High Quality Content by WIKIPEDIA articles! Plano (pronounced /?ple?no?/) is an affluent northern suburb of Dallas, Texas. Located mostly within Collin County, the population was 222,030 at the 2000 census, making it the ninth-largest city in Texas. According to a 2008 census estimate, Plano grew to 267,480 residents, making it the 70th most populous city in the United States. Plano is within the Dallas?Fort Worth metropolitan area, colloquially referred to as the Metroplex. The city is home to many corporate headquarters, including Ericsson Inc., Rent-A-Center, Crossmark, Perot Systems, Electronic Data Systems, JCPenney, Frito-Lay, Cinemark Theatres, Dr Pepper Snapple Group and UGS.