 The state leaders are Chester County with 20.5% and Montgomery County with 18.5%.With 17.3% working in the professions, Lancaster County is 31st in Pennsylvania,
compared to a state average of 21.5%.Centre County leads with 31.8%, undoubtedly due to Penn State's giant footprint in an otherwise rural county, but the upscale Philadelphia suburbs of Montgomery County give them 27.2%.