| Castelo Branco to Silver Firs (Washington) | 5,177.50 mi (8,332.38 km) |
| Castelo Branco to Silver Spring (Maryland) | 3,612.03 mi (5,813.01 km) |
| Castelo Branco to Silver Springs Shores (Florida) | 4,187.96 mi (6,739.87 km) |
| Castelo Branco to Silverdale (Washington) | 5,204.79 mi (8,376.30 km) |
| Castelo Branco to Silverton (Oregon) | 5,336.74 mi (8,588.65 km) |
| Castelo Branco to Simi Valley (California) | 5,700.40 mi (9,173.90 km) |
| Castelo Branco to Simpsonville (South Carolina) | 4,003.48 mi (6,442.97 km) |
| Castelo Branco to Sioux City (Iowa) | 4,399.18 mi (7,079.79 km) |
| Castelo Branco to Sioux Falls (South Dakota) | 4,376.93 mi (7,043.98 km) |
| Castelo Branco to Skokie (Illinois) | 4,028.12 mi (6,482.64 km) |
| Castelo Branco to Sleepy Hollow (New York) | 3,402.16 mi (5,475.24 km) |
| Castelo Branco to Slidell (Louisiana) | 4,537.23 mi (7,301.97 km) |
| Castelo Branco to Smithfield (North Carolina) | 3,783.24 mi (6,088.53 km) |
| Castelo Branco to Smithfield (Utah) | 5,072.30 mi (8,163.07 km) |
| Castelo Branco to Smithville (Missouri) | 4,429.49 mi (7,128.58 km) |
