Routing transit number

Common card · No. 337325

In the United States, an ABA routing transit number (ABA RTN) is a nine-digit code printed on the bottom of checks to identify the financial institution on which it was drawn. The American Bankers Association (ABA) developed the system in 1910 to facilitate the sorting, bundling, and delivering of paper checks to the drawer's (check writer's) bank for debit to the drawer's account. Newer electronic payment methods continue to rely on ABA RTNs to identify the paying bank or other financial institution. Federal Reserve payment services use routing numbers to identify participants in Fedwire Funds Service, Fedwire Securities Service, and FedACH transactions.

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