Westlake is a town in Denton and Tarrant counties in the U.S. state of Texas, and a suburb of the Dallas-Fort Worth metroplex in North Tex…Westlake is a town in Denton and Tarrant counties in the U.S. state of Texas, and a suburb of the Dallas-Fort Worth metroplex in North Texas. The population is 1,623 as of the 2020 United States census.