"Domicile" is a matter of facts and circumstance. Your domicile (your permanent residence) is where you plan to return to after you are finished doing whatever you are doing out of state. It is where you have a permanent address, an landline (as if), your drivers license, your voting registration, and so on.
Your domicile remains what it is until you take positive steps to change it. In your case, this means, rent/buy property in Oklahoma, getting a landline there ( 🙂 ), registering to vote there, and telling all your friends that you have moved there.
On your last year's return, did the Maryland return show a credit for "Other state taxes paid" (i.e., Oklahoma's)?
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