The Bronx County Archives contains 80 separate collections (5,000 cubic feet) pertaining to The Bronx, dating from 1850 to the present. A representative sampling includes: deeds and town charters; papers of many prominent 18th-, 19th-, and 20th-century Bronx families; businesses and associations such as The Bronx Board of Trade and the Bronx Borough Presidents, Bronx Grand Jurors’ Association, The Bronx Chamber of Commerce, and The Bronx County Historical Society. The Archives also has 380 19th- and 20th-century police department blotters, 520 19th- and 20th-century fire department journals, and 500 paintings and prints. An inventory of the manuscript holdings has been completed and comprehensive guides to these holdings and additional finding aids to selected collections are available.

A recent focus of activity has been the survey and acquisition of records of African Americans and Latinos in The Bronx. The Bronx African American History Project is a joint collaboration of The Society and Fordham University’s Department of African and African American Studies. In addition to preserving paper records of African American history in The Bronx, this project has also conducted 250 oral histories of African Americans in the borough, produced two museum exhibitions, eight Journal articles, and dozens of walking tours, lectures, and two Bronx Music celebrations.