625.28 km) |
| Omagh to Coral Springs (Florida) | 4,086.31 mi (6,576.29 km) |
| Omagh to Coral Terrace (Florida) | 4,115.83 mi (6,623.79 km) |
| Omagh to Coralville (Iowa) | 3,744.22 mi (6,025.74 km) |
| Omagh to Coram (New York) | 3,072.70 mi (4,945.03 km) |
| Omagh to Corcoran (California) | 5,001.57 mi (8,049.24 km) |
| Omagh to Cordele (Georgia) | 3,930.44 mi (6,325.43 km) |
