Corporate Office
2023 Gold Canyon Dr.
San Antonio, TX 78232

General Mail
P.O. Box 701650
San Antonio, TX 78270-1650

Secure Messaging
Log into digital banking to send a secure message.


Reach Out

Member Care Center

Local: 210.442.0100
Toll Free 800.683.1211

Mon - Fri: 7:00 am - 7:00 pm
Sat: 9:00 am - 4:00 pm

Loan Application Line

Local: 210.442.0199

Mon - Fri: 7:00 am - 7:00 pm
Sat: 9:00 am - 4:00 pm

24/7 Automated Teller

Local: 210.366.2255
Toll Free 800.683.1211

24/7 Debit & Credit Card Numbers

Support: 888.918.7313
Fraud Department: 800.235.7728

Report Lost or Stolen Cards

Credit Card: 866.820.3034
Debit Card: 866.820.0995

24/7 Account Access

The free Firstmark Credit Union App allows members to securely view account balances, deposit checks, transfer funds and more.


Learn More

Card Controls

To lock/unlock a card, login to Online Banking. Select your account and click “Card Controls.” Choose the card you wish to lock or unlock.


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Visit Us


We have 13 convenient locations in San Antonio, Fredericksburg, La Vernia, and New Braunfels, Texas. Book an appointment to avoid a wait!


Lobby Hours

Mon - Fri: 9:00 am - 5:00 pm
Sat: 9:00 am - 1:00 pm*

Sun: Closed


Drive-Thru Hours

Mon - Fri: 9:00 am - 5:00 pm
Sat: 9:00 am - 1:00 pm*

Sun: Closed


*Select locations include Culebra, Fredericksburg, TX, Jefferson, La Vernia, TX, Legacy, Mission, and New Braunfels, TX


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