Quite a few states have laws that don't allow dry counties, Utah and Idaho being two of them. And if you're familiar with their liquor laws the reason is quite obvious, both are "control states" (meaning the state has a monopoly on the wholesaling of alcohol) and thus allowing any counties to go dry would deny the state a source of a income.
But Pennsylvania is a control state and there's a lot of yellow on the map in PA?
Here are the 17 states that effectively prohibit dry counties:
-Arizona
-Hawaii
-Illinois (though the aforementioned village, South Holland, is able to get around this by not issuing alcohol licenses)
-Indiana
-Iowa
-Maryland
-Missouri
-Montana
-Nebraska
-Nevada (with the exception of Panaca, which is dry via grandfathering)
-North Dakota
-Oklahoma (despite what the map shows, they've apparently enacted alcohol legislation that trumps municipal and county law).
-Oregon
-Pennsylvania
-South Carolina
-Utah
-Wyoming
Also, Idaho allows localities to prohibit on-premises sales, but not off-premises sales, which effectively prevents any "fully" dry localities from existing.
Is the map just wrong for PA then?