Middlesex County Library is a system of 15 libraries that provide free access to quality materials and resources to all residents of Middlesex County, staffed by over 70 dedicated, friendly and helpful community members, some of whom are pictured below.Informing, Enriching and Connecting Middlesex County.our mandateTo provide effective and efficient user-driven services to satisfy the information and reading needs of residents, businesses and governments serving Middlesex County. more... See more text