About Dallas: Counties: Dallas, Collin, Denton, Rockwall, Kaufman
Mayor: Mike Rawlings
Area Codes: (214) (512) (817) (940) (469) (682) (903) (972)
Doing Business in Dallas? Here’s what you need to know. Business licenses can be obtained at the City of Dallas, located at 1500 Marilla Street, Dallas, TX 75201 or by calling 1.214.670.3111. They can also help with questions on zoning, taxes, and security alarm permits.