The papers consist of correspondence, legal papers, diaries, estate records, account books, notebooks, deeds, and miscellanea of the Alsop family of Middletown, Connecticut. Several generations of family members are represented in the papers including: Joseph Wright Alsop (1772-1844), Joseph Wright Alsop (1804-1878), Joseph Wright Alsop (1838-1891), Joseph Wright Alsop (1876-1953), Mary Alsop Oliver Alsop (1815-1893), Richard Alsop (1726-1776), Richard Alsop (1789-1842), Charles Richard Alsop (1802-1865), and John De Koven Alsop (1879-1926). Family mercantile interests in Connecticut and related operations in Bolivia, Chile, and Peru are documented. Files relating to a legal case involving the firm of Alsop & Company, the United States government, and the governments of Bolivia and Chile (1865-1914) are included. The personal papers of several family members are also arranged in the papers.