Pasadena is a city in the U.S. state of Texas, within the Houston–The Woodlands–Sugar Land metropolitan area. As of the 2020 U.S. census, the city's population was 151,950, making it the twentieth most populous city in the state of Texas, as well as the second-largest city in Harris County. The area was founded in 1893 by John H. Burnett of Galveston, who named the area after Pasadena, California, because of the perceived lush vegetation.