Banks Routing Numbers

There is a lot of data available when describing a banks routing numbers, how they are generated and what each part of that aba number represents.

Basically, an aba banks routing number is described as a nine digit number (eight digits plus a check digit) which identifies a specific financial institution within the US or one of it’s Possessions.

They are sometimes also referred to as bank “Transit Numbers” in other countries, such as Canada, however, there is also a portion of US Banks Routing Numbers that is also referred to as the “Transit Number”.

Confusing, I know, but as it stands, US banks routing numbers are not specific to US Banks per se, but may be assigned to foreign banks located within the US or their possessions.

They are administered by the Routing Numbers Administrative Board under the sponsorship of the American Bankers Association.

An ABA transit number appears in two forms on a standard check – the fraction form and the MICR (magnetic ink character recognition) form.


banks routing numbers micr font


Both forms give essentially the same information, though there are slight differences.

As you navigate our pages, you should get a better understanding of a banks routing numbers [ yes, they can have several ], and lessen the confusion between the terms aba transit numbers and aba routing numbers.

We also recommend you visit They have been providing this data for many years, as well as tools for validating banks routing numbers and recovering missing aba check digits. If nothing else, they are worth visiting.

You also may want to bookmark this site. We will be uploading more routing number and federal reserve data as it becomes available.

Note – aba refers to the “American Banking Association”