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Why is routing number called ABA/ABN number?
The ABA number you speak of is more accurately called the Routing Transit Number.   http://en.wikipedia.org/wiki/Routing_transit_number A routing transit number (RTN) is a nine digit bank code, used in the   United States, which appears on the bottom of negotiable instruments   such as checks identifying the financial institution on which it was   drawn. This code was designed to facilitate the sorting, bundling, and   shipment of paper checks back to the drawer's (check writer's)   account. The RTN is also used by Federal Reserve Banks to process Fedwire funds   transfers, and by the Automated Clearing House to process direct   deposits, bill payments, and other such automated transfers. The RTN number is derived from the bank's transit number originated by   the American Bankers Association, which designed it in 1910.[1] I am going to assume that the euphemistic ABA Number has been shortened by whoever told you about it and called it the ABN.  Perhaps American Bank Number.  Either way, the technical term is RTN. Perhaps a comment or editor can straighten me out about the ABN. There is an international number known as the SWIFT number that serves the same purpose worldwide. http://en.wikipedia.org/wiki/ISO_9362 ISO 9362 (also known as SWIFT-BIC, BIC code, SWIFT ID or SWIFT code)   defines a standard format of Business Identifier Codes approved by the   International Organization for Standardization (ISO). It is a unique   identification code for both financial and non-financial   institutions.[1] The acronym SWIFT stands for the Society for   Worldwide Interbank Financial Telecommunication. When assigned to a   non-financial institution, the code may also be known as a Business   Entity Identifier or BEI. These codes are used when transferring money   between banks, particularly for international wire transfers, and also   for the exchange of other messages between banks. The codes can   sometimes be found on account statements.