Mechanics Bank Routing Number

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 Mechanics Bank routing number?

The Mechanics Bank routing number is 121102036. It is the primary ABA routing transit number registered to Mechanics Bank, headquartered in Walnut Creek, 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 Mechanics Bank wire routing number?

This page lists 121102036, the primary routing number registered to Mechanics Bank. 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 Mechanics Bank before sending a wire.

Is ABA number 121102036 the routing number for Mechanics Bank?

Yes. ABA number 121102036 is the primary routing number registered to Mechanics Bank. 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 121102036?

Routing number 121102036 belongs to Mechanics Bank, headquartered in Walnut Creek, CA. It is the bank's primary ABA routing number (FDIC certificate 1768).

Routing numbers of similar-size institutions in California

Bank, Walnut Creek, CA

United Business Bank: 121143781

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Pacific Coast Bankers' Bank: 121042484

Credit union, Walnut Creek, CA

Kaiperm Federal Credit Union: 321178446

Bank, Ontario, CA

Citizens Business Bank, N.A.: 122234149

Credit union, Sacramento, CA

The Golden 1 Credit Union: 321175261

Bank, Los Angeles, CA

Bank of Hope: 122041235

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Cathay Bank: 122203950

Credit union, San Jose, CA

First Technology Federal Credit Union: 321180379

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