Roman Catholic Archdiocese of Guadalajara Tags: Clerical Administrative Region, Diocese.The Roman Catholic Archdiocese of Guadalajara (Latin: Archidioecesis Guadalaiarensis) is a Roman Catholic archdiocese based in the Mexican city of Guadalajara Jalisco. It currently covers an area of 20827 km² (8044 Square Miles). thumbnail area (km2) 2.08339e+10 Established 13 July 1548 ( years ago) jurisdiction Diocese Learn more... Loading...