Northwest ISD covers numerous cities in Tarrant, Denton, and Wise counties, including: 1.Corral City, 2.Portions of Flower Mound, 3.Justin, 4.Marshall Creek, 5.Northlake, 6.Roanoke, 7.Parts of Southlake, 8.Trophy Club, 9.Aurora, 10.Parts of New Fairview, 11.Newark, 12.Pecan Acres, 13.Rhome, 14.Avondale, 15.Portions of Fort Worth, 16.Haslet, 17.Parts of Keller, 18.Areas of Westlake