Darien, WI has a population of 1,702 and is the 11,974th largest city in the United States. The population density is 1,320 per sq mi which is 1410% higher than the Wisconsin average and 1357% higher than the national average. The median age in Darien is 34 which is approximately 12% lower than the Wisconsin average of 39. In Darien, 64% of the population over 15 years of age are married, 83% speak English and 16% speak Spanish. 55% of Darien residents were born in Wisconsin, 36% were born out of state, 0% were born outside of the United States and 9% were foreign born.