The enthusiasm generated by the announcement of a new headquarters brought in numerous contributions of furniture, artifacts, paintings, rare documents and books.
In that year, the first of five historic properties came to the MCHA when Mrs. J. Amory Haskell purchased, restored and furnished Marlpit Hall (circa 1756) in Middletown, and then presented it to the organization.
In 1999, the MCHA acquired an important example of the Victorian style, the Taylor-Butler House (circa 1853), built by later generations of the Taylor family of Marlpit Hall, which is on the adjoining property.
The Monmouth County Historical Association is recognized as one of the country's leading local history organizations and remains committed to making its museum and research collections accessible to the public through publication, educational programs, outreach activities and an annual changing and permanent exhibition program.
The Library and Archives house over 200,000 documents pertaining to the area and its residents, in addition to comprehensive collections of genealogies, reference books, photographs, and local newspapers.