Fourth Congregational Church of Chicago traces its origins back to a Congregational Sunday school which started in 1867 and met in a blacksmith shop. From this Sunday school sprang three churches, Grace, Cortland Street, and Maplewood. These three churches merged in 1916 and took the name Fourth Church. The records include finances, youth education and outreach, membership records, correspondence, reports, and church newsletters.

The Washington Park Congregational Church was gathered in 1891 and remained open until 1927. It was located on South Michigan Ave in the Washington Park area of Chicago. The records in this collection gather together administrative and organizational records, ministerial and church correspondence, and the church's vital records.