Brentwood is a neighborhood in central Austin, Texas. Brentwood comprises United States Census tracts 15.05 and 2.05, and ZIP Codes 78756 and 78757. The area is bordered by Burnet Road and Allandale to the west, North Lamar Boulevard and North Loop on the east, 45th Street and Rosedale to the south, and Justin Lane and Crestview to the north. Running through the middle of the area is a tree-lined street named Arroyo Seco, which follows a creek of the same name.