The Evolution of the Routing Number Although routing numbers have evolved over the years to account for changes in the industry including the development of the Federal Reserve System, the advent ...

A routing number is a nine-digit code that identifies a U.S. federal or state-chartered bank. Routing numbers help banks, merchants and consumers ensure financial transactions are accurately ...

The American Bankers Association routing number is a nine-digit numerical code used to identify a bank. Banks use ABA routing numbers to process checks and electronic transfers of funds between banks.

Most routing vendors today have based at least part of their routing code on software known as " GateD," which was developed in the late 1980s at the University of Michigan.