Chattanooga, Tennessee is 2.6 times larger than Dayton, Ohio.
Area: 390 km2 calculated
Population: 171,279 (2012)
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: 149 km2 calculated
Population: 141,359 (2012)
Dayton is the sixth largest city in the U.S. state of Ohio and is the county seat of Montgomery County. Wikipedia