While the population of Diana is unknown due to unincorporation, the school district itself is classified as a 3A by Texas guidelines. New Diana ISD receives quite a few transfers from neighboring towns and cities however due to their stellar reputation in sports and academics.
The lack of incorporation in Diana means that it doesn't have an official population count, but the school district is still classified as a 3A by Texas standards. New Diana ISD attracts many students from nearby communities because of its strong academic and athletic programs.