The Jared and Susannah Arnold papers consist primarily of correspondence written between the couple and their children in the early 19th century. The earliest items in the Correspondence series, which makes up the bulk of the collection, are personal letters written and received by Jared Arnold and Susannah Brainerd before their marriage; these include material from Jared to his brothers, Simon and Joseph, as well as several addressed to Susannah by female friends. Many of the early letters detail the couple'scourtship; following their marriage, they corresponded with friends and family about their travels to New York, Baltimore, and other cities on the East Coast. Later material in the collection reflects the lives of the Arnolds' three sons, who frequently wrote their parents and, less often, each other; their son Owen, for example, shared his experiences at Yale College in the mid-1830s, and on one occasion detailed his expenses (February 6, 1835). Later, Owen wrote from his teaching post in Milledgeville, Georgia, while Jared drew a map of land along the Chemung River near Elmira, New York;
Owen's letter of April 27, 1843 contains several pencil sketches, including a hawk and rough patterns. Two of the letters are written on printed reports: the Commercial Reporter and Shipping List from Mobile, Alabama (December 6, 1837) and a report of "The Trustees of the Planters and Merchants Bank of Mobile" (April 3, 1847).
Documents in the collection include two shipping receipts; a document related to the ownership of the Exchange , of which Jared Arnold was captain, by Jozeb and Horace Stocking; and a power of attorney appointing Jared Arnold legal representative for Jozeb Stocking.