Routing number vs account number on a check: How to tell them apart

Setting up a direct deposit or an ACH transfer means you'll need 2 key numbers from your bank: your routing number and your account number.

Whether you're starting a new job or paying a bill online, getting these digits right is essential. A single mistyped number can lead to delayed payments or money being sent to the wrong destination. While digital banking has reduced the need for paper checks, the logic behind these numbers remains at the core of the US financial system.

Both appear on a paper check, but knowing which is which can be confusing. We clear it up in this guide.

Want to learn how money moves between accounts? Explore our guide to ACH transfers.

What is the difference between a routing number and an account number?

The simplest way to think about the routing number vs account number on a check is to view them as parts of a physical address. The routing number identifies the building (the bank), while the account number identifies the apartment (your specific account).

The routing number is a public code. Every customer at the same branch of a specific bank will generally share the same routing number. It tells the financial system where to send the money. In contrast, your account number is private and unique to you. Even if you have multiple accounts at the same bank, like a checking and a savings account, each will have its own distinct account number.

At Revolut, we believe in making these details easy to access. Instead of hunting through a drawer for a checkbook, you can find your details in a few taps in-app.

How to read a check: The anatomy of your banking details

When you look at the bottom of a US check, you'll see a string of numbers printed in a special font. This is known as the Magnetic Ink Character Recognition (MICR) line. This technology allows bank sorting machines to read the data quickly.

The routing number

This is almost always the first set of numbers on the bottom left. It's exactly 9 digits long and is flanked by a specific character symbol that looks like a vertical bar with 2 dots.

The account number

The second set of numbers is your account number. It usually sits in the middle of the bottom row. Unlike the routing number, the length can vary. Most US account numbers are between 8–12 digits long.

The check number

The final set of numbers on the bottom right (or sometimes the top right) is the check number. This is a short sequence used for your own record-keeping. It helps you track which checks have been cashed and which are still outstanding.

Understanding the routing number

The routing number is the primary gateway for your money. Without it, the Federal Reserve wouldn't know which institution is responsible for receiving or sending your money.

What is an ABA number?

You may hear people refer to the routing number as an ABA number. This stands for the American Bankers Association, the body that created the system in 1910 to make check processing more efficient.

An ABA number is a specific type of routing transit number (RTN) used in the US. If you're wiring money from the US, you'll likely need this number to ensure the domestic leg of the journey is handled correctly.

How routing numbers are assigned

The 9 digits in a routing number aren't random. The first 4 digits identify the Federal Reserve district where the bank is located. The next 4 digits represent the specific bank itself. The final digit is a check digit used by computers to verify that the previous 8 digits were entered or scanned correctly.

You can verify any routing number through the American Bankers Association's official directory.

Understanding the account number

While the routing number gets the money to the right bank, the account number ensures it lands in your account.

Your unique financial identifier

Your account number is assigned by your financial institution when you open an account. It's essentially your ID within that bank's internal ledger. Because this number provides direct access to your money, you should treat it with the same level of care as a password or a PIN.

If you have a Revolut account, your account number is what identifies you for all incoming transfers, whether they're local payments or international money transfers.

Learn more about sending and receiving money with Revolut.

When will you need these numbers?

You'll need both your routing and account numbers for several common financial tasks. It's helpful to have them saved in a secure place so you don't have to search for a check every time you need them.

Setting up direct deposits

Most employers in the US pay their employees via direct deposit. To get paid, you'll need to provide your payroll department with both numbers. This ensures your salary moves from the company's bank to yours automatically on payday.

Making ACH and wire transfers

When you pay a utility bill or send money to a friend, you're most likely using the Automated Clearing House (ACH) network. These transfers are processed in batches and are the standard for everyday banking.

Wire transfers, on the other hand, are designed for speed and large amounts. Understanding the difference can help you choose the right method for your payment. For both, you'll need the routing and account details of the recipient.

Learn more about the difference between a wire transfer vs bank transfer.

How to find your routing and account numbers without a check

If you don't use paper checks, you can still find your details easily. Most modern banks provide this information through their digital platforms. Here's where you can find it:

Mobile app: Log in to your banking app. Most providers list the account and routing numbers under "Account Details" or "Settings".

Online banking: Sign in via a web browser. Look for a "Details" or "Information" button near your account balance.

Bank statements: Your monthly statement, whether paper or PDF, will usually include your account number, though the routing number may sometimes be omitted.

Customer support: You can call your bank or visit a branch with your ID to request these details.

At Revolut, we make this even simpler. Your details are clearly displayed on your account's home screen, so you're always ready to share them when you need to.

Security: How to protect your banking information

Because your account number and routing number can be used to withdraw money (via ACH debits), thinking about security is important. Here's what you should consider:

• Don't share details on social media: Never post photos of your checks or bank statements online.
• Use secure networks: Only enter your banking details on websites that use "https" and are from trusted providers.
• Monitor your account: Check your transaction history regularly. If you see a transfer you didn't authorize, contact us immediately.
• Destroy old checks: If you close an account or have voided checks, use a shredder to destroy them.

We use advanced technology to protect your money, but staying vigilant is the best first line of defense.

Start using your Revolut account

Ready to manage your money with more clarity? Setting up your Revolut account to receive transfers takes just a few minutes. Here's how to get started:

1. Download the app: Find us on the App Store or Google Play Store and download the app to your phone.
2. Sign up for Revolut: Follow the prompts to create your account. You'll need to provide some basic information and verify your identity with a photo of your ID and your SSN.
3. Add money: Once your account's ready, you can add money using a debit card, a bank transfer from another account, or via Apple Pay or Google Pay.
4. Find your details: Tap Details on your home screen. You'll see your routing number and account number displayed clearly.
5. Share and receive: You can copy these numbers to send to your employer for direct deposit or use them to link your other bank accounts.

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