| | | Venango County | PA | 42121 | | Oil City, PA 36340 | | Central | nonmetro county (rural) | manufacturing-dependent | https://maps.google.com/?q=VenangoCounty+PA |
| | | Warren County | PA | 42123 | | Warren, PA 47620 | | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=WarrenCounty+PA |
| | | Washington County | PA | 42125 | | Pittsburgh, PA 38300 | Pittsburgh-Weirton-Steubenville,
PA-OH-WV 430 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=WashingtonCounty+PA |
| | | Wayne County | PA | 42127 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=WayneCounty+PA |
| | | Westmoreland County | PA | 42129 | | Pittsburgh, PA 38300 | Pittsburgh-Weirton-Steubenville,
PA-OH-WV 430 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=WestmorelandCounty+PA |
| | | Wyoming County | PA | 42131 | | Scranton--Wilkes-Barre,
PA 42540 | | Outlying | metro county (urban) | manufacturing-dependent | https://maps.google.com/?q=WyomingCounty+PA |
| | | York County | PA | 42133 | | York-Hanover, PA 49620 | Harrisburg-York-Lebanon,
PA 276 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=YorkCounty+PA |
