Plano ( PLAY-noh) is a city in the U.S. state of Texas, where it is the largest city in Collin County. Plano is also one of the principal cities of the Dallas-Fort Worth metropolitan area. With a population of 285,494 at the 2020 census, it is the ninth most-populous city in Texas, and, respectively, the 72nd most populous city in the United States. Plano's economy is a large part of Dallas' economy, home to many large companies such as Frito Lay, JCPenney, Pizza Hut, and other major distributors. Plano has also been named as both one of the fastest growing cities and one of the best places to live in the country.