There are still Union Churches in Pennsylvania. The church to which I belong, Ziegels Union Church, recently celebrated 250 years of joint ministry in our community (Weisenberg Township, Lehigh Co.) The German Reformed Church, as a previous writer noted, merged into the Evangelical and Reformed Church and in 1957 into the United Church of Christ. The Evangelical and Reformed Historical Society, located at Lancaster Theological Seminary, is a wonderful resource for anyone looking into the Reformed Church. Many churches set up a union for economic reasons; two congregations could more readily support the operating expenses of a church building. Over time, some of the Reformeds intermarried with Lutherans, so it is useful to check both sets of records in searching for genealogical information. Many churches which at one point were union have divided into separate churches, but there are still some which continue to operate as a joint ministry. FYI If anyone is interested in a 52 page commemorative booklet on the history of Ziegels Union Church, the church is selling extras for $10 plus $2 shipping. Write to the church at 9990 Ziegels Church Rd., Breinigsville, PA 18031.