Polk County, Iowa

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Polk County is a county located in the U.S. state of Iowa. As of 2000, the population was 374,601. The 2008 estimate was 424,778.[1] Its county seat is Des Moines[1], which is also the capital city of Iowa. Polk County is one of the five counties that make up the Des Moines–West Des Moines Metropolitan Statistical Area.[2]



Polk County was formed on January 13, 1846. It was named after President James K. Polk.

The first courthouse, a two-story structure, was built in 1846. Construction of a second courthouse was begun in 1858. Due to construction delays and the onset of the Civil War, the structure was not completed until 1866. The present courthouse was erected in 1900 in the Neo-Renaissance style. It was dedicated on October 31, 1906. In 1962, an extensive renovation was undertaken.[3]


According to the U.S. Census Bureau, the county has a total area of 592 square miles (1,533 km²), of which 569 square miles (1,475 km²) is land and 23 square miles (58 km²) (3.81%) is water.

Major highways

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