Credit Union of Texas membership is open to almost anyone in the Dallas, TX area: Anyone who lives, works or attends an institution of higher learning in Dallas, Denton, Collin and Rockwall counties. Anyone who lives or works in select areas of Grayson, Fannin, Ellis, Tarrant and Hunt counties. See our coverage map for details. Any member of a school-related association or organization created to service or assist public or private schools. Any employee of these companies/organizations. If your company/organization would like to offer credit union membership, check out how to Become a Select Employee Group. Anyone related (by blood, marriage or adoption) to individuals that meet the qualifications above or is already a member with Credit Union of Texas.