Your account number is the second set of digits at the bottom of the check

The bottom of a check contains three separate number sequences, printed in magnetic ink. From left to right, they are: your bank's routing number, your account number, and the check number. Your account number is always in the middle. It typically runs 8 to 12 digits long, though the exact length depends on your bank.

The account number identifies your specific account within your bank's system. When someone deposits or cashes your check, the routing number tells the banking system which bank to send the money to, and the account number tells that bank which account within their system should receive it. Without the account number, the routing number alone is not enough to process the payment.

These three numbers are printed in a special format called MICR (Magnetic Ink Character Recognition), which allows check-processing machines to read them automatically. The numbers are always in the same order and position on every check from your account.

Key Takeaways

  • Your account number is the middle set of digits printed at the bottom of your check, between the routing number on the left and the check number on the right.
  • Account numbers are typically 8 to 12 digits long, but the exact length varies by bank.
  • The account number identifies which specific account within your bank should receive funds when a check is deposited.
  • All checks from the same account will have the same account number printed on them.

How the three numbers work together

A check's bottom line is a complete instruction set for moving money. The routing number (leftmost) directs the check to the correct bank or credit union. The account number (middle) directs it to the correct account within that bank. The check number (rightmost) is straightforward a reference number you use to track which check this is in your own records.

When you write a check, you are authorizing your bank to pull money from the account identified by that account number. If someone else receives your check, they see all three numbers. This is why your account number is not secret in the same way a password is — anyone who has one of your checks can see it. However, a check number alone cannot be used to withdraw money without the routing number, and neither number alone is enough to process a payment.

Finding your account number if you do not have a check

If you need your account number but do not have a check in front of you, your bank provides it in several places. Log into your online banking portal — your account number usually appears on the account summary or dashboard page. You can also call your bank's customer service line and ask; they will verify your identity and read it to you over the phone.

Your bank statement (whether paper or electronic) also lists your account number, usually near the top. Some banks print it on your debit card or ATM card, though not all do. The fastest route is usually your online banking portal, which you can access from any device with internet access.

Why banks print account numbers on checks

Checks predate computers by decades. When checks were the primary way to move money between accounts, printing the account number on every check made sense — it was the only way the banking system could process them at scale. Machines could read the magnetic ink numbers faster and more accurately than humans could read handwriting.

Today, checks are far less common, but the system has not changed. Your bank still prints your account number on every check because the infrastructure that processes checks still relies on it. Even though most payments now happen electronically, checks are still used often enough that banks continue to print them this way.

What information is safe to share from a check

Your routing number and account number are not secrets. Anyone who receives a check from you will see both numbers. You can safely share these numbers with employers (for direct deposit), with service providers (to set up automatic payments), or with anyone else who needs to send you money or withdraw an authorized payment from your account.

What you should not share is a blank check itself, or a photo of a check that shows all the information together. A blank check in someone else's hands is a tool they could use to write unauthorized checks from your account. The routing and account numbers alone are not enough to do this — they need a physical check or the ability to create one — but there is no reason to hand someone a blank check when they only need the numbers.

Reading the numbers correctly

The three number sequences at the bottom of a check are always printed in the same order and position. Look at the bottom left corner first: that is your routing number. In the middle: your account number. On the bottom right: your check number. The numbers are printed in a distinctive font that machines can read, and they are always in black or dark blue magnetic ink.

If you are reading a check for the first time, the middle sequence is what you need. Count the digits — most account numbers are 8 to 12 digits long, though some banks use different lengths. If you are unsure which number is which, your bank's website or a customer service representative can walk you through it.

Frequently Asked Questions

Is my account number the same on every check I have?

Yes. Every check from the same account will have the same account number printed on it. The only number that changes is the check number, which increments with each new check in your checkbook.

Can someone withdraw money from my account if they have my account number and routing number?

Not with just those two numbers. They would also need authorization from you or a valid legal order. However, do not share these numbers with people you do not trust. If someone has both numbers and a physical check, they could potentially write unauthorized checks from your account.

What if the numbers at the bottom of my check are hard to read?

Contact your bank and ask them to read the numbers to you over the phone, or log into your online banking account to find them there. If your checks are damaged or the printing is faded, you can order new checks from your bank.

Are the numbers at the bottom of a check in a different order on different banks' checks?

No. The order is always the same: routing number, account number, check number, from left to right. This is a standard set by the banking system, not something individual banks change.