San Marcos Chamber of Commerce
- Chamber calendar, business directory, and member discounts.
- http://www.sanmarcoschamber.com/

Old World Traditions
- Construction and remodeling products that include: custom doors, tile, art, murals, and wrought iron.
- http://www.old-world-traditions.com/

City of San Marcos
- Official home page for the city. Lists government departments, building and planning forms and permits, schools, and job openings.
- http://www.ci.san-marcos.ca.us/