Humboldt in its beginnings was primarily German Catholic. It became the largest settlement in the Territorial Abbey of Saint Peter-Muenster also called St. Peter's Colony established by Benedictine monks from St John's Abbey in Collegeville, Minnesota. Immigration to the area from both the Northern Plains states of the US and Germany was promoted by the German American Land Company. Many immigrants from the German Empire settled in areas in and around Humboldt such as Muenster, Fulda, Pilger, St Gregor and Englefeld. Immigrants from the Russian Empire who were ethnic Germans settled in the area west of Humboldt and south of the hamlet of Carmel.