A bank account number is a unique identifier assigned to a specific bank account. Account numbers can vary in length and format depending on the institution or service. For financial transactions, your account number is like your fingerprint, identifying who you are for transactions and account updates. You can find your account number at the bottom of a paper check (typically the second set of numbers), or by logging into your bank's online portal or mobile app.

Globally, 79% of adults had an account at a bank or regulated institution in 2025, according to the World Bank. This guide will cover what businesses should know about account numbers, including what they are, how they work, and why they matter.

What’s in this article?

• How are bank account numbers used?
  
• How to find your account number
  
• How to keep your bank account number safe
  
• Difference between a routing number and an account number
  
• How Stripe Payments can help
  

How are bank account numbers used?

Bank account numbers identify individual accounts within a bank or financial institution. These numbers are typically between 8 and 12 digits in the US, but they can reach up to 17 digits and can vary in length or format internationally. Bank account numbers are used in financial transactions to ensure that funds are added to or removed from the appropriate account.

Account numbers are used to facilitate deposits, withdrawals, electronic funds transfers (EFTs), direct deposits, wire transfers, and automatic billing. Account numbers are also used for account management, allowing customers and bank staff to access account information, balances, and transaction history.

When you’ll be asked for your bank account number

You’ll be asked to provide your bank account number when setting up automatic bill payments or direct deposit to your bank account. Bank account numbers are also generally required for wire transfers and for linking a bank account to a payment app.

Bank account numbers make it possible to send and accept Automated Clearing House (ACH) payments between clients, employees, and vendors. Bank account numbers are also required for many other types of recurring payments.

How to find your account number

• Bank statements: Both paper and electronic bank statements should include the bank account number. Look for a section labeled “account details” or at the top of the document where the account holder’s information is listed.

• Checks: If you have a checkbook, the account number is typically printed on the bottom of each check. It is the second set of numbers between the routing number and the check number. If the second and third numbers are reversed, the longer number is typically your account number.

• Online banking: Account numbers are listed on online banking accounts, accessible via website or mobile app. They’re typically listed under “account details,” “account summary,” or “profile settings.”

• Bank cards: In some cases, the account number may be printed on debit cards issued by your bank. However, debit cards usually have a card number that differs from the account number.

• Bank branch or customer service: If you cannot find your account number through the methods listed above, visit your bank’s local branch or contact their customer service. They can verify your identity and provide your account number.

How to keep your bank account number safe

Sharing your bank account number is a normal part of many financial interactions. For example, you might provide your account number to your employer for direct deposit, share it with a secure institution to set up automatic bill payments, or give it to a trusted person or business to initiate a legitimate bank transfer.

However, you should avoid sharing your bank account number in response to unexpected or unrecognized requests, whether via phone, email, or text. These tactics are often used in phishing and fraud schemes, and no reputable bank or government agency will ask for your account details this way.

If you’re concerned that your bank account number has been compromised, contact your bank immediately to flag any unauthorized transactions, request a new account number if needed, and monitor your statements closely in the weeks that follow.

Difference between a routing number and an account number

What is a routing number?

A routing number is a nine-digit code used to identify a specific financial institution or bank branch within the United States. It is also known as an American Bankers Association (ABA) routing number.

Routing numbers clarify the bank and branch involved in financial transactions such as direct deposits, wire transfers, checks, and Automated Clearing House (ACH) transfers. A single bank can have multiple routing numbers, depending on its size, location, and specific services.

What is an account number?

An account number is a unique identifier assigned to a specific account within a financial institution. It distinguishes one account from another within the same bank or branch. Account numbers vary in length and format, depending on the bank or institution.

Account numbers are used to track and manage individual accounts. In financial transactions such as funds transfers, account numbers identify the specific account to which or from which funds should be transferred. While the routing number identifies the financial institution, the account number identifies the specific account within that institution. Financial transactions often require both numbers to transfer funds correctly.

Bank account number vs. debit card number

Your bank account number identifies the account where your money is held. This number is used for transactions such as direct deposits and bank transfers. Your debit card number is tied to a separate payment card system that draws from that same bank account, but is generally used for making purchases. The two are different identifiers and are not interchangeable—knowing one does not give you access to the functions of the other.

How Stripe Payments can help

Stripe Payments provides a unified, global payments solution that helps any business—from scaling startups to global enterprises—accept payments online, in person, and around the world.

Stripe Payments can help you:

• Optimize your checkout experience: Create a frictionless customer experience and save thousands of engineering hours with prebuilt payment UIs, access to 125+ payment methods, and Link, a wallet built by Stripe.
  
• Expand to new markets faster: Reach customers worldwide and reduce the complexity and cost of multicurrency management with cross-border payment options, available in 195 countries across 135+ currencies.
  
• Unify payments in person and online: Build a unified commerce experience across online and in-person channels to personalize interactions, reward loyalty, and grow revenue.
  
• Improve payments performance: Increase revenue with a range of customizable, easy-to-configure payment tools, including no-code fraud protection and advanced capabilities to improve authorization rates.
  
• Move faster with a flexible, reliable platform for growth: Build on a platform designed to scale with you, with 99.999% historical uptime and industry-leading reliability.
  

Learn more about how Stripe Payments can power your online and in-person payments, or get started today.