Katy is a city located in Harris, Fort Bend and Waller Counties in the U.S. state of Texas, within the Houston–Sugar Land–Baytown metropolitan area. The population was 11,775 at the 2000 census. Katy, suburb of Houston, Texas, is named for the Missouri-Kansas-Texas Railroad (commonly referred to as the K-T Railroad, now a part of Union Pacific) that ran through Katy in the 19th century.[citation needed] Katy was once known as Cane Island.