 Additionally, Tanton co-founded and was heavily involved in the Center for Immigration Studies (CIS), Numbers USA, the American Immigration Control Foundation, American Patrol/Voices of Citizens Together, Californians for Population Stabilization, and ProjectUSA.Donations flow through U.S. Inc., which also supports Scenic Michigan, the International Dark-Sky Association, the Foreign Policy Association's "Great Decisions" Series, and the Harbor Springs chapter of the North Country Trail Association.Tanton served on the Board of Population-Environment Balance.