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YES the San Clemente in California does have a San Clemente police department.
No, San Diego is South of San Clemente.
The address of the San Clemente Branch Library is: 242 Avenida Del Mar, San Clemente, 92672 4005
The address of the San Clemente Historical Society is: Po Box 283, San Clemente, CA 92674-0283
The address of the Heritage Of San Clemente Foundation is: Po Box 456, San Clemente, CA 92674-0456