The burbs may be turning bluer because people like me are moving out of them and into the rural areas.
A good example of bluing of the inner suburbs and the reddening of the exurban areas can be seen in New Jersey, Bergen County was once solidly GOP, albeit on the RINO side. It is now solidly liberal, as Hudson and Essex Counties have been for almost a century. However, the three northwestern counties bordering Pennsylvania remain Republican strongholds.