Bank Routing Number

Bank of San Francisco Routing Number

The primary ABA routing number (RTN) for Bank of San Francisco, San Francisco, CA is shown below.

Primary ABA / RTN

121044055

Verify before you send money. This is the bank's primary registered routing number, taken from the FFIEC National Information Center institution record (last refreshed here on October 8, 2026). Banks often use a different routing number for wire transfers than for ACH, and large banks vary it by region; always confirm the correct number on a check or with your bank before initiating a transfer.

What is an ABA routing number?

An ABA routing number, also called a routing transit number (RTN), is a 9-digit code that identifies a U.S. financial institution in the payment system. It tells ACH transfers, Fedwire payments, and paper checks which bank to route money to. The format was created by the American Bankers Association in 1910 and is still the backbone of U.S. domestic payments.

What is the difference between a routing number and an account number?

Your routing number identifies the bank; your account number identifies your specific account at that bank. On a paper check, the routing number is the 9-digit number in the bottom-left, and the account number is to its right.

What is the Bank of San Francisco routing number?

The Bank of San Francisco routing number is 121044055. It is the primary ABA routing transit number registered to Bank of San Francisco, headquartered in San Francisco, CA. A bank can hold more than one routing number, so this is the one on record for the institution, not necessarily the one printed on every check. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 8, 2026.

What is the Bank of San Francisco wire routing number?

This page lists 121044055, the primary routing number registered to Bank of San Francisco. The record does not say whether the bank uses the same number for wire transfers, and many banks use a separate routing number for domestic wires. Confirm the wire routing number with Bank of San Francisco before sending a wire.

Is ABA number 121044055 the routing number for Bank of San Francisco?

Yes. ABA number 121044055 is the primary routing number registered to Bank of San Francisco. Check it against the routing number on a check or in your online banking before sending an ACH payment, because a bank can use different numbers by region or product.

Which bank uses routing number 121044055?

Routing number 121044055 belongs to Bank of San Francisco, headquartered in San Francisco, CA. It is the bank's primary ABA routing number (FDIC certificate 58069).

Routing numbers in San Francisco, CA

Bank: Bank of America California, N.A.: 121141822
Bank: BlackRock Institutional Trust Company, N.A.: 121045122
Credit union: San Francisco Federal Credit Union: 321076441
Credit union: San Francisco Fire Credit Union: 321076506
Bank: Bank of the Orient: 121029672
Credit union: The Police Credit Union of California: 321076496
Bank: Mission National Bank: 121038773
Bank: Beacon Business Bank, N.A.: 121040651

All routing numbers in California

View Bank of San Francisco's full profile →

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Regulator records: FDIC BankFind (cert 58069) · FFIEC NIC profile (RSSD 3357385)