To change routing number on cash app in only two conditions one is to change your locations and second to create new cash app account. If you move from one state or from one area to another, you will create a new Cash App account to correspond with the new area routing number of your new address or another state in the US.
To use your account and routing number:
Tap the Banking/Money tab on your Cash App home screen.
Tap the routing and account number below your balance.
Use the options to copy your account and routing numbers.
Provide the account and routing number when prompted for a bank account during direct deposit setup.
Hope this helps, J Wick