The San Marcos Library is operated by the County of San Diego. It is located at 2 Civic Center Drive, on the campus with City Hall and the Community Center.

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San Marcos Library
2 Civic Center Drive
San Marcos, CA 92069 
(760) 891-3000
Hours:
Monday-Thursday, 9:30 am to 8 pm
Friday and Saturday, 9:30 am to 5 pm
Sunday, 12 to 5 pm