Find information on all the customer service resources available from OneWest Bank, including the toll free customer service number and specific contact information by banking department.

For general questions about current accounts and products, the OneWest Bank customer service number is 1-877-741-9378.  OneWest Bank customer service representatives are available at this number on Monday through Friday 6:00 am – 6:00 pm and Saturday 7:00 am – 3:00 pm (PST).

Automated customer service at OneWest Bank can be reached at 1-877-741-9378.  Automated customer service is available 24 hours-a-day, seven days-a-week.

Email contact with OneWest Bank can be initiated through the contact page on the bank web site located at

The OneWest Bank Corporate Headquarters is at:
OneWest Bank N.A.
888 East Walnut Street
Pasadena, CA 91101

The mailing address for standard correspondence can be sent to:
OneWest Bank N.A.
P.O. Box 7056
Pasadena, CA 91109-9699

The general inquiries fax number is 1-626-229-1891.

For new or existing customers who want to obtain a mortgage loan or refinance an existing mortgage loan, OneWest Bank mortgage representatives can be reached at 1-888-321-FUND.  OneWest Bank mortgage representatives are available Monday through Friday 8:00 am – 5:00 pm PST.

The OneWest Bank home lending office can be reached via mail at:
OneWest Bank Home Lending
1 Banting
Irvine, CA 92618

Bank customers that need to report a lost or stolen ATM card or Visa Check Card can call the main customer service number or 1-800-236-2442 for after hours telephone assistance.

OneWest Bank credit card customer service resources are available by calling 1-866-446-0404.

For customer service inquiries about OneWest Bank commercial banking products and services the toll free number is 1-877-202-4645.

Customers of the bank that believe they are the victim of online fraud, identity theft or a scam, can notify the bank by either calling 1-877-331-3785 Monday through Friday 8:00 am – 9:00 pm (EST) or via e-mail at

For customers who have questions about their existing commercial real estate loan with OneWest Bank Commercial Real Estate Group (CREG), customer service can be reached toll free at 1-800-626-3663.  OneWest Bank Commercial Real Estate Group (CREG) customer service hours are Monday through Friday 7:30 am – 5:30 pm and Saturdays 8:00 am – 12:00 p.m. (PST).

Additional bank resources including FAQs, banking forms, and related self help customer service assistance can be found at the bank web site located at

OneWest Bank is a regional bank based in California that operates over 70 retail branches throughout Southern California.  The bank serves consumers and businesses with a wide array of banking products and services.  The bank was established in 2009 and is headquartered in Pasadena, California.  OneWest is an FDIC insured institution and funds deposited in the bank are insured up to the maximum FDIC insurance limit per depositor.

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