Wanblee, SD has a population of 859 and is the 16,115th largest city in the United States. The population density is 401 per sq mi which is 3610% higher than the South Dakota average and 343% higher than the national average. The median age in Wanblee is 22 which is approximately 41% lower than the South Dakota average of 37. In Wanblee, 30% of the population over 15 years of age are married, 66% speak English and 9% speak Spanish. 85% of Wanblee residents were born in South Dakota, 8% were born out of state, 0% were born outside of the United States and 7% were foreign born.