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Permian Basin Mensa encompasses the areas within the zip codes (as defined by the United States Postal Service) 76800-76999, and 79200-79799.
All or part of the following 44 Texas counties are in Permian Basin Mensa: Andrews, Borden, Brown, Callahan, Coke, Coleman, Concho, Crane, Crockett, Dawson, Ector, Fisher, Gaines, Glasscock, Howard, Irion, Jeff Davis, Jones, Kimble, Lampasas, Llano, Loving, Martin, Mason, McCulloch, Menard, Midland, Mills, Mitchell, Nolan, Pecos, Reagan, Reeves, Runnels, San Saba, Schleicher, Scurry, Sterling, Sutton, Taylor, Tom Green, Upton, Ward, Winkler