About the Monroe County Library System

The Monroe County Library System (MCLS) is a 16 branch public library system in Monroe County, Michigan.

Thumbnails of the library branches

MCLS offers a variety of electronic services including circulation, online catalog of materials, online journals and databases, Mobile Outreach Senior services, and Internet resources. Circulation is in excess of 1.3 million items a year.

The Monroe County Library System serves approximately 105,975 patrons. Currently, children ages 0-14 make up 18.9% of the county’ population, teens ages 15-19 comprise 7.1% of the population, and senior citizens account for 13.7% of the population. Just as the ages of our patrons vary, so do their reasons for coming to the library. Patrons come to the library to check out materials, get homework help, find jobs, research genealogy, attend programs, use the computers or copiers, or to find a quiet place to study.


MCLS anticipates many changes as it looks forward to growing with the community. While we are founded on items such as books, genealogical materials, local history collections and government depository materials, we have expanded our focus on eBooks, eMedia, and our online presence.