The Mill House Museum contains an eclectic collection of documents, photographs, and other artifacts related to Occoquan's history and that of the surrounding region. Over 400 items are catalogued and many of these are on permanent display. One strength is the Society's collection of Occoquan-related photographs. While a number of these are on display in the Museum, many more have yet to be catalogued and made available to the general public. Of the catalogued items, roughly 20% are ceramics and textiles, 10% are scientific, medical, or technological items, 10% are household objects, 10% are library and archival documents, 10% are photographs, and the remainder fall into assorted miscellaneous categories.

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