Cali definitely has the greatest concentration of high level players in my opinion. NC doesn't really have much in that way and CERTAINLY not close to me(I live 2.5-3.5 hours from most people and the average local tournament but stuff is being hosted about an hour+ away now so that's nice).
VA(Tope, etc) is above(north of) NC and they come down once in a while which is good competition, and GA(Mike G, XIF if he counts for GA, Druggedfox, Fullmetal, SleepyK are the main ones that travel I believe) also borders us and we seem those guys the same amount, probably once every month/every other month maybe?
Either way, none of that holds a candle to the scores of talented players in a given area of California. I've talked to a few WC players about where they are and how far they are from other good players and I'm always surprised by how good they have it lol.
PS: If you're a cali player and I got you/the state all wrong, then my bad but it really seems that way from who I've talked to and who I've played.
Edit: Basically there are talented players in neighboring states that are several hours away and then I can have decentish competition by going 3+ hours in my state for a few people(but usually tournament in that time range as well).
Also, Duke is close to a lot of people lol that'd work out well for anyone that went there. XD