Like David says, they're all unnatural as they are.
if you speak in the first person, a couple of these are possible:
"I'm a country person", "I'm a small-town person".
Generally you say as David suggests.
Most common where I am is:
"He's from the country", "He's from a small town/city".
One we sometimes say here is "He's from the bush" (from a rural area), but this is very Aussie, I think.