Ankeny is a city in Polk County, Iowa, United States. It is part of the Des MoinesWest Des Moines Metropolitan Statistical Area. Ankeny started off as just one square mile, and just 445 people. Electricity was first introduced in 1907. Ankeny's first fire department was first established in 1907 and was volunteer based. They had only three ladders and 14 water pails when the department started.