Primary state of residence (PSOR)
Primary state of residence is the state where you legally reside — evidenced by your driver's license, voter registration, and tax filings — and it determines your eligibility for a compact multistate license. Under the Nurse Licensure Compact, your license is issued by your PSOR, not by the states where you happen to work.
PSOR exists to stop license shopping: without it, everyone would license in the cheapest member state. With it, the compact anchors your credential to the state that can actually verify who you are, then extends the privilege outward.
Two consequences matter in practice. First, working in a compact state does not make it your PSOR — a travel nurse living in Texas keeps a Texas multistate license through assignments in Florida, Georgia, and Ohio. Second, moving your residence triggers a real obligation: endorse into the new home state and declare the new PSOR. Miss that and you are practicing on a license your own move invalidated.
Nurses living in non-compact states (California, New York, and the rest) cannot hold a multistate license at all, no matter how many member states they are licensed in — each of those licenses is single-state.
Related terms
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Frequently asked questions
How do I prove my primary state of residence?
Driver's license, voter registration, and federal tax return address are the standard evidence. Boards ask you to declare it on the application and can request the documents.
What happens to my multistate license if I move to a non-compact state?
It converts to (or is replaced by) a single-state license — the multistate privilege requires a PSOR inside the compact. You then need the non-compact state's own license by endorsement.
Reviewed by Billy Reiner, Editor · verified against primary sources 2026-07-21
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