Couldn't find anything specific for Dennison, but it is still likely one of these. You may have to call and confirm. The only one that has a different routing number and address is Sherman, but I think the others are the same bank, but different branches. I just copied all that were listed.
#111901645 AMERICAN BANK OF TEXAS BOX 1234 SHERMAN TX 75091-1234 (903) 893-7555 083199
#114909220 AMERICAN BANK OF TEXAS N.A P O BOX 888 MARBLE FALLS TX 78654-0888 () - 070300
#114909220 AMERICAN BANK OF TEXAS - SEGUIN P.O. BOX 888 MARBLE FALLS TX 78654-0888 (830) 379-5236 060906
#114909220 AMERICAN BANK OF TEXAS, N.A. PO BOX 888 MARBLE FALLS TX 78654-0000 (830) 693-3676
Update: now that I think about it Sherman and Dennison are sister cites, so it's probably the 1st one on the list. Added another search site and can't find any that list Denison separately. If you have an account and don't have checks to locate the routing number, just call the phone number on the back of your debit card. Customer Service will give it to you.
Good Luck! ~J~
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I need routing number to American Bank of Texas in Denison, Texas
