Where would you find a magnemite?

I find them randomly in town. I think they're a bit rare, but you can find them anywhere.
 
I don't think electric Pokemon are actually by power plants. I actually leave fairly close to one and I've never seen them around there, but I've seen common Pokémon like Pidgey appear. I think the game treats them as field Pokémon from what I can tell.

They're around, just a bit harder to find in some places, for sure.
 
Theoretically, you can find anything anywhere, the regions/locations just offer a higher chance of catching that particular type.

I live in a very wooded area probably 20 minutes from downtown. Have only played GO downtown once so far and found a Voltorb.

That's consistent with what I've heard that Steel, Electric, etc, are most likely found in urban centers.
 
You can find any pokemon anywhere except legendaries. Water pokemon will be much more common near water but I've found goldeens and magikarps in the middle of a field quite a few times. Magnemites for me are more common in a down town area but have seen others catch them in pure residential.
 
there all I catch around me have so many and about 150 candys for them
 
I caught three Magnemites last night in a park that was between a highschool baseball stadium and a river. Not completely sure, but I think it was the stadium that drew them in, I've spent hours hunting in parks and near bodies of water and have never seen them before last night.
 
I found a Magnemite on a train station yesterday, so you're certainly able to meed them in the middle of city as well. So that's on all sorts of terrain from what I read above.
 
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