Containing a collection of 76,989 volumes it serves a population of approximately 46,000 from two locations and circulates 79,118 items annually.

The collection includes photographs, articles of clothing, and war memorabilia from the town's history.

Special attention is given to Civil War hero Major General Philip Kearny Jr. for whom the town is named, including a display of furniture from his Belle Grove home, donated by his granddaughter and second wife.

The museum also includes a full collection of Kearny High School yearbooks.

The museum has a collection of antique clothes and accessories, representing town life between 1850 and 1960, which were donated or are on loan by townspeople.