Classis Columbia is made up of the following churches in Eastern Washington, Oregon and Idaho.
Idaho
Grangeville Grangeville CRC
Oregon
Beaverton (Portland) Oak Hills
Beaverton - (Portland) Zion Korean
McMinnville - Sunrise
Portland - Parklane
Salem - Sunnyslope
Tualatin (Portland) - Christ Community
Washington
Battle Ground - Crossway Church
Quincy - Iglesia Cristiana Reformada de Quincy
Quincy - Quincy CRC
Spokane - New Hope
Sunnyside - Iglesia Evangelica Cristiana Reformada de Sunnyside
Sunnyside - Sunnyside
Toppenish - Iglesia Cristiana Reformada Vida Abundante
Yakima - Faith Alive
Zillah - Faith Community