Union Bank Routing Number: US Bank Transition Guide

What is the Union Bank routing number?

MUFG Union Bank used routing number 122000496 for its accounts, primarily serving customers in California, Oregon, and Washington. Union Bank was a subsidiary of Mitsubishi UFJ Financial Group (MUFG), one of the largest financial institutions in the world.

In December 2022, US Bank completed its acquisition of MUFG Union Bank's core consumer and business banking operations. The $8 billion deal transferred approximately 1 million customer accounts and nearly 190 branch locations to US Bank.

US Bank merger and routing number changes

US Bank converted former Union Bank branches and customer accounts throughout 2023. Customers received new US Bank routing and account numbers as part of the integration. The legacy Union Bank routing number 122000496 is being phased out.

US Bank uses state-specific routing numbers. Former Union Bank customers in California were typically assigned routing number 122235821, though your specific number may differ. Always verify through US Bank directly rather than relying on the old Union Bank number.

How to find your current routing number

Log into the US Bank mobile app or usbank.com to view your current routing and account numbers. Your routing number is available in the account details section of the online banking portal.

You can also find your routing number on US Bank checks, by calling US Bank at 1-800-872-2657, or by visiting a branch. If your account has not yet been fully converted, contact US Bank customer service for guidance.

Updating payments and direct deposits

Update all direct deposit instructions, automatic bill payments, and recurring transfers with your new US Bank routing and account numbers. The old Union Bank routing number may stop working as the transition is finalized.

Wire transfers require particular attention, as US Bank may use a separate wire routing number. Confirm both your ACH and wire transfer routing numbers before sending or receiving wires through your converted account.

Modern business banking with Slash

Bank mergers mean disrupted payment flows and reconfigured accounts. Slash offers businesses a modern banking platform with stable routing numbers, instant virtual cards, full ACH and wire capabilities, and automated expense management — no merger headaches required.

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