St. John Catholic Church in San Marcos is a community of faithful Christians who generously share their time, talent and treasure in service to God. It is a multi-cultural, multi-lingual and multi-generational community that gathers to worship, celebrate, educate and evangelize. We serve over 1,800 families and we are growing every day. This San Marcos Church has been serving the community since 1883, but the Universal Catholic Church has been serving the world since 33 A.D. The information on this website will help you find your place in parish life and your soul’s way to Jesus Christ. Welcome to St. John!