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What is a routing number?

Quick Answer

A routing number (ABA number) is a 9-digit code identifying a specific US bank or financial institution in electronic transfers. Found on the bottom-left of checks or in your bank's online portal.

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Warren Team
Updated January 26, 2026
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The information provided is for educational purposes only and should not be considered as personalized financial advice. Warren is a registered investment advisor. Past performance does not guarantee future results. Please consult with a qualified financial advisor before making investment decisions.

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