<P> ABA RTNs are only for use in payment transactions within the United States . They are used on paper check , wire transfers , and ACH transactions . On a paper check , the ABA RTN is usually the middle set of nine numbers printed at the bottom of the check . Domestic transfers that use the ABA RTN will usually be returned to the paying bank . </P>
where to find transit aba number on check
the middle set of nine numbers printed at the bottom of the check