Series Ledgers, Account Books, and Notes consist of financial record books of various Papineau-owned or affiliated corporations from 1848 to 1882.

Series Legal, Business, and Financial Documents contains receipts, invoices, legal summons and results, bank statements, insurance accounts, and other such documents as well as 7 architectural/technical drawings and 1 photograph.

Series Genealogical Materials contains hand-written genealogies, family histories, newspapers, newspaper clippings, and miscellaneous writings.

Fonds contain the personal and professional dealings of the Papineau Family, beginning with Louis-Joseph Papineau in 1828, following through his descendents, to 1943. Dealings include land grants, social events, real estate, interpersonal and business related financial notices, notes on construction projects supervised by or funded by the Papineau family, and charitable pursuits.
The fonds consists of the following series: Legal, Business, and Financial Documents, Ledgers, Account Books, and Notes, Correspondence & Personal Papers, Genealogical Materials. Majority of the files are titled according to creator rather than content and series are contained within chronological boxes (with the exception of container number 9 belonging to the Legal, Business, and Financial Documents series alongside container number 1 and container number 2).
These materials were created for the purpose of keeping track of the interpersonal and business transactions of the Papineau family.

Series Correspondence & Personal Papers contains private correspondence to, from, and between members of the Papineau Family, including letters, cards, and invitations from 1843 to 1943.