Huntsville, Alabama is 45% 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: 567 km2 calculated
Huntsville is a city located primarily in Madison County in the central part of the far northern region of the State of Alabama. Huntsville is the county seat of Madison County. The city extends west into neighboring Limestone County. Huntsville's population was 180,105 as of the 2010 census. Wikipedia