Keller is a suburban city in Tarrant County, Texas, in the Dallas–Fort Worth metroplex. According to the 2010 census, the city's population is 39,627, making Keller the 74th most populated city in Texas. The most recent population estimate, as of Jan. 1, 2018, is 44,940.In the early 1850s, settlers established Keller and the town became a stop on the Texas and Pacific Railway.