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  • Although this is a secure website, this form is best used for general inquiries. Caution should be exercised when transmitting personal account information online. To submit sensitive information, please log into your online banking account and use the Communications Center or visit a branch location.

Customer Care Center

Member Service Line:

(414) 546-7450

Guardian Line/24-Hour Telephone Teller:

(414) 856-9323

Debit Card Activation/PIN Change:

Domestic: (866) 762-0558 or
International: (501) 588-7531

Lost or Stolen Debit Card:

Within U.S.: (888) 241-2510 or
Outside U.S.: (909) 941-1398

Lost or Stolen Credit Card:

(855) 633-0299

Contact Us By Mail

Guardian Credit Union

7801 S. Howell Avenue
Oak Creek, WI 53154

Locations + Hours

Need a password for the Guardian Line?

The first time you call, your access code will be the last four digits of your social security number. After accessing the Guardian Line for the first time, you will be asked to personalize your access code. If you need help, please call our Member Service Line (414) 546-7450.

Credit Union Service Centers

Through a network of shared branches, you can access your Guardian Credit Union accounts at thousands of convenient locations nationwide. Whether you are at work, home, or your favorite travel destination, your credit union is always nearby.

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