Your checking account has two main numbers: the account number and the routing number

A checking account uses two separate numbers to identify where your money is and how to send it there. The account number is unique to your specific account at your bank—it's usually 8 to 12 digits long, though this varies by bank. The routing number is a nine-digit code that identifies your bank itself, not your account. Together, these two numbers let other banks, employers, and payment services find your account and move money in or out.

You'll see both numbers printed at the bottom left of your checks, in a specific order: the routing number comes first (in the first set of boxes), then the account number (in the second set of boxes). If you don't have checks, you can find both numbers by logging into your online banking, calling your bank's customer service line, or visiting a branch in person.

Key Takeaways

  • Your account number is typically 8 to 12 digits and identifies your specific account; the routing number is always 9 digits and identifies your bank.
  • Both numbers appear on the bottom of your checks in order: routing number first, then account number.
  • You need both numbers to set up direct deposit, arrange wire transfers, or authorize automatic payments.
  • The routing number stays the same for all customers at your bank, but your account number is unique to you alone.
  • If your bank merges with another bank, your routing number may change, but your account number usually stays the same.

Where to find these numbers if you don't have checks

If you haven't ordered checks yet or your checks are at home, you have several quick ways to locate both numbers. Log into your online banking portal—most banks display the account number on the account summary page or in account settings. The routing number is usually listed in the same place, often labeled as "ABA routing number" or "bank routing number."

You can also call your bank's customer service number (usually on the back of your debit card) and ask for both numbers. A representative can read them to you over the phone in under a minute. If you're at a branch, any teller can write down both numbers for you on a piece of paper. Some banks also print these numbers on your debit card itself, though not all do.

Why you need both numbers and what they're used for

Employers use your routing number and account number together to set up direct deposit of your paycheck. Insurance companies, government agencies, and benefits programs use them the same way to deposit refunds or payments. If you're sending money out—through a bill payment service, a wire transfer, or a peer-to-peer payment app—you'll typically need to provide your account number at minimum, and sometimes both numbers.

The routing number tells the sending bank which bank to contact. The account number tells that bank which specific account within their system should receive the money. Without both pieces of information, the transfer can't happen or can end up in the wrong account. This is why banks ask for both when you're setting up a new payment method.

Account number length varies by bank

Most banks use account numbers between 8 and 12 digits long. Some use 10 digits as a standard; others use 9 or 11. There's no single rule across all banks—each institution decides its own numbering system. This means you can't predict your account number's length just by knowing which bank you use.

The routing number, by contrast, is always exactly 9 digits. This is a federal standard set by the American Bankers Association. So if you see a 9-digit number at the bottom of your check, that's your routing number. If you see a longer number, that's your account number.

What happens if you give out your account number

Giving your account number to a trusted organization—your employer, your bank, a government agency processing a refund—is safe and necessary. These entities need it to deposit money into your account. The account number alone, without your routing number, is less useful to someone trying to commit fraud, because they still don't know which bank to contact.

However, you should never share your account number with someone who contacts you unexpectedly by phone, email, or text claiming to represent your bank or a government agency. Legitimate banks and government offices will never ask you to confirm your account number this way. If you're unsure whether a request is real, hang up and call your bank directly using the number on your debit card or bank statement.

Changes to your numbers when banks merge

If your bank merges with another bank or is acquired, your account number usually stays the same. Your routing number, however, may change to reflect the new bank's routing code. The bank will notify you of any routing number change and will typically update it automatically in systems where you've set up direct deposit or automatic payments.

If you have checks printed with your old routing number, they may still work for a period of time after the merger, but you should order new checks with the updated routing number to avoid delays. Your bank will send you information about the merger and any changes you need to make, usually several weeks before the change takes effect.

How these numbers differ from other account identifiers

Your checking account may have other numbers associated with it that serve different purposes. Your debit card number is separate from your account number—it's a payment card number used for purchases and ATM withdrawals. Your bank may also assign you a customer ID number for their records, which is different from your account number. Some banks use a branch number as part of their internal system, but this is not the same as your routing number.

When someone asks for your account number, they mean the number that identifies your checking account specifically. When they ask for your routing number, they mean the nine-digit code for your bank. Don't confuse these with your debit card number, your Social Security number, or any other identifier your bank uses.

Frequently Asked Questions

Can someone steal money from my account if they only have my account number?

Having only your account number is not enough to transfer money out of your account. A thief would also need your routing number to know which bank to contact, and even then, most banks require additional verification before processing transfers. However, you should still treat your account number as sensitive information and only share it with organizations you trust.

What's the difference between my account number and my debit card number?

Your account number identifies your checking account at the bank. Your debit card number is a separate payment card number printed on your card, used for purchases and ATM withdrawals. They are not the same, and you should not use your debit card number when someone asks for your account number.

Do I need both numbers to set up direct deposit?

Most employers ask for your routing number and account number when setting up direct deposit. Some may only ask for your account number if they already have your bank information on file. It's safest to provide both numbers when asked, as this ensures the deposit goes to the correct account.

Will my account number change if I move to a different branch of the same bank?

No. Your account number stays the same no matter which branch you visit or which location processes your transactions. The account number is tied to your account, not to a physical location. Your routing number also stays the same, as it identifies the bank itself, not individual branches.

Where exactly are these numbers on my check?

At the bottom left of your check, you'll see two groups of numbers separated by a colon or vertical line. The first group (9 digits) is your routing number. The second group (typically 8 to 12 digits) is your account number. A third number at the far right is your check number, which identifies that specific check.