First Mennonite Church (Mennonite Church USA), a member of the Pacific Northwest Mennonite Conference, was organized in Aberdeen, Idaho, on 4 July 1907, with a membership of 36 and the Elder Jacob Hege officiating. Mennonites first came to the area in 1905, when the Aberdeen-Springfield irrigation tract was opened to settlers. Canal builders and land promoters invited German-speaking Mennonite farmers to come to Idaho to help settle that area. The church was erected in 1909, enlarged in 1938, and again in 1947. The congregation had a membership of 357 in 1955, and 223 in 2006. In the 1950s it had two missionaries in overseas service.