Remember the kerfuffle over municipal population estimates for 2011 a couple months ago. In re: Misreferencing Misoverestimated Population
. This makes pretty clear that their methodology this cycle was mostly an extrapolation of county trends spread evenly across municipalities.
Via my friends at the PA State Data Center is their map of the month of the same data for all Pennsylvania municipalities. Anyone want to bet that county lines don't matter as much as it appears they do in the data shown in the map?