Columbus, Georgia is 39% larger than Montgomery, Alabama.
Area: 572 km2 calculated
Columbus is a city in and the county seat of Muscogee County, Georgia, United States, with which it is consolidated. According to the most recent U.S. Wikipedia
Area: 411 km2 calculated
Montgomery is the capital of the State of Alabama, and is the county seat of Montgomery County. Named for Richard Montgomery, it is located on the Alabama River, in the Gulf Coastal Plain. As of the 2010 Census, Montgomery had a population of 205,764. Wikipedia