What is the routing number on a check?
The routing number is derived from a bank’s transit number.The routing transit number (RTN), is a nine digit bank code which appears at the bottom of a check to identify the financial institution on which it was drawn. The transit number is originated by the American Banker’s Association (ABA). There are approximately 28,000 active routing and transit numbers in use. For more information see here: http://www.aba.com/Products/PS98_Routing.