A check routing number is a nine-digit number, to identify the financial institutions. There are three sets of numbers at the bottom of the check, the sets of numbers with nine digits are the check routing number. The second set is the Check Account Number. Third set of numbers, is the check number. Most banks will have only one routing number. Some major banks which operate in multiple regions might have more than one check routing number.
Significant banks may have more than one routing number. It is dependent upon things like the location of the account or for any other critical mission for which the routing number is utilized. However, it signifies that no two banks will ever have an equivalent routing number. When you create a check or write a check, the sets with nine digits at the bottom of the checks are the routing number for that financial institution.