on a check what is routing number and what is bank account number
1 It's the first set of numbers printed on the bottom of your checks, on the left side. You can also find it in the U.S. Bank routing number chart below.  Your account number (usually 10-12 digits) is specific to your personal account. It's the second set of numbers printed on the bottom of your checks, just to the right of the bank routing number. You can also find your account number on your monthly statement.