High Quality Content by WIKIPEDIA articles! The Roman Catholic Archdiocese of Santa Fe is an ecclesiastical territory or diocese of the southwestern region of the United States in the state of New Mexico. While the motherchurch, the Cathedral Basilica of Saint Francis of Assisi, is in the City of Santa Fe, its administrative center is in the City of Albuquerque. The Diocese comprises the counties of Rio Arriba, Taos, Colfax, Union, Mora, Harding, Los Alamos, Sandoval, Santa Fe, San Miguel, Quay, Bernalillo, Valencia, Socorro, Torrance, Guadalupe, De Baca, Roosevelt, and Curry.