| National City to San Luis Obispo (California) | 272.31 mi (438.25 km) |
| National City to San Marcos (California) | 32.74 mi (52.70 km) |
| National City to San Marcos (Texas) | 1,146.36 mi (1,844.89 km) |
| National City to San Marino (California) | 116.45 mi (187.41 km) |
| National City to San Mateo (California) | 448.00 mi (720.98 km) |
| National City to San Pablo (California) | 470.34 mi (756.94 km) |
| National City to San Rafael (California) | 478.18 mi (769.56 km) |
| National City to San Ramon (California) | 445.51 mi (716.97 km) |
| National City to San Tan Valley (Arizona) | 322.95 mi (519.74 km) |
| National City to Sand Springs (Oklahoma) | 1,216.75 mi (1,958.18 km) |
| National City to Sandusky (Ohio) | 1,976.36 mi (3,180.65 km) |
| National City to Sandy (Oregon) | 922.01 mi (1,483.83 km) |
| National City to Sandy (Utah) | 618.60 mi (995.54 km) |
| National City to Sandy Springs (Georgia) | 1,884.02 mi (3,032.04 km) |
| National City to Sanford (Florida) | 2,134.34 mi (3,434.89 km) |
