Population 2010

183,862

Population 2020

193,763

Registered Voters

135,658

Republicans

76,776

Democrat

39,872

Minor Party

13,069

No Party

13,069

Brief Political History

Butler County has long been one of the most consistently Republican counties in Pennsylvania. The last Democratic presidential candidate to win it was Lyndon B. Johnson in 1964, when he won a national landslide and carried all but four counties in the state. In the 2000 U.S. presidential election, Republican George W. Bush received 62%, while Democrat Al Gore received 35%. In the 2004 U.S. presidential election, the county was carried by Republican George W. Bush 64% to Democrat John Kerry 35%. In the 2008 U.S. presidential election, the county was carried by Republican John McCain 63% to Democrat Barack Obama 35%. Since 2008, Butler County has continually given Republican nominees support in the mid-60s, with both Mitt Romney Mitt Romney and Donald Trump Donald Trump receiving around 66% of the vote in 2012, 2016, and 2020.

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