To get licensing information on another state, check out that state's board of nursing - try googling. I know some states are part of a compact where your license is valid in multiple states (i.e. VA, NC, SC, CO, etc), but Missouri is not part of this compact. From my understanding, you usually have to pay a fee to receive "licensure by endorsement" in that state. You do not need to retake your NCLEX though once you pass and NCLEX is the same for all states. Hope this helps! :-)