If both state returns were filed electronically, then there is nothing you need to do unless one or both states asks for a copy.
If you choose to file your state returns by mail , then you should send a copy of your Arkansas return with the Louisiana return. They do want to see if you are paying tax to another state to confirm you should have a credit for taxes that are paid to another state on the same income.
The state mailing address can be found by selecting your state below.
State Information
