Pierre, SD has a population of 13,885 and is the 3,002nd largest city in the United States. The population density is 1,063 per sq mi which is 9837% higher than the South Dakota average and 1074% higher than the national average. The median age in Pierre is 39 which is approximately 5% higher than the South Dakota average of 37. In Pierre, 62% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 70% of Pierre residents were born in South Dakota, 29% were born out of state, 0% were born outside of the United States and 2% were foreign born.