You forgot to include Alleghany county, which is where Pittsburgh is located. South Western Pennslvania is usally considered the part south of Butler county. The eastern border is usally undefined. Pittsburgh, Pennslyvania is usally considered the 'center' of this area. South Western Pennsylvania is also the second most populous area in the state of Pennslvania. The first is Philadephia. This area is highly idiotic politically. Pennslyvania used to be one of the main deciding votes in the electorial college but it seems that people are moving elsewhere and out of this area. Contains many great colleges, such as Penn State University, Carnegie Mellon University, University of Pittsburgh and Robert Morris College. I think that this area will be highly populated in the future because it would make a great link for computer networks and would make a nice area for another Silicon Valley.