S.N.P.J. once had the distinction of being the least-populated borough in the state until a mine fire beneath Centralia made that borough unsafe to live in.
As of 2007, Centralia had a population of 9. I rode there this past weekend and there are still at least 3 or 4 houses being lived in.
Don't know when Google maps photos are taken, but note the green lawns.
View Centralia in a larger map