River Hills, WI has a population of 1,548 and is the 12,495th largest city in the United States. The population density is 300 per sq mi which is 243% higher than the Wisconsin average and 231% higher than the national average. The median age in River Hills is 48 which is approximately 24% higher than the Wisconsin average of 39. In River Hills, 73% of the population over 15 years of age are married, 88% speak English and 1% speak Spanish. 59% of River Hills residents were born in Wisconsin, 30% were born out of state, 2% were born outside of the United States and 8% were foreign born.