It may be Santa Fe, New Mexico: -
With 65,000 residents, Santa Fe is New Mexico�s third largest city. It was originally settled by Spaniards before1607, and is now the oldest state capital city in the United States. Its original name �La Villa Real de Santa Fe de San Francisco de Asis�, is Spanish for �the Royal City of the Holy Faith of St. Francis of Assisi�.
http://www.usatourist.com/english/places/newme xico/santafe.html
this info is from a tourist office, and there may be rival claims!!