• African Methodist Episcopal Church
• African Methodist Episcopal Zion Church
• Alliance of Baptists
• American Baptist Churches USA
• The Antiochian Orthodox Christian Archdiocese of North America
• Armenian Church of America (including Diocese of California)
• Christian Church (Disciples of Christ)
• Christian Methodist Episcopal Church
• Church of the Brethren
• The Coptic Orthodox Church in North America
• The Episcopal Church
• Evangelical Lutheran Church in America
• Friends United Meeting
• Greek Orthodox Archdiocese of America
• Hungarian Reformed Church in America
• International Council of Community Churches
• Korean Presbyterian Church in America
• Malankara Orthodox Syrian Church
• Mar Thoma Church
• Moravian Church in America
• National Baptist Convention of America
• National Baptist Convention, U.S.A., Inc.
• National Missionary Baptist Convention of America
• Orthodox Church in America
• Patriarchal Parishes of the Russian Orthodox Church in the U.S.A.
• Philadelphia Yearly Meeting of the Religious Society of Friends
• Polish National Catholic Church of America
• Presbyterian Church (USA)
• Progressive National Baptist Convention, Inc.
• Reformed Church in America
• Serbian Orthodox Church in the U.S.A. and Canada
• The Swedenborgian Church
• Syrian Orthodox Church of Antioch
• Ukrainian Orthodox Church in America
• United Church of Christ
• The United Methodist Church

Affiliated Organizations

• American Bible Society
• American Leprosy Mission
• Church Women United
• Churches Uniting in Christ 
• Heifer International
• Interchurch Medical Assistance, Inc.
• Ludhiana Christian Medical College Board
• Lutheran World Relief
• Mennonite Central Committee
• Seventh-day Adventist Church
• Young Men's Christian Association
• Young Women's Christian Association

Church World Service is part of the ecumenical family of the National Council of Churches USA.

(Thanks to Church World Service for this listing)