All checks contain several sets of numbers: the check number, the account number, and the routing number. The routing number is unique to each bank, and it identifies the institution from which the check originated; the account number specifies the account from which the funds will be drawn; the check number indicates how many checks have been written from that account.

Reading a Routing Number on a Check
Step
Turn the check right side up.
Step
Locate the long strings of numbers at the bottom of the check.
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Step
Find the set of numbers set off by colons and vertical dashes.
Step
The numbers inside these marks (usually about eight or nine numbers) make up the routing number for the financial institution that holds the account from which the money will be drawn.