| Comacchio to Silver Firs (Washington) | 5,468.29 mi (8,800.37 km) |
| Comacchio to Silver Spring (Maryland) | 4,368.99 mi (7,031.20 km) |
| Comacchio to Silver Springs Shores (Florida) | 5,025.63 mi (8,087.98 km) |
| Comacchio to Silverdale (Washington) | 5,492.72 mi (8,839.68 km) |
| Comacchio to Silverton (Oregon) | 5,653.38 mi (9,098.23 km) |
| Comacchio to Simi Valley (California) | 6,174.15 mi (9,936.33 km) |
| Comacchio to Simpsonville (South Carolina) | 4,779.63 mi (7,692.07 km) |
| Comacchio to Sioux City (Iowa) | 4,977.97 mi (8,011.26 km) |
| Comacchio to Sioux Falls (South Dakota) | 4,939.30 mi (7,949.03 km) |
| Comacchio to Skokie (Illinois) | 4,675.23 mi (7,524.06 km) |
| Comacchio to Sleepy Hollow (New York) | 4,149.32 mi (6,677.69 km) |
| Comacchio to Slidell (Louisiana) | 5,309.80 mi (8,545.29 km) |
| Comacchio to Smithfield (North Carolina) | 4,575.40 mi (7,363.40 km) |
| Comacchio to Smithfield (Utah) | 5,530.34 mi (8,900.22 km) |
| Comacchio to Smithville (Missouri) | 5,061.88 mi (8,146.31 km) |
