Columbus, Ohio is 9 times larger than Ann Arbor, Michigan.
Area: 77 km2 calculated
Ann Arbor is a city in the US state of Michigan and the county seat of Washtenaw County. The 2010 census recorded its population to be 113,934, making it the sixth largest city in Michigan. Wikipedia
Area: 694 km2 calculated
Columbus is the capital of and the largest city in the U.S. state of Ohio. It is the 15th largest city in the United States with a population of 822,553. It is the core city of the Columbus, OH Metropolitan Statistical Area, which encompasses a ten county area. Wikipedia