| National City to Security-Widefield (Colorado) | 810.94 mi (1,305.09 km) |
| National City to Sedalia (Missouri) | 1,398.09 mi (2,250.00 km) |
| National City to Sedro-Woolley (Washington) | 1,126.82 mi (1,813.44 km) |
| National City to Seguin (Texas) | 1,149.61 mi (1,850.12 km) |
| National City to Selden (New York) | 2,476.01 mi (3,984.75 km) |
| National City to Selma (Alabama) | 1,745.31 mi (2,808.81 km) |
| National City to Selma (California) | 305.42 mi (491.53 km) |
| National City to Selma (Texas) | 1,129.65 mi (1,818.00 km) |
| National City to Seminole (Florida) | 2,065.80 mi (3,324.58 km) |
| National City to Seven Hills (Ohio) | 2,028.87 mi (3,265.16 km) |
| National City to Seven Oaks (South Carolina) | 2,066.52 mi (3,325.75 km) |
| National City to Severn (Maryland) | 2,285.66 mi (3,678.42 km) |
| National City to Severna Park (Maryland) | 2,292.56 mi (3,689.51 km) |
| National City to Sevierville (Tennessee) | 1,917.88 mi (3,086.54 km) |
| National City to Seymour (Indiana) | 1,792.24 mi (2,884.33 km) |
