Camp Douglas, WI has a population of 621 and is the 18,224th largest city in the United States. The population density is 620 per sq mi which is 610% higher than the Wisconsin average and 585% higher than the national average. The median age in Camp Douglas is 37 which is approximately 7% lower than the Wisconsin average of 39. In Camp Douglas, 51% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 81% of Camp Douglas residents were born in Wisconsin, 16% were born out of state, 0% were born outside of the United States and 3% were foreign born.