How many check number on a check?

Typically there are 3 sets of numbers on a check.

The check number:
This is at least 4 digits, although it can be 0001 or 0100. The check number can be 14 digits in some cases. Typically under #100 are reserved for starter checks or check drafts, check by phone items or custom debits. Most checking accounts start out with 100 after the starter checks are finished, but you can request your check printer start at any number you choose.

The routing number:
This is the 9 digit number at the bottom of the check between the transit symbols. It would look like this

|:011000138|:

The routing number identifies the bank the check belongs to. When a check is deposited into one bank, they find the routing number, and route the check to the bank it came from to collect payment.

The account number:
The account number is the unique number for the individual account at the bank. This is usually 10 digits, but the account number can be up to 16 and as few as 5.

The account number is followed by the ON US symbol which looks like this ||'