Overland Park, Kansas is 91% larger than Round Rock, Texas.
Area: 168 km2 calculated
Overland Park is the second most populous city in the U.S. state of Kansas. Located in Johnson County, it is a suburb of Kansas City, Missouri and the second most populous city in the Kansas City metropolitan area. As of the 2010 census, the city population was 173,372. Wikipedia
Area: 88 km2 calculated
Round Rock is a city in the state of Texas within the Greater Austin, Texas metropolitan area and Williamson County. The 2013 census estimate places the population at 109,821. Wikipedia