| Placentia to Silver Firs (Washington) | 991.41 mi (1,595.53 km) |
| Placentia to Silver Spring (Maryland) | 2,277.87 mi (3,665.87 km) |
| Placentia to Silver Springs Shores (Florida) | 2,126.21 mi (3,421.80 km) |
| Placentia to Silverdale (Washington) | 984.90 mi (1,585.05 km) |
| Placentia to Silverton (Oregon) | 811.76 mi (1,306.40 km) |
| Placentia to Simi Valley (California) | 57.67 mi (92.81 km) |
| Placentia to Simpsonville (South Carolina) | 2,021.93 mi (3,253.98 km) |
| Placentia to Sioux City (Iowa) | 1,303.73 mi (2,098.16 km) |
| Placentia to Sioux Falls (South Dakota) | 1,314.42 mi (2,115.35 km) |
| Placentia to Skokie (Illinois) | 1,724.07 mi (2,774.62 km) |
| Placentia to Sleepy Hollow (New York) | 2,435.73 mi (3,919.92 km) |
| Placentia to Slidell (Louisiana) | 1,656.76 mi (2,666.30 km) |
| Placentia to Smithfield (North Carolina) | 2,232.01 mi (3,592.07 km) |
| Placentia to Smithfield (Utah) | 640.06 mi (1,030.08 km) |
| Placentia to Smithville (Missouri) | 1,341.41 mi (2,158.79 km) |
