I suspect that some people reading this particular thread would like to jump in and say: "Have you folks forgotten that we are supposedly discussing RADIO here. What's up with seat-belts and battleships from 1973 and speed limits?"
And we should come back to some discussion more directly about broadcasting..... BUT: Josh, the original poster, was asking advice about the viability of Miller County, GA as a place where someone might want to be "doing radio". I think this thread, complete with it's strange side-trips is actually quite constructive.
When I was looking for a radio station all my own, I didn't look at Miller County, but a couple of communities in that direction. I knew that when I got there I was going to try to sell advertising and my prospects weren't going to agree to a schedule until I agreed to sign their petition to secede from the Union over the mandatory seat-belt law.... and a lot of other similar socio-political issues... I knew it was the wrong place for ME.
I like New Yorkers. That alone could get me thrown out of some churches in some Southern rural counties.
Josh... there is more to the question you asked... than what you asked. Population growth and economic growth are not the sole characteristics of this kind of market. Going back to church related issues.... there are communities where you have to give serious consideration to which translation of the Bible you are going to carry with you if you want to take one to your Sunday School class.
Big story in today's Atlanta newspaper. There is one county in Georgia where right now if you were operating a radio station, you might be "required" to declare whether you supported or opposed the first ever fully racially integrated Senior Prom for high school students. Either way you go on the subject could cost you some advertising business. Now in fairness to the community in today's story.... (and I've never been there) but it looks like this is not going to be a harsh event. The students themselves reportedly have organized a voluntary effort to have this OPEN prom. They want it.... whether Grandpa approves or not. And I suspect 3 or 4 years from now people will have a hard time remembering why there was any news story in the first place.
Local social issues and your compatibility with them ranks right there along side the economic issues.
And you will need to budget to buy your pick-up. And you will need a dog. And one of your first duties will be to teach the dog "to get in the truck". People will ask you: "How long did it take you to teach the dog to get in the truck?"
Am I making fun of these traditions? Absolutely not! But if you are not comfortable with some of these traditions, life in a small, small rural market can be a challenge.