Sunflower Bank Headquarters
1400 16th St, Ste 250
Denver, CO 80202
Customer Care Center
Available 8 AM-8PM (CT) Monday-Friday and 8AM-4PM (CT) Saturday
CheckIt – Automated Phone Banking
Credit Card & Debit Card Travel Notification
Traveling? Purchases not typical with your spending patterns may trigger fraud alerts for your protection. Call us in advance of any atypical travel or unusual purchase plans. If you are traveling internationally, beyond Canada and Mexico, you must notify us in advance if you intend to use your debit card.
Report a Lost or Stolen Debit Card
Request for Information or Notice of Errors must be sent to:
Guardian Mortgage, a division of Sunflower Bank, N.A.
P.O. Box 833890
Richardson, TX 75083-3890
Whether a compliment, complaint or suggestion – we’d love to hear from you. Please take a moment to help us enhance our service levels, elevate our product offerings or give us a pat on the back if you love your bank.
At Sunflower Bank, we are committed to providing a website that is accessible to all of our site visitors. If you have any difficulty accessing any of the information on SunflowerBank.com, or have any suggestions for accessibility improvements we could make, please call 888.827.5564 or email CustomerService@SunflowerBank.com.