http://www.fh.az.gov/ Fountain Hills is a town in Maricopa County, Arizona, USA, neighboring the Fort McDowell Yavapai Nation, Salt River Pima-Maricopa Indian Community, and Scottsdale, Arizona. The population is 24,669, as of the 2006 Census. It was the eighth fastest-growing place among cities and towns in Arizona between the 1990 and 2000 censuses. It has the world's fourth tallest fountain. The town has two annual fairs, a local art fair and the Fountain Hills Great Fair which incorporates arts and a carnival. Each year the town's fountain is dyed green in celebration of St. Patrick's day.