Mailing Address: City of Houston / P.O. Box 1562 / Houston, TX 77251 Physical Address: City of Houston / 901 Bagby / Houston, TX 77002 City Hall Annex Address: 900 Bagby / Houston, TX 77002 City Switchboard: 713.837.0311 or 3-1-1 City TDD: 713.837.0215