Forestburg, SD has a population of 145 and is the 25,764th largest city in the United States. The population density is 273 per sq mi which is 2430% higher than the South Dakota average and 202% higher than the national average. The median age in Forestburg is 43 which is approximately 17% higher than the South Dakota average of 37. In Forestburg, 49% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 73% of Forestburg residents were born in South Dakota, 27% were born out of state, 0% were born outside of the United States and 0% were foreign born.