Some banks and financial institutions usually have multiple routing numbers serving different purposes, geographical regions and branches. Most common types of transaction are ACH and wire transfers. They can also be found in the online banking portals of the financial institutions. It's also referred to as an RTN, a routing transit number or an ABA routing number and can be easily be found printed on the bottom of a check. You'll often be asked for your checking account routing number when you're making a payment online or by phone. A bank routing number or routing transit number (RTN, ABA) is a 9 digit number that identifies the location where your account was opened.
