Long Hollow, SD has a population of 290 and is the 22,672nd largest city in the United States. The population density is 20 per sq mi which is 86% higher than the South Dakota average and 78% lower than the national average. The median age in Long Hollow is 19 which is approximately 48% lower than the South Dakota average of 37. In Long Hollow, 33% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 87% of Long Hollow residents were born in South Dakota, 13% were born out of state, 0% were born outside of the United States and 0% were foreign born.