Richland Center, WI has a population of 5,076 and is the 6,401st largest city in the United States. The population density is 1,091 per sq mi which is 1147% higher than the Wisconsin average and 1104% higher than the national average. The median age in Richland Center is 39 which is approximately 1% lower than the Wisconsin average of 39. In Richland Center, 59% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 77% of Richland Center residents were born in Wisconsin, 19% were born out of state, 1% were born outside of the United States and 3% were foreign born.