At Mainstreet Credit Union providing exceptional member service is our commitment to you!

Reach out to us by phone, email or at any of our branch locations and we would be happy to assist you.


Contact your local branch location directly during business hours.

In person

With 14 branches there is a location nearby to serve you!

Use our interactive map to find a branch or ATM closest to you.


Any questions, comments or kudos send us a message online:

By mail

Our general mailing address:

1295 London Road
Sarnia, ON
N7S 1P6

To report a lost or stolen debit card

Contact us immediately if you suspect your card has been stolen or your information has been compromised.


Get web site technical support

If you're experiencing technical difficulties with our website, including being unable to access your online account, please contact our technical support team.

1-888-273-3488 (24 hours a day, 7 days a week)


To file a formal complaint please contact our Complaints Officer