Area 145,743 km² Residents 3,134,693 Residents per km² 21.5 Capital Des Moines Postal Code IA ISO-3166-2 code US-IA FIPS code 19 Abbreviated as IA by AbbreviationFinder, Iowa has been the 29th state in the United States of America since joining the Union on December 28, 1846 . The state is located in the Midwest and […]