How to Find the Routing Number on a Check

Q: How long are account numbers on a check?

Account numbers are typically eight to twelve digits. They can be found to the right of the routing number on a check, either before or after the check number.

4 Min Read | Last updated: May 20, 2026

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This article contains general information and is not intended to provide information that is specific to American Express products and services. Similar products and services offered by different companies will have different features and you should always read about product details before acquiring any financial product.

Finding the routing number on a check is easy. Learn which numbers to look for and how they’re used in banking.

At-A-Glance

Routing numbers are displayed in the bottom left corner of a check.
Your routing number identifies your financial institution.
Account numbers, on the other hand, identify who the account holder is.

The routing number on a check is an important piece of information for financial transactions since it identifies your banking institution. In this article, we’ll explain why that’s important and where you can find the routing number on a check.

What Are the Numbers on a Check?

The routing number (also sometimes referred to as an ABA routing number or routing transit number) is one of the numbers that appear on a check. It serves as the bank or credit union’s identifier or ID.^1,2 But if you look at a check, you’ll also see two more numbers: an account number and a check number located at the bottom of the check.

Here’s a more detailed breakdown of what they are specifically used for:

Routing Number
A routing number is a nine-digit number that identifies a financial institution. It’s displayed on paper checks and is used for funds transfers, direct deposits, digital checks, and bill payments.²
Account Number
The account number identifies the individual or business checking account. It tells the bank where to withdraw funds when someone cashes a check. It’s also used for direct deposit and direct payments.³
Check Number
The check number helps the account holder keep accurate records of their transactions. The bank can also use it as a reference number to research account activity.³

When you write a check, it’s recommended that you record the check number and amount somewhere in case there’s a dispute later.³ Your bank or credit union may provide a check ledger you can use.

Where Is the Routing Number Located on a Check?

Routing numbers are displayed in the bottom left corner of a check. The routing number contains nine digits.³

The account number may be the longer of the two groups of numbers that follow the routing number.³ On some checks, the account number may be immediately after the routing number. Other checks may display the check number first. Make sure you copy them if the bank asks for an account number.

Routing numbers are essential for many bank transactions. Common examples are for reordering checks, setting up direct deposit for your paycheck, or receiving an electronic tax refund.³ Payment apps for your mobile phone may also require a routing and account number to send and receive funds.⁴

Other Ways to Find Your Routing Number

Some people no longer use paper checks, so they can’t look for the nine digits displayed on a check. Thankfully, that’s not the only way to find routing numbers. You may be able to find your routing number in a couple of different ways:

Online Banking
The routing and account number for a bank account are often available at your online banking site.
Monthly Statement
Your monthly statement should display your routing number on the first page. The full nine digits should be there.⁵

Frequently Asked Questions

In the U.S., routing numbers are nine digits. These numbers are used to identify banks and credit unions.²

Account numbers are typically nine to twelve digits. They can be found to the right of the routing number on a check, either before or after the check number.³

¹ “ABA Routing Number,” American Bankers Association

² “Routing Transit Number (RTN),” Bureau of the Fiscal Service

³ “How to Read a Check,” Experian

⁴ “How to Link Your Bank Accounts,” Experian

⁵ “What Is a Routing Number?,” Experian

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Kevin D. Flynn is a financial services provider, business coach, and financial writer. He lives in Leominster, Massachusetts, with his wife Evelyn, two cats, and ten wonderful grandchildren.

All Credit Intel content is written by freelance authors and commissioned and paid for by American Express.

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