What is Bank ABA number
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For financial transactions like wire transfers and direct deposits, a customer needs an ABA number so that they can easily find their bank. On the bottom left of a check, you can find the nine-digit ABA number. This article talks about the bank ABA number.

How Does It Work?

The ABA routing transit number (ABA RTN), which has nine numbers, is written on the bottom of checks in the United States to show which bank the check is drawn on. The American Bankers Association made the ABA routing number, which is still used today, in 1910. It says which bank or other financial institution is responsible for paying for an instrument that can be traded.

It was first meant to identify only check processing terminals, but now it also identifies people who use automated clearinghouses, electronic money transfers, and internet banking. Since it was first made, the ABA routing number has changed to take into account the Expedited Funds Availability Act, MICR, and Check 21.

A nine-digit code used to identify financial institutions in the United States, an ABA number is also known as a bank routing number. This number is used by banks to do financial tasks for their clients, such as direct deposits, wire transfers, and automatic bill payments. It’s written in a big way on the checkbook register.

Most of the time, all you need to do is give the person asking for your ABA number and account number. The bank, the biller, and/or your employer can take care of the rest (or whoever is setting up the automated transfers).

Make sure with your bank that you can keep using the old numbers before you order new checks or sign up for new services. It’s possible that the same route number could be used forever. In the following, ABA numbers have a complicated format.

#1. What Does the Name Mean?

If you want financial institutions to be able to find your account, you’ll need to give them an ABA number, which works like an address. People may call ABA numbers RTNs, which stands for “routing transit numbers,” or check routing numbers.

#2. They Can Be Read by a Computer

Routing numbers are often printed on checks with magnetic ink, which makes it easier for computers to figure out what the numbers mean. The MICR font is used so that a computer can easily read the numbers, whether the printer has magnetic ink or not. Taking a picture of the check with a phone can make it easier to deposit it.

The first four numbers of a routing number are the Federal Reserve routing symbol. However, the first two digits mean different things depending on how they are put together. On its website, the ABA gives a lot of information about each series. In the following four digits, you’ll find the ABA institution identifier.

In the ninth number, there is a checksum. However, the first eight numbers in this equation are a hard math expression. Also, if the result and checksum don’t add up to the same number, the transaction is flagged and sent to a person to be checked.

How to Find Aba Numbers and Use Them

You can get the unique ABA number for your account from a number of places. In addition, look at the bottom of a check in your checkbook to see what they are.

#1. On Checks Written on Paper

Every check has a routing and transit number that the bank can use. However, a nine-digit number is usually found in the bottom left corner of a personal check. On computer-made checks, the digit could be in a different place (like online bill payment checks or business checks).

#2. Get in Touch With Your Financial Institution

Before you can see this information online, you may need to sign in to your bank account. Check the website of your bank for direct deposit and ACH information. You could also talk to the customer service department of the company.

#3. Choose the Right Number

You need to find the ABA number for your bank account, since your bank may use more than one. The ABA number of a bank could be a little different from one branch to the next, and if a bank merged with another, the new bank could have a different ABA number. Several banks and credit unions use a different ABA number for wire transfers than they do for direct deposits and ACH payments.

Even if you have the right number for ordering checks, you may need to use a different number when making wire transfers or paying bills online. Whenever you don’t know the right number to call your bank, it’s best to ask a customer service representative for help.


In 1911, the American Bankers Association (ABA) thought of using routing numbers. Different banks had different ideas about how to identify customers. However, in December 1910, the ABA called a meeting of clearing house managers to take place in Chicago. A committee was chosen to come up with easy-to-remember phone numbers for all the banks in the country. Also, the American Bankers Association made the codes public for the first time in May 1911. The committee was made up of W. G. Schroeder, C. R. McKay, and J. A. Walker.

The new reference book was released by Rand-McNally and Company. The ABA clearing house codes are like the subheadings of a decimal outline. The prefixes tell you where the bank is located, while the suffixes tell you what kind of bank is there. About half of the prefixes are for big cities, and the other half are for places in the United States. Since the United States Census of 1910, lower prefixes have been given to places with populations above a certain level.

In the same way, within each prefix region, banks are numbered based on how many people live in the city and how long the bank has been around. However, towns with only one bank are numbered from A to Z. When a new bank opens, the publisher of the current directory of banks decides what its transit code will be. The American Bankers Association asked that all financial institutions only use the directory so that there is no difference in how checks are processed. 

More Information

The book is often called just the Key or the Key to Numerical System of the American Bankers Association. It was put out by Rand McNally & Co. Rand McNally focused more on making maps after moving to Skokie, Illinois, in 1952. Also, Accuity, which is based in Skokie, has been the ABA’s official bank number registrar since 1911.

In 2014, it was owned by Reed Business Information, a British company that publishes professional reference works. But Reed Business Information is owned by Reed-Elsevier, which is a company that puts out online English-Dutch dictionaries. Reed Business Information puts out the ABA Key to Routing Numbers every six months. 

Over time, the Federal Reserve Act, the Expedited Funds Act, and the Check 21 Act have changed the way the ABA’s bank identification numbers work. In 2014, magnetic-ink routing numbers with nine digits for the U.S. Federal Reserve were added to the Key.

How to Look Up ABA Routing Numbers

LexisNexis Risk Solutions is not only the Registrar, but it also makes the American Bankers Association’s Key to Routing Numbers. Since 1911, this Directory has been the best place for bankers to find official routing number information. The ABA Key to Routing Numbers is changed twice a year to keep up with how quickly the banking industry changes.

It is possible to lose several thousand dollars every month because of wrong, incomplete, or missing routing number information. With the most recent ABA Key to Routing Numbers, you can be sure that you have accurate information at your fingertips. However, each new version shows many changes, like job titles and bank account numbers that have been added or removed.

This very useful tool can make it easier to handle collections, wire transfers, pre-authorized drafts, and transfers, as well as checks and returned items. There are more than 28,000 live nine-digit routing numbers and routing number data from the past five years. With LexisNexis Risk Solutions’ full suite of payment solutions, which includes routing numbers in print, web lookup, and electronic formats, it is easier to process payments.

What Is the Location of My Bank’s Routing Number?

The following are many choices.

#1. A U.S. Bank Services App for Smartphones

You can find your routing number in one of two places in the U.S. Bank Mobile App. Launching the U.S. Bank Smart Assistant app is the fastest way to get help. You can find it through the following ways below;

  • Type in your login information and click the account you want to get into.
  • Just click the link that says Account Settings (below the available balance).
  • Go to the menu and choose Account details from there.
  • The last four digits of your account number and a link to your full account number and routing number will be shown.

#2. Bank Transactions Conducted Entirely via the Internet

By choosing the right account in online banking, you can get the routing number. The short name of your account, the last four digits of your account number, and the routing number are all in the first box. If you click on the link in the last sentence, you can see the whole account number.

#3. Check Out the Most Recent Copy of Your Monthly Bill

Your routing number will be in the top right corner of your monthly statement. When you switch to getting your statements online, you can be sure that you’ll always be able to get to them quickly.

#4. The Books of One’s Bank Account

In the bottom left corner of every check is a nine-digit number. Also, this is the routing number. Your account number, which is usually 10 or 12 numbers, is in the second set of numbers at the bottom of your checks. If you are writing a check, write the number that is farthest to the right.

#5. U.S. Bank Routing Number Lookup

Each of the dozens of routing numbers that U.S. Bank has is tied to a certain area where the bank does business. You’ll get a routing number that is unique to the area where your account was opened.

Is an Aba the Same as a Routing Number?

The same nine-digit code used to identify banks in the United States goes by a few different names, but they all mean the same thing: an ABA routing number.

How Do I Find My Aba Account Number?

The ABA routing number is written on the bottom of your checks. Also, the next number is your account number, then the check number, and the last number is the ABA routing number.

Is the Aba Number the Same as Swift?

Either a SWIFT code or an ABA number can be used to find a recipient’s bank. If you need to send money anywhere in the world, you won’t need an ABA number, but you will need a SWIFT code.

How Do I Find My Aba or Swift Code?

You can find your SWIFT code, BIC code, and IBAN on your bank statement or in the account details section of the secure area of your online banking.

Is an Aba Routing Number Needed for International Transfer?

In the United States, you need an ACH (Automated Clearing House) or ABA (American Bankers Association) routing number, which is a nine-digit identification number. However, any international money transfer to or from the United States needs the routing number and SWIFT code of a US bank.

Is the Aba Routing Number Only for THE US?

Routing Numbers are only needed by U.S. banks, even when money is deposited from another country. Banks all over the world use IBANs to accept payments made in other currencies.

What Does Aba Stand For?

The goal of Applied Behaviour Analysis is to look at behavior and change it (ABA). It’s a group of methods and approaches that have been shown to help teach people with autism new skills and behaviors.

In the field of Applied Behavior Analysis, there are many ways to study and change behavior. Since ABA is a treatment that can be changed, it can be made to fit the needs of each person.


For financial transactions like wire transfers and direct deposits, a customer needs an ABA number so that they can easily find their bank. The ABA number of a bank will also be used as the routing number when making wire transfers. ABA Routing and Transit Numbers (RTNs), which are processed through the ACH Network, are used for direct deposits, bill payments, and other types of automated money transfers.

What Is a Bank ABA Number FAQs

What is a routing number's length?

Banks have their own unique nine-digit numbers called routing numbers that serve as an address for financial transactions. Money transfers, direct deposits, digital checks, and bill payments are all examples of electronic transactions that employ this system.

Is it safe to give out a bank account number and routing number?

Maintaining the security of your banking information is essential. Forgery of checks is only one example of how your banking information could be misused. One such possibility is that they can make a fake ACH transaction from your account.

Do I need a routing number to deposit money?

Both the routing number and account number are required for any monetary transactions to or from your bank account. Direct deposits, bill payments, and other electronic wire transfers all require this information.

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