If you are a holder of the Citi Simplicity credit card, you have several options to make your card payment. You can pay:
- Online: Log in to your account here and make your payment.
- By Mail: Send your payment to the following address: Citibank, P.O. Box 9001037, Louisville, KY, 40290-1037
- By Phone: The Citibank credit card customer service phone number for Simplicity card payments is 800-950-5114.