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2 days ago · 465961. Website. www .dmgov .org. Des Moines ( / dəˈmɔɪn / ⓘ də-MOYN) is the capital and most populous city in the U.S. state of Iowa. It is the county seat of Polk County with parts extending into Warren County. It was incorporated on September 22, 1851, as Fort Des Moines, which was shortened to "Des Moines" in 1857. [6]
