The Northwest Branch Library serves about 13,000 residents of Lake Mary City in Seminole County, Florida. The library belongs to the Seminole County Public Library member and provides resources that contribute to over 519,000 volumes on hand and 2.1 million items circulated annually by the library system. In addition to books, eBooks, audiobooks, magazines, music, and videos, the branch offers meeting space, 3D printing services, and early literacy programs like storytime.

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