Five states are tied for that distinction. At the beginning of the tournament, the following states had four teams each in the tournament. Of those five states, two, Kentucky and Ohio, had teams make it to the Final Four.CaliforniaKentuckyNew YorkNorth CarolinaOhio
Texas had the most this year
North Carolina has 5, followed by New York, California, Kentucky, and Ohio at 4.
Pennsylvania and Virginia each have 5 teams.
North Carolina sent 5 teams to the 2012 NCAA Mens Basketball Tournament. NC State, UNC, Duke, Davidson, and UNC Asheville. I'm pretty sure this was the more than any other state. Virginia had a good showing as well. I'm not sure if Georgetown is in Virginia or Washington D.C.
North Carolina has had the most Final Four teams, with UNC going to 18 Final Fours, Duke 15, and NC State 2, for a total of 35 teams.