Township resident Maude Kenyon founded the Tewksbury Historical Society on February 19, 1989. The Society is organized exclusively to further research into and the preservation and dissemination of the history of the Township of Tewksbury, Hunterdon County, New Jersey. The Tewksbury Historical Society is a non-profit organization under the Internal Revenue Code (IRS) 501 (c) (3). The Society is also a New Jersey nonprofit corporation having been incorporated on January 9, 1992. The Society is governed by an 11 member Executive Committee made up of four officers (President, Vice-President, Secretary and Treasurer) who are elected by the membership for two-year terms and 7 chairmen of standing committees. This Executive Committee, with the exception of choosing a nominating committee, conducts all affairs of the Society.

The Society offers membership to individuals and families to anyone, resident or non-resident. The annual cost is $ 15 per individual or $ 25 per family. The Society also offers honorary membership to any member or descendant of a family who resided in Tewksbury prior to 1900. Currently the Society has over 200 families as members, with some in Pennsylvania, Florida and Connecticut. The general membership of the Society meets four times per year with the annual meeting held in January of each year. Business is conducted at these meetings followed by a program or speaker on a topic of local interest. The Society also conducts fund-raisers throughout the year to raise money for a building fund. The Society's major fund-raiser is its annual Art Show and Sale, held every October. The event draws anywhere from 80 to 100 artists from the tri-state area to exhibit their works.

The Society entered into a lease in 1999 with the Township of Tewksbury to utilize a portion of the old Municipal Building in Mountainville as its headquarters. This building was the former one-room Mountainville Schoolhouse. Up until recently the Society had been unable to collect documents and papers because of it not having any location to put them in. The Society's headquarters, which will act as an office as well as a museum, is open to the public by appointment and will soon have standing hours, where people will be able to view historical collections and conduct research. The Society was bequeathed a desk, owned by the Waldron family and formerly belonging to Dr. Oliver Barnett, who was the first physician in Oldwick and for who the schoolhouse in what was then New Germantown, now Oldwick, was named.