Columbus, Georgia is 47% larger than Chattanooga, Tennessee.
Area: 390 km2 calculated
Chattanooga is the fourth-largest city in the U.S. state of Tennessee, with a population of 167,674 as of the 2010 census, and an estimated population of 171,279 in 2012. It is the seat of Hamilton County. Wikipedia
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