What is the capital city of Iowa?

Des Moines is the capital city of Iowa due to its historical and political significance within the state. It was chosen as the capital in 1857 primarily because of its central location, making it easily accessible for a majority of the state's residents. Additionally, Des Moines serves as the hub for the state's government and offers various state government buildings, including the Iowa State Capitol. Over the years, it has developed economically and culturally, further solidifying its position as the focal point of Iowa.

The other cities listed, while notable in their own right, do not hold the title of the capital. Cedar Rapids and Sioux City are significant urban centers in Iowa but serve different roles within the state's structure, primarily as cultural and industrial centers. Iowa City, known for its educational institutions, particularly the University of Iowa, is prominent but is not the capital.