An ACH routing number is a unique 9-digit numeric ID assigned to each banking institution in the US. It is used in conjunction with an account number to send or receive an ACH payment. ACH routing numbers are used for electronic transactions between financial institutions, unlike ABA routing numbers which are used for identifying specific financial institutions on checks.

To find your ACH routing number, you can try the following methods:

• Check your checkbook: The ACH routing number may be the 9-digit number to the left of your account number.
• Log in to your online banking platform: You can find your ACH routing number by logging in to your online banking platform.
• Search online: You can search online for "ACH routing number" and your banks name.
• Contact your bank: You can always contact your bank to find the information.

Its important to note that while many banks will use the same code for their ABA routing number and their ACH routing number, you may want to confirm your ACH routing number by checking your banks website.