The Roman Catholic Archdiocese of Galveston-Houston (Latin: Archidioecesis Galvestoniensis Houstoniensis) encompasses 8880 square miles (23000 km2) of ten counties in the southeastern area of Texas: Galveston; Harris; Austin; Brazoria; Fort Bend; Grimes; Montgomery; San Jacinto; Walker; and Waller.The chancery of the archdiocese is located in Downtown Houston. The archdiocese’s original cathedral church is St.
Brazoria County Texas, Montgomery County Texas, Austin County Texas, County (United States), Fort Bend County Texas, Grimes County Texas, Harris County Texas, San Jacinto County Texas, Walker County Texas, Waller County Texas