Where do I send checks payable to, or for deposit into, my Alliant Trust Account? Mailing Address (U.S. Postal Service) Alliant Credit Union Attn: Special Services P.O. Box 66945 Chicago, IL 60666-0945 Overnight Service Alliant Credit Union Attn: Special Services 11545 W. Touhy Avenue Chicago, IL 60666 773-462-2182