The Catonsville Historical Society Inc., is a non-profit organization that was organized in 1973 after the late Mrs. Robert Townsend had bequeathed her home and, her collection of 18th and early 19th century antiques to the Society. Her decorator workshop, which was next to the house, was later remodeled and enlarged for an office, meeting room, and museum to house Catonsville memorabilia. The enlarged and remodeled area ultimately became the Pullen Museum.

The Society currently maintains a membership of over 700 people, runs tours of the Townsend House and Pullen Museum, and hosts a variety of activities. Additionally there is a Genealogy Section of the Society that meets once a month.