Waco, Texas is 66% 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: 266 km2 calculated
Waco is a city which is the county seat of McLennan County, Texas, United States. It is situated along the Brazos River and I-35, halfway between Dallas and Austin. The city had a 2010 population of 124,805, making it the twenty-second most populous city in the state. Wikipedia