How do I pay my Alliant loan via check? Write a check with the 14-digit loan account number on the memo line, or attach a loan payment coupon and send to: Auto, RV, Personal & HELOC Loan Payments: Alliant Credit Union PO Box 2387 Des Plaines, IL 60017-2397 Credit Card Payments: Alliant Credit Union PO Box 1666 Des Plaines, IL 60017-2397 Mortgage Payments: P.O. Box for Mortgage Loan Payments (varies by state of property) NOTE: Mortgage payments sent to PO Boxes other than those specified below may be returned resulting in late fees and delinquent credit reporting. AZ, CA, HI, NV - PO Box 7168, Pasadena, CA 91109-7168 IA, IL, MN, MO, ND, NE, SD, TN, WI - PO Box 0054, Palatine, IL 60055-0054 CT, DC, DE, IN, KY, MA, MD, MI, NC, NJ, NY, OH, PA, RI, SC, VA, WV - PO Box 371306, Pittsburgh, PA 15250-7306 AK, AL, AR, CO, FL, GA, ID, KS, LA, ME, MS, MT, NH, NM, OK, OR, TX, UT, VT, WA, WY - PO Box 660592, Dallas, TX 75266- 0592
