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9. always 9.
Bank routing numbers can be found on a check next to the account number or found on some websites. Many websites also offer lists of routing numbers for various banks, or alternatively just ask in your bank.
There are two types of numbers on a check, the ABA-designated routing number and the check owner's bank account number. The American Banking Association (ABA) assigned ABA (routing numbers) in 1910, since then each bank is required to have its own ABA number. Originally the first four numbers were supposed to give away the location of the bank, now the numbers are no longer accurate to that purpose. The fifth through eighth numbers are all used by the Federal Reserve to determine routing information on the checks. The ninth number is used to verify the previous numbers are correct. A standard bank account number is nine or ten digits long, but can be as long as seventeen digits, it just depends on the bank in question.
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Each of mine are ten digits.