About MLS

Massachusetts Library System is a 501(c)(3) not-for-profit corporation funded by the Massachusetts Board of Library Commissioners under budget line 7000-9401.


The Massachusetts Library System (MLS) provides services to about 1,600 Massachusetts libraries of all types and sizes throughout the Commonwealth. MLS was established in July 2010 with the following mission:

The Massachusetts Library System, a state-supported collaborative, fosters cooperation, communication, innovation, and sharing among member libraries of all types. The Massachusetts Library System promotes equitable access to excellent library services and resources for all who live, work, or study in Massachusetts.

Inclusion Statement

Our mission has always embraced social justice and the MLS Team is committed to providing services that benefit and contribute to the library profession’s core values: diversity, inclusion, equity, access to information, free expression, privacy, and social justice.

Core Services

Massachusetts Library System provides services to libraries in core service areas:

  • Bibliotemps
  • Commonwealth eBook Collections
  • Consulting
  • Cooperative Purchasing
  • Delivery
  • MassCat
  • Mediated Interlibrary Loan and Journal Article Document Delivery
  • Statewide Databases
  • Summer Library Program
  • Training and Professional Development

Contact Information

Voice: 508-357-2121
Toll Free: 866-627-7228 (in Massachusetts only)
TTY (MassRelay): 800-439-2370 (in Massachusetts only)
Marlborough Fax: (508)-357-2122
Northampton Fax: (413) 586-0727
Email: info@masslibsystem.org


225 Cedar Hill Street, Suite 229
Marlborough, MA 01752

241-243 King Street, Suite 250
Northampton, MA 01060