A checking account number has 10 to 12 digits, plus a separate routing number
Your account number is the string of digits that identifies your specific checking account at your bank. It typically runs 10 to 12 digits long, though the exact length varies by bank. This is different from your routing number, which is a nine-digit code that identifies the bank itself, not your account.
When you write a check or set up a direct deposit, you need both numbers. The routing number tells the payment system which bank to send money to; the account number tells that bank which account within the bank should receive it. Without both, the transaction will not go through.
You will find both numbers at the bottom left of your checks. The routing number comes first (nine digits), then your account number (10 to 12 digits). If you do not have checks, your bank statement or online banking portal will show both numbers.
Key Takeaways
- Your account number is 10 to 12 digits; your routing number is always 9 digits, and you need both for transfers and direct deposits.
- The routing number identifies your bank; the account number identifies your specific account within that bank.
- Both numbers appear at the bottom of your checks in order: routing number first, then account number.
- If you switch banks, your account number changes, but your routing number is tied to your new bank's system.
- Never share your full account number with anyone except your employer (for direct deposit) or a business you are paying directly.
Where to find your account and routing numbers
The easiest place to locate both numbers is the bottom of a check. Look at the left side of the bottom edge. You will see three groups of numbers separated by vertical lines. The first group (nine digits) is your routing number. The second group (10 to 12 digits) is your account number. The third group is the check number itself.
If you do not have checks or cannot read them clearly, log into your online banking account. Most banks display both numbers on the account overview or account details page. You can also call your bank's customer service line and ask them to read the numbers to you over the phone.
Your bank statement—whether printed or digital—will also show your routing and account numbers, usually near the top or in a summary section. Some banks print them on debit cards or in welcome materials sent when you open the account.
Why the length varies between banks
Different banks use different numbering systems, so account numbers are not all the same length. A bank might use 10 digits for one account type and 12 for another. Some credit unions use shorter numbers; some large national banks use longer ones. The variation does not affect how the account works—it is just how each bank's internal system is structured.
The routing number, by contrast, is always exactly nine digits. This is a federal standard set by the American Bankers Association. Every bank in the United States has one routing number (or sometimes more than one if the bank operates multiple processing centers).
What happens if you give out your account number
Your account number alone—without the routing number—is not enough for someone to drain your account. They would need both numbers plus authorization to move money. However, you should still treat your full account number as sensitive information.
It is safe to share your account and routing numbers with your employer (for direct deposit), with a business you are paying by check or bank transfer, or with your bank itself. Do not share them with people you do not know or on unsecured websites. If you suspect someone has your account number and you did not authorize it, contact your bank immediately.
Your debit card number is different from your account number. Your debit card has its own 16-digit number printed on the front. Thieves who steal your debit card number cannot access your checking account directly—they can only make purchases or withdraw cash using the card itself.
Account numbers when you switch banks
If you move your checking account to a new bank, you will receive a new account number. Your old account number stops working once the account is closed. This is why you need to update your direct deposit information with your employer and notify any businesses that pull money from your account automatically.
Your routing number will also change because it is tied to your new bank, not to you personally. Before you close your old account, make sure you have updated all recurring payments and direct deposits to use your new bank's routing number and your new account number.
Some banks allow you to keep an old account open for a grace period (usually 30 to 90 days) so that any stray payments still reach you. Ask your bank about this before closing the account.
How account numbers are used in different transactions
When you set up direct deposit, you provide your employer with your routing number and account number. The employer's payroll system uses these to send your paycheck directly to your bank, which then deposits it into your account.
If you pay a bill by check, the routing and account numbers at the bottom of the check tell the recipient's bank where to pull the money from. When you set up an automatic bill payment through your bank's website, you enter your account number so the bank knows which account to debit.
For wire transfers and ACH transfers (electronic transfers between banks), you provide both numbers to ensure the money goes to the right place. Without the correct routing number, the transfer may go to the wrong bank. Without the correct account number, it may go to the wrong person at the right bank.
Frequently Asked Questions
Can someone access my account with just my account number?
No. They would need your routing number as well, plus authorization to move money. Sharing your account number alone with a trusted business (like your employer) is generally safe. However, do not share it with strangers or on unsecured websites.
Is my account number the same as my debit card number?
No. Your debit card has a 16-digit number printed on the front. Your account number is 10 to 12 digits and appears at the bottom of your checks. They are separate identifiers for different purposes.
What if I forget my routing number?
Call your bank's customer service line or log into your online banking account. Both will show your routing number. You can also look at the bottom of a check if you have one. Your bank's website often lists the routing number in the help or contact section.
Do I need my account number to use my debit card?
No. You only need your debit card number, expiration date, and CVV to make purchases or withdraw cash. Your account number is used for direct deposits, bill payments, and transfers—not for everyday debit card use.
Will my account number change if I get a new debit card?
No. Your account number stays the same. Your debit card number changes when you get a new card, but the underlying checking account number does not. You only need to update direct deposits or automatic payments if you change banks, not if you get a new card.