dmertz
Level 15

State tax filing

The 6-months requirement just determines whether you are a resident (filing Form 502) or a non-resident (filing Form 505).  It has nothing to do with determining whether you are a full-year or part-year resident.  The fact that you were a resident of Maryland for less than the full year means that you were a part-year resident.  You were not a full-year resident.