A member number is a unique identifier your bank assigns to your account that lets them pull up your information in their system
When you open a bank account, the bank creates a member number — sometimes called a customer number, account number, or reference number depending on the bank. This is different from your account number. Your account number identifies the specific account (checking, savings, money market). Your member number identifies you as a person or business in the bank's database. The bank uses it to connect all your accounts, your contact details, your loan history, and your transaction records to one profile.
You will see your member number on statements, in online banking, and on documents the bank sends you. It is typically a string of numbers, sometimes with letters. The exact format and length vary by bank — some use six digits, others use eight or more. You do not need to memorize it, but you should know where to find it if the bank asks for it during a phone call or when you are setting up online access.
Key Takeaways
- Your member number is separate from your account number and identifies you in the bank's system, not a specific account.
- You can find your member number on your bank statement, in your online banking portal, or by calling your bank's customer service line.
- The bank uses your member number to link all your accounts and services together under one customer profile.
- You may need to provide your member number when you call the bank, set up online banking, or authorize someone else to access your account.
- Your member number stays the same even if you close an account or change account types at the same bank.
Where to find your member number
The easiest place to look is your bank statement — paper or digital. Your member number usually appears in the top right corner or near your account number, often labeled as "Member ID," "Customer Number," or "Reference Number." If you have online banking set up, log in and check your account dashboard or profile settings. Most banks display it prominently on the home page or under account information.
If you cannot find it on a statement or online, call your bank's customer service number on the back of your debit card or on the bank's website. Have your account number and a form of ID ready. The representative can tell you your member number in seconds. Some banks also print it on your debit card itself, though not all do.
Why the bank needs a member number
Banks use member numbers to organize their customer database. When you have multiple accounts at the same bank — a checking account, a savings account, a credit card, a loan — the member number ties them all together. This makes it faster for the bank to pull up your full financial picture when you call or visit a branch. It also helps the bank track your history with them, including any past disputes, fraud claims, or account closures.
The member number also protects you. If someone calls the bank pretending to be you, the bank can verify your identity by asking for your member number along with other information like your Social Security number or the last four digits of your account number. This is a standard security check. The member number alone is not enough to access your account, but it is part of the verification process.
Member number versus account number
These two numbers serve different purposes and it is easy to confuse them. Your account number identifies a specific account — your checking account, your savings account, or your money market account. Your member number identifies you as a customer. If you have three accounts at the same bank, you have one member number and three account numbers.
When you set up direct deposit or automatic bill payments, you typically provide your account number and routing number, not your member number. When you call the bank for customer service, they may ask for your member number to pull up your profile, then ask which account you want to discuss. Understanding the difference helps you give the bank the right information the first time.
Using your member number for online banking and transfers
When you set up online banking, the bank may ask for your member number during registration. This helps them confirm that you are the account holder and link your login to the correct customer profile. Some banks use your member number as part of your username or login process, though most now use email addresses or custom usernames instead.
If you are transferring money between your own accounts at the same bank, you may see your member number displayed in the transfer screen. This is normal — it confirms that both accounts belong to you. You do not need to type it in; the bank's system handles it automatically once you select the accounts you want to transfer between.
What happens to your member number if you close an account
Your member number stays active as long as you have at least one account open at the bank. If you close all your accounts and leave the bank entirely, the bank may deactivate your member number after a certain period — usually 90 days to a year, depending on the bank's policy. If you return and open a new account later, the bank may assign you a new member number or reactivate your old one.
If you close one account but keep others open at the same bank, your member number does not change. The closed account simply disappears from your profile, but your member number continues to link your remaining accounts together.
Member numbers and fraud protection
Your member number is not sensitive information in the way your Social Security number or account password is. Banks print it on statements that go in the mail and display it in online banking. However, you should still treat it as private. If someone has your member number along with other personal information — your name, address, phone number, or account number — they could potentially call the bank and attempt to impersonate you.
The bank will not give anyone access to your account based on a member number alone. They will ask for additional verification, such as your Social Security number, date of birth, or answers to security questions you set up when you opened the account. If you suspect fraud or unauthorized access, contact your bank immediately using the number on the back of your debit card or on the bank's official website.
Frequently Asked Questions
Is my member number the same as my routing number?
No. Your routing number identifies the specific bank branch or banking network, and it is the same for all customers at that bank. Your member number identifies you as an individual customer. You need both the routing number and your account number to set up direct deposit or wire transfers, but you do not typically need your member number for those transactions.
Can I use my member number to log into online banking?
Some banks allow you to use your member number as part of your login, but most have moved to email addresses or custom usernames. Check your bank's online banking login page to see what information they accept. If you forget your login, you can usually reset it using your email address or by calling customer service.
What if I do not know my member number and need it right away?
Call your bank's customer service line on the back of your debit card or on their website. Have your account number and a form of ID ready. The representative can provide your member number in less than a minute. You can also visit a branch in person with your ID and ask a teller to look it up.
Does my member number change if I move to a different branch?
No. Your member number stays the same no matter which branch you visit or which location processes your transactions. It is tied to you as a customer, not to a physical location. This is one reason the member number is useful — it keeps your profile consistent across the entire bank network.
Can someone access my account if they know my member number?
Not without additional information. Your member number alone is not enough to access your account or move money. The bank requires multiple forms of verification, such as your password, security questions, or a one-time code sent to your phone. Treat your member number as private, but know that it is not the key to your account by itself.