The Presbyterian Church (U.S.A.), or PC(USA), is a mainline Protestant Christian denomination in the United States. Part of the Reformed tradition, it is the largest Presbyterian denomination in the U.S. The PC(USA) was established by the 1983 merger of the former Presbyterian Church in the United States, whose churches were located in the Southern and border states, with the United Presbyterian Church in the United States of America, whose congregations could be found in every state.
With 2,077,158 members and 13,462 ordained ministers in 10,657 congregations in 2009, the reunited denomination is the most visible and influential Presbyterian denomination in North America. The denomination reported a loss of 61,047 members (-2.9%) in 2010 and had a membership of 2,016,091 at the end of 2010. Denominational offices are located in Louisville, Kentucky. The PC(USA) is a member of the National Council of Churches, the World Communion of Reformed Churches, the World Council of Churches, and Christian Churches Together.
Source: Wikipedia, "Presbyterian Church (U.S.A.)", available under the CC-BY-SA License.