| Omagh to Silver Firs (Washington) | 4,410.57 mi (7,098.12 km) |
| Omagh to Silver Spring (Maryland) | 3,317.52 mi (5,339.03 km) |
| Omagh to Silver Springs Shores (Florida) | 4,007.51 mi (6,449.46 km) |
| Omagh to Silverdale (Washington) | 4,436.08 mi (7,139.18 km) |
| Omagh to Silverton (Oregon) | 4,589.20 mi (7,385.61 km) |
| Omagh to Simi Valley (California) | 5,079.61 mi (8,174.85 km) |
| Omagh to Simpsonville (South Carolina) | 3,730.82 mi (6,004.17 km) |
| Omagh to Sioux City (Iowa) | 3,878.30 mi (6,241.52 km) |
| Omagh to Sioux Falls (South Dakota) | 3,838.87 mi (6,178.07 km) |
| Omagh to Skokie (Illinois) | 3,585.43 mi (5,770.18 km) |
| Omagh to Sleepy Hollow (New York) | 3,097.13 mi (4,984.35 km) |
| Omagh to Slidell (Louisiana) | 4,252.51 mi (6,843.75 km) |
| Omagh to Smithfield (North Carolina) | 3,537.95 mi (5,693.78 km) |
| Omagh to Smithfield (Utah) | 4,435.69 mi (7,138.55 km) |
| Omagh to Smithville (Missouri) | 3,967.48 mi (6,385.04 km) |
