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San Marcos Chamber Become a Member Grow your business network Become a Member Grow your business network Become a Member Grow your business network Become a Member Grow your business network Become a Member Grow your business network Become a Member Grow your business network featured EVENTS WELCOME NEW rejoined MEMBERS. MEMBERs LOGIn Here nonmembers sign up here for email updates Full Name Email Yes I would like to receive emails from San Marcos Chamber of Commerce. San Marcos Area Chamber welcomes you. For more than 120 years the San Marcos Area Chamber has been the voice of business.