Golconda, IL has a population of 819 and is the 16,444th largest city in the United States. The population density is 1,668 per sq mi which is 650% higher than the Illinois average and 1741% higher than the national average. The median age in Golconda is 41 which is approximately 9% higher than the Illinois average of 37. In Golconda, 41% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 62% of Golconda residents were born in Illinois, 37% were born out of state, 0% were born outside of the United States and 0% were foreign born.