DETROIT, MI 48275. Comerica Bank - Texas's routing number (the leftmost number on the bottom of a check) is 111000753. Sometimes, banks have multiple routing numbers for different branches or uses. Please make sure this is the correct routing number for your branch! The main phone number for Comerica Bank - Texas is 800-581-9857. The assigned Federal Reserve Office for Comerica Bank - Texas is Fed 111000038.