Bank Routing Number

BlackRock Institutional Trust Company, N.A. Routing Number

The primary ABA routing number (RTN) for BlackRock Institutional Trust Company, N.A., San Francisco, CA is shown below.

Primary ABA / RTN

121045122

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 BlackRock Institutional Trust Company, N.A. routing number?

The BlackRock Institutional Trust Company, N.A. routing number is 121045122. It is the primary ABA routing transit number registered to BlackRock Institutional Trust Company, N.A., 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 BlackRock Institutional Trust Company, N.A. wire routing number?

This page lists 121045122, the primary routing number registered to BlackRock Institutional Trust Company, N.A. 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 BlackRock Institutional Trust Company, N.A. before sending a wire.

Is ABA number 121045122 the routing number for BlackRock Institutional Trust Company, N.A.?

Yes. ABA number 121045122 is the primary routing number registered to BlackRock Institutional Trust Company, N.A. 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 121045122?

Routing number 121045122 belongs to BlackRock Institutional Trust Company, N.A., headquartered in San Francisco, CA. It is the bank's primary ABA routing number.

Routing numbers in San Francisco, CA

Bank: Bank of America California, N.A.: 121141822
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: Bank of San Francisco: 121044055
Bank: Mission National Bank: 121038773
Bank: Beacon Business Bank, N.A.: 121040651

All routing numbers in California

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Regulator records: FFIEC NIC profile (RSSD 1444021)