Series I. Charles Moses Endicott (1793-1863) Family Papers, 1794-1886, contains correspondence and financial papers of Charles, his wife Sarah (Blythe), and members of Sarah's family. Charles' and Sarah's papers are almost entirely of a personal nature. The only documents relating to Charles' shipping careers are a few accounts and memorandums. Charles' 23-year employment with the Salem Bank is not documented in these papers. Charles' and Sarah's correspondence includes letters received and letters written to Sarah's mother, Sarah Ingersoll. The bulk of the correspondence reports on family and friends, including the movements of Sarah's brother-in-law, Captain Philemon Putnam, while he was at sea, and the death of her sister Lucy in 1839. The correspondence also contains a few letters regarding Charles' memoir of Governor John Endicott and other genealogies upon which he worked. Of interest is a letter from Jonathan I. Bowditch who describes the burning of his house in Boston in 1857 and mentions the articles which were saved from the fire.

The bulk of Charles' bills and receipts are personal or household. Included however are two 1848 receipts for the East India Marine Society, of which he was president, a bill for the 1845 painted copy of Governor John Endicott's portrait, and receipts for the printing and binding of his "Memoir of John Endicott."

The correspondence of Jonathan Ingersoll, Sarah's stepfather, contains letters regarding his shipping concerns and his sheep farm, as well as personal letters from his son George, and grandchildren Henry I. and Nathaniel I. Bowditch, and Mary Dixwell.

The personal correspondence of Lucy (Blythe) and Philemon Putnam includes correspondence with their mother Sarah Ingersoll and their sister Sarah R. Endicott. Additional passages written by Lucy may be found appended to letters written by Sarah and Charles Endicott.

The family papers include correspondence and accounts of Charles' and Sarah's sons, Charles Edward and Ingersoll Bowditch, and a few estate receipts of Sarah Ingersoll.