Tulsa, Oklahoma is 3.5 times larger than Topeka, Kansas.
Area: 160 km2 calculated
Topeka is the capital city of the U.S. state of Kansas and the seat of Shawnee County. It is situated along the Kansas River in the central part of Shawnee County, located in northeast Kansas, in the Central United States. As of the 2010 census, the city population was 127,473. Wikipedia
Area: 569 km2 calculated
Tulsa is the second-largest city in the U.S. state of Oklahoma and 46th-largest city in the United States. The population has grown since the 2010 census, With a population of 398,121 as of July 2013. Wikipedia