Began as a mission in 1902 in Chicago Heights, Illinois in a local hall. The congregation was able to build its first building in 1905. The church was a vibrant, growing congregation for many years. In addition to the Women's Guild Auxiliary, the mission organized a choir, Bishop Anderson Guild, Saint Monica's Altar Guild, a young people's organization and a church school. In 1947, it officially became a Church. It began a slow and steady decline as parishioners began to move to larger churches in neighboring suburbs. During the 1990s, Saint Ambrose Church joined with Christ the King Church (Lansing, Ill) and Church of the Good Shepherd (Momence, Ill) to form the Trinity Episcopal Ministry. All efforts to grow failed and the church held its last service on July 24, 2005.