Waubay, SD has a population of 557 and is the 18,900th largest city in the United States. The population density is 383 per sq mi which is 3442% higher than the South Dakota average and 323% higher than the national average. The median age in Waubay is 50 which is approximately 35% higher than the South Dakota average of 37. In Waubay, 67% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 85% of Waubay residents were born in South Dakota, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.