pop estimates across Allegheny county
Here is a quick and dirty map of what the data shows across the county. Again, take with a grain of salt as to what it actually says about population change, but the the data does probably reflect pretty well residential housing construction across municipalities.
The colors do exaggerate the changes especially for where there was 'decline'. For the most part the actual numbers are quite small up or down in both absolute and percentage terms. I thought any other more detailed shading would imply overinterpretation. So a very broad measure of where housing activity is relatively stronger within the county is what this is for the most part. No surprises, but that may be a surprise in itself. That the general pattern is mostly the same as every other year for last 50 is something. Some of the South Hills suburbs look to be at least temporarily out of the growth crescent that has defined change within Allegheny County for decades is about all I note. That some munis have maintained building activity through depth of a very housing-focused recession is something in itself. Anyway, this is all data you can look at directly from the census here.