The Warren County Historical Society was organized in 1970 for the purpose of preserving the history of Warren County. The Society is a not-for-profit corporation, and has 501-C3 status through the Internal Revenue Service. The need for a facility in which to preserve and display the collection of items donated to the Society led to the construction of the Museum and Library in 1982. The construction was financed entirely by donations from present and former Warren Countians. In 2009, the Society received a bequest from R. Stuart Hummel of Sonoma, CA to be used for an addition to the Museum. The Hummel Addition, which doubled the size of the building, opened in May 2012.