The Middlesex County 4-H Fair, Inc. is a private 501(c)(3) non-profit organization. All proceeds from the 4-H Fair are used to fund improvements to our facility and grounds as well as to run future fairs. Please address all correspondence and checks to: Middlesex County 4-H Fair, Inc., P.O. Box 352, Westford, MA 01886-0352. The Middlesex County 4-H Fair, Inc. works in partnership with University of Massachusetts Extension through a Memorandum of Agreement in support of successful and productive 4-H programming and resource development.