My apologies if this is old news but I don't recall seeing this here before. I thought this was an interesting article on good places for APNs. Admittedly, it doesn't take much into consideration but its still helpful for some.
Best Cities for Nurse Practitioners
The median salary for a nurse practitioner, which ValuePenguin uses as the basis for the rankings, is $88,130 in the United States as of May 2012. The median salaries for nurse practitioners range widely, starting at $19,910 in the San Juan / Caguas / Guaynabo, metropolitan area in Puerto Rico to $124,600 in Monroe, MI.
There are 89,420 nurse practitioners employed in the United States as of May 2012, from 30 in various cities to 4,130 in the New York / White Plains / Wayne metropolitan area. The job outlook is bright: nurse practitioners' jobs are projected to grow 26% from 2010 - 2020, which is twelve percentage points above the national job growth of 14%.