Bank account numbers in the United States contain only digits, no letters

A U.S. bank account number is made up entirely of numbers. It will never include letters, spaces, hyphens, or any other characters. The length varies by bank — most account numbers run between 8 and 17 digits — but every single character is a numeral from 0 to 9.

If you see letters attached to what looks like an account number, you are looking at something else: a reference code, a transaction ID, a customer ID, or possibly an account type designation that your bank added for its own tracking. The actual account number itself is digits only.

This matters because when you are setting up a wire transfer, direct deposit, or automatic payment, you need to enter the account number exactly as it appears on your bank statement or check. If you accidentally type a letter where a digit should be, the transaction will either be rejected outright or sent to the wrong account.

Key Takeaways

  • U.S. bank account numbers contain only the digits 0 through 9, with no letters or special characters.
  • Account numbers typically range from 8 to 17 digits depending on the bank, but the exact length varies.
  • If you see letters next to an account number, they are usually a separate code — like a reference number or account type indicator — not part of the account number itself.
  • When entering your account number for transfers or payments, use only the digits and match them exactly to avoid sending money to the wrong place.

Where to find your account number and what else is on your check

Your account number appears on the bottom left of every check you receive from your bank. It sits between two sets of numbers: the routing number on the far left and the check number on the far right. All three are printed in a special magnetic ink that machines can read.

Your bank statement — whether you get it by mail or view it online — also displays your account number. Online banking portals typically show it in your account details or settings. If you need it and cannot find it, call your bank's customer service line or visit a branch with your ID.

The routing number (the first set of digits on your check) is a nine-digit code that identifies your specific bank or credit union. The account number (the middle set) identifies you within that bank. The check number (on the right) is just a sequential counter for that particular check. None of these contain letters.

Why some banks display account information with letters or codes

Banks sometimes print letters or alphanumeric codes on statements or online portals next to your account number. These are not part of the account number itself — they are labels the bank uses internally. Common examples include account type codes (like "CHK" for checking or "SAV" for savings), branch codes, or customer reference numbers.

When you see something like "Account: 123456789-A" on a statement, the "A" is a designation added by your bank, not a digit you need to include when you give your account number to someone else. If you are unsure which part is the actual account number, look at your check or call your bank to confirm.

International account numbers work differently — many countries use IBAN (International Bank Account Number) formats that do include letters — but within the U.S. banking system, account numbers are numeric only.

What happens if you enter letters or wrong digits

If you type letters into an account number field during a wire transfer or direct deposit setup, most systems will reject the entry immediately and ask you to correct it. The form will not accept non-numeric characters in that field.

If you enter the wrong digits, the transaction may still process — it will simply go to a different account at the same bank, or to a different bank entirely if the routing number is also wrong. The money does not bounce back automatically. Recovery depends on whether the receiving bank or account holder cooperates, which can take weeks or may not happen at all.

Always double-check your account number before confirming any transfer. Copy it directly from your check or statement rather than typing it from memory. If you are sending money to someone else's account, ask them to read it back to you digit by digit.

Account numbers for different account types

Checking accounts, savings accounts, and money market accounts all have account numbers that are digits only. If you have multiple accounts at the same bank, each one has its own unique numeric account number. The account type (checking, savings, etc.) is separate information that your bank tracks, but it is not part of the account number itself.

Some banks assign different account numbers to the same person for different purposes — for example, one number for a personal checking account and another for a business account. Each is a standalone numeric identifier. When you set up direct deposit or automatic payments, you need the account number for the specific account where you want the money to go.

How account numbers differ from other banking identifiers

Your account number is not the same as your customer ID, which is a separate identifier your bank uses to track you as a customer across all your accounts. Your customer ID might be alphanumeric (containing letters and numbers), but your account number is not.

Your Social Security number is also not your account number — banks use SSN for tax reporting and identity verification, but it is stored separately from your account number. Your PIN (personal identification number) is numeric but is not your account number either; it is a security code you use to access your account at ATMs or online.

When someone asks for your account number, they are asking for the numeric identifier printed on your check or statement. Do not confuse it with your customer ID, SSN, PIN, or any other code your bank has assigned you.

Frequently Asked Questions

Can I use my account number to identify myself to my bank?

Your account number alone is not enough to prove your identity. Banks require additional verification like your Social Security number, date of birth, or answers to security questions. Your account number is public information (it is printed on every check you write), so it cannot serve as a security identifier by itself.

What if my bank statement shows letters next to my account number?

Those letters are a bank designation, not part of your actual account number. When you provide your account number for a wire transfer or direct deposit, use only the digits. If you are unsure which digits are the account number, call your bank or check your check.

Do international transfers use the same account number format?

No. International transfers typically use IBAN (International Bank Account Number) or SWIFT codes, which do include letters. But within the U.S., account numbers are numeric only. If you are sending money internationally, your bank will tell you which format to use.

Is my account number the same as my routing number?

No. Your routing number (nine digits) identifies your bank. Your account number (typically 8 to 17 digits) identifies your specific account within that bank. Both are printed on your check, but they are separate numbers used for different purposes.

What should I do if I accidentally gave someone the wrong account number?

Contact your bank immediately and explain the situation. If money has already been sent, the bank can attempt to recover it, but success depends on the receiving bank and account holder. Prevention is easier than recovery, so always verify account numbers before confirming transfers.