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File:Allegheny County Pennsylvania incorporated and unincorporated areas Pittsburgh highlighted.svg - Wikimedia Commons
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Allegheny County gains population for first time in six decades, says census | News | Pittsburgh | Pittsburgh City Paper
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Pittsburgh, Allegheny County could make historic turn in next census - Southwestern Pennsylvania Commission
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Allegheny County population dropped in year after 2020 census, latest estimates say | Pittsburgh Post-Gazette
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