Gilbert, Arizona is 2.9 times larger than Pasadena, Texas.
Area: 363 km2 calculated
Gilbert is a town in Maricopa County, Arizona, United States, located southeast of Phoenix, within the Phoenix metropolitan area. Once known as the "Hay Shipping Capital of the World", Gilbert is currently the most populous incorporated town in the United States. Wikipedia
Area: 123 km2 calculated
Pasadena is a city in the U.S. state of Texas, within Houston–The Woodlands–Sugar Land metropolitan area. As of the 2010 U.S. Census, the city's population is 149,043 making it the seventeenth most populous city in the state of Texas as well as the second-largest city in Harris County. Wikipedia