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Critical Counties - Allegheny, Penn.: Pittsburgh's home 01:16

Critical counties: Watch Allegheny County, PA, in this election

Updated 4:04 PM ET, Mon September 26, 2016

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Critical Counties is a CNN series exploring 11 counties around the country that chief national correspondent John King has identified as key in the 2016 election. These counties could play an outsize role in the election and offer an instructive example of what the political parties have accomplished. Wake County is the fourth county in the series, which runs through Election Day. Explore the other critical counties.

Washington (CNN)Pittsburgh was a treasure of the industrial age, and as the times have changed, so has it. This blue pocket of the post-industrial United States sits in Allegheny County, a hub of urban and suburban life in western Pennsylvania. Far from the liberal hub of Philadelphia in the east, this county is the heart of battleground Pennsylvania.

If Hillary Clinton scores a big victory here, it's a strong sign of her chances in this swing state. But if Trump sways this county, or turnout here is low, it could mean he takes Pennsylvania -- putting him a lot closer to overall victory.

Meet Allegheny County

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Here are a few of Allegheny's notable inventions, companies and people.

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Tim
Murphy
representative
Keith
Rothfus
representative
Mike
Doyle
representative
Bob
Casey Jr.
senator
Pat
Toomey
senator
Tom
Wolf
governor

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