| National City to Somersworth (New Hampshire) | 2,586.02 mi (4,161.80 km) |
| National City to Somerton (Arizona) | 139.65 mi (224.75 km) |
| National City to Somerville (Massachusetts) | 2,575.00 mi (4,144.07 km) |
| National City to Somerville (New Jersey) | 2,394.52 mi (3,853.61 km) |
| National City to Sonoma (California) | 491.77 mi (791.42 km) |
| National City to Soquel (California) | 406.40 mi (654.04 km) |
| National City to South Bend (Indiana) | 1,796.25 mi (2,890.78 km) |
| National City to South Bradenton (Florida) | 2,085.76 mi (3,356.70 km) |
| National City to South Burlington (Vermont) | 2,473.05 mi (3,979.98 km) |
| National City to South Charleston (West Virginia) | 2,015.71 mi (3,243.98 km) |
| National City to South Daytona (Florida) | 2,142.85 mi (3,448.59 km) |
| National City to South El Monte (California) | 110.22 mi (177.39 km) |
| National City to South Elgin (Illinois) | 1,697.47 mi (2,731.82 km) |
| National City to South Euclid (Ohio) | 2,037.55 mi (3,279.12 km) |
| National City to South Farmingdale (New York) | 2,455.27 mi (3,951.37 km) |
