Rushmore accepts payments by mail, accompanied by your billing coupon. Please note that payments received after 3 pm daily, and all payments received on weekends or holidays, will be processed the next business day. Payments are effective as of the date they are received. Payments By Mail You may send payments to: Rushmore Loan Management Services LLC, PO Box 514707, Los Angeles, CA 90051-4707. Overnight Payments You may send payments to: Rushmore Loan Management Services LLC, 15480 Laguna Canyon Road, Suite 100, Irvine, CA 92618.