Plano is a city in North Texas with 5 letters. It is located in Collin County and is part of the Dallas-Fort Worth metropolitan area. Denton is another city in North Texas with 6 letters. It is the county seat of Denton County and is known for its vibrant music scene. Amarillo is a city in North Texas with 8 letters. It is the 14th most populous city in the state and is the economic center of the Texas Panhandle region.