And here's the top 250 median salary counties as a google doc: https://docs.google.com/document/d/1U-opUT1wyVtrWuXxfvARV7xt...
Are tech job salaries really correlated to anything at all? When I mention my salary to other software people I get either "I wish I made that much" or "why do you make so little?"
That's what happens with a market starved for good people.
When you get to the point where nobody comments on how cheap you are. That's when you've reached the bottom limit of what you should be earning.
Ask for more.
Also, if you start out as a freelancer, you can iterate your paycheck every couple of months. Do that. Ask each new client for 25%+ more than your previous client. Eventually you will find a ceiling.
Figure out how to go beyond the ceiling.
Encourage all your friends to do the same. This gives you an environment that always pushes you to earn more.