Allen is located in Collin County. About 104,627 people live here (as of 2020). Between 2010 and 2020, the population grew from 84,246 to 104,627. The region is at 201 meters above sea level. The area covers about 68.6 square kilometers. There are about 4.965 streets in Allen. The region was founded in 1953. The postal codes are 75002–75013. Allen is city in Collin County, Texas, United States. Among other things, Allen has restaurants, cafés, clothing Stores, schools, banks, hairdressers, dentists, doctors and pharmacies. More information at
www.cityofallen.org.