Where can I find my checking account number? Your checking account number can be found in your online or mobile banking app, usually under account information. It also can be found on your monthly statements and at the bottom of one of your checks to the right of the routing number. In fact, the digits at the bottom of your check tell you, from left to right, your bank or credit union’s routing number, then your account number, and finally your check number. Your checking account number is a different number than what appears on your debit card. The length of your checking account number is typically 10-14 digits long and is unique to you. The routing number is unique to your bank or credit union.