Your member number is a unique identifier your bank assigns to you when you open an account
A member number is a code your bank uses to identify you as a customer. It is different from your account number — your account number identifies a specific account you hold, while your member number identifies you as a person or business at that bank. Some banks call it a customer number, client number, or cardholder number depending on the institution and the context.
Not all banks use the term "member number." Credit unions almost always do, because their customers are technically members of a cooperative. Traditional banks may use it, or they may simply refer to your customer ID or account number. The function is the same: it is how the bank's system recognizes you across all your accounts and services with them.
Your member number typically appears on statements, debit cards, checks, and in online banking portals. It is usually shorter than your account number — often 6 to 10 digits — and stays the same even if you open new accounts or close old ones at the same institution.
Key Takeaways
- A member number identifies you as a customer at a bank or credit union, separate from any individual account number.
- Credit unions use the term "member number" by default; traditional banks may call it a customer ID, client number, or account number.
- Your member number appears on statements, debit cards, and in online banking, and remains the same across all your accounts at that bank.
- You need your member number when calling customer service, disputing transactions, or setting up new services, because it links all your accounts and history to one identity.
- Your member number is not secret like a PIN or password, but you should not share it with strangers or on unsecured websites.
Where to find your member number
Your member number is printed on most documents your bank sends you. Check your monthly statement — it usually appears at the top or in a header section. If you have a debit card, the number may be printed on the front or back, though some banks do not print it there for security reasons.
Log into your online banking portal or mobile app. Your member number is almost always visible on the dashboard or account overview page, sometimes labeled as "Customer ID" or "Member ID." If you cannot find it there, look in the account settings or profile section.
Call your bank's customer service line. A representative can tell you your member number over the phone if you can verify your identity. You will need to provide your name, account number, and possibly other information like your Social Security number or a recent transaction amount.
Why banks and credit unions ask for your member number
When you call customer service, the representative uses your member number to pull up your entire profile at once. This includes all accounts you hold, your contact information, your transaction history, and any notes about previous issues or disputes. Providing your member number speeds up the process because the representative does not have to search for you by name alone — names are not unique, but member numbers are.
If you are disputing a transaction or reporting fraud, your member number connects that dispute to your identity and all your accounts. This is important because fraud on one account may signal a pattern across multiple accounts you hold at the same bank.
When you set up new services — a credit card, a loan, a savings account, or bill pay — your member number links the new service to your existing profile. The bank already knows your address, phone number, and credit history, so you do not have to repeat that information.
Member number versus account number: what is the difference
Your member number identifies you. Your account number identifies a specific account. If you have a checking account and a savings account at the same bank, you have one member number but two account numbers.
Account numbers are longer — usually 10 to 17 digits — and are printed on checks and statements next to the routing number. They are what you give to your employer for direct deposit or to a creditor for automatic payments. Member numbers are shorter and are used primarily for customer service and internal bank operations.
Some banks print both on your debit card. Others print only the account number. When you call customer service, providing either one usually works, but your member number is faster because it connects you to your entire relationship with the bank, not just one account.
Security: what you should and should not do with your member number
Your member number is not confidential like your PIN or password. Banks print it on statements and cards because it is not sensitive on its own. However, you should not volunteer it to strangers or type it into websites you do not trust.
If someone calls you claiming to be from your bank and asks for your member number, hang up and call your bank directly using the number on your statement or card. Scammers sometimes pose as bank representatives to gather information. Your bank already has your member number in their system — they will not need you to provide it to verify your identity.
Do not share your member number in emails or text messages, especially if someone initiated the contact. Legitimate banks communicate sensitive matters through secure online portals or phone calls you initiate.
What to do if you cannot remember your member number
If you have lost your statement or do not have access to online banking, the fastest way to find your member number is to call your bank's customer service line. Have your account number ready — it is printed on checks or on your debit card — and be prepared to verify your identity with your name, address, or Social Security number.
If you have a debit card, check both sides. Some banks print the member number in small text near the account number or in a corner of the card. If it is not there, the customer service call is your most direct option.
You can also visit a branch in person and ask a teller. Bring a photo ID and they will provide your member number immediately. This is useful if you prefer not to call or if you need the number urgently.
Member numbers at credit unions versus traditional banks
Credit unions almost always use the term "member number" because members own the credit union cooperatively, rather than being customers of a corporation. The member number functions the same way as a customer ID at a traditional bank — it identifies you as an individual member of that credit union.
Credit union member numbers are often shorter than those at large banks and may be printed more prominently on statements and cards. The process for finding or retrieving your member number is identical: check your statement, log into online banking, or call the credit union directly.
If you move money between a credit union and a traditional bank, you will use different member or customer numbers at each institution. They do not share customer databases, so your identity at one is completely separate from your identity at the other.
Frequently Asked Questions
Is my member number the same as my account number?
No. Your member number identifies you as a customer; your account number identifies a specific account. You have one member number but may have multiple account numbers if you hold several accounts at the same bank.
Can someone use my member number to access my account?
Not on its own. A member number is not a secret credential. To access your account, someone would also need your password, PIN, or other verification. However, do not share your member number with people you do not trust, especially if they also ask for other information.
What if my bank calls me and asks for my member number?
Hang up and call your bank back using the number on your statement or card. Legitimate banks have your member number already and will not ask you to provide it unsolicited. This is a common scam tactic.
Do I need my member number to make a payment or transfer money?
Usually not. For payments and transfers, you typically need the account number, routing number, or recipient's information. Your member number is mainly used for customer service calls, disputes, and setting up new services.
What should I do if I think someone has my member number and other personal information?
Call your bank immediately and describe what information may have been compromised. Your bank can monitor your accounts for suspicious activity and help you secure your accounts. If your password or PIN was also compromised, change it right away.