Salem, SD has a population of 1,367 and is the 13,237th largest city in the United States. The population density is 1,093 per sq mi which is 10013% higher than the South Dakota average and 1107% higher than the national average. The median age in Salem is 45 which is approximately 22% higher than the South Dakota average of 37. In Salem, 67% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 79% of Salem residents were born in South Dakota, 18% were born out of state, 1% were born outside of the United States and 2% were foreign born.