Iowa (USA) is 0.61% larger than Illinois (USA).
Area: 144,669 km2 US Census
Population: 3,090,416 (July 2013) US Census
Iowa is a U.S. state in the Midwestern United States, a region sometimes called the "American Heartland". Wikipedia
Area: 143,793 km2 US Census
Population: 12,882,135 (July 2013) US Census
Illinois is a state in the Midwestern United States. It is the 5th most populous and 25th most extensive state, and is often noted as a microcosm of the entire country. Wikipedia