| Tigard to Siloam Springs (Arkansas) | 1,598.91 mi (2,573.19 km) |
| Tigard to Silver Firs (Washington) | 171.24 mi (275.58 km) |
| Tigard to Silver Spring (Maryland) | 2,350.85 mi (3,783.33 km) |
| Tigard to Silver Springs Shores (Florida) | 2,474.27 mi (3,981.96 km) |
| Tigard to Silverdale (Washington) | 155.02 mi (249.49 km) |
| Tigard to Silverton (Oregon) | 29.07 mi (46.78 km) |
| Tigard to Simi Valley (California) | 799.79 mi (1,287.14 km) |
| Tigard to Simpsonville (South Carolina) | 2,239.24 mi (3,603.72 km) |
| Tigard to Sioux City (Iowa) | 1,322.11 mi (2,127.73 km) |
| Tigard to Sioux Falls (South Dakota) | 1,285.24 mi (2,068.39 km) |
| Tigard to Skokie (Illinois) | 1,751.17 mi (2,818.24 km) |
| Tigard to Sleepy Hollow (New York) | 2,441.10 mi (3,928.57 km) |
| Tigard to Slidell (Louisiana) | 2,060.86 mi (3,316.63 km) |
| Tigard to Smithfield (North Carolina) | 2,400.54 mi (3,863.29 km) |
| Tigard to Smithfield (Utah) | 600.84 mi (966.96 km) |
