Iowa?
Damnit.
Well, we have quite a good difference in climate with the seasons.
Pidgey and Rattata...actually, pretty much every early game derp like Rattata, Sentret, Bidoof, Lillipup, Patrat, Spearow, Pidove etc. would all be around here since most starter areas seem pretty countryesque.
Purrloin, because Meowth seems more like a city kind of cat.
I live near a wooded area, so I could see some Bellsprout, Spinirak, Caterpies, pretty much any derp bug. Hoppips because of the fields near here.
Swablu, maybe, as there are some wide open spaces for them to fly.
Definitely a Grimer and Trubbish downtown.
I could see some Magikarp surbviving in the river since they're really hardy. Probably a few Barboach and Whiscash too.
Wingull and Pelipper.
Damn, the list goes on. I don't want to go super in-depth on a hypothetical question about real Pokemon.