Saxonburg was founded as a Prussian colony by John A. Roebling, a civil engineer, and his brother Carl.

Butler's highest-ranked federal official is William J. Perry, Secretary of Defense under President Bill Clinton from 1994 to 1997.

On July 13, 2024, Butler County was the site of an assassination attempt of former President Donald Trump as he spoke at a campaign rally.

The county has a humid continental climate (Dfa/Dfb) and average monthly temperatures in Butler borough range from 27.7 °F in January to 72.1 °F in July.

[citation needed] 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; indeed, Johnson is the only Democratic presidential candidate to carry this county in over a century.

Since 2008, Butler County has continually given Republican nominees support in the mid-60s, with both Mitt Romney and Donald Trump receiving around 66% of the vote in 2012, 2016, 2020, and 2024.

The majority of the funding for these libraries comes from state grants, user fines and donations with additional financial contributions from Butler County.

Eventually Lake Pouty spilled over and rushed to the south, carving Slippery Rock Creek Gorge.

Lakes Watts and Edmund drained into the gorge, digging it deeper and making Slippery Rock and Muddy creeks flow south.

Areas of the 400-foot (120 m) deep Slippery Rock Gorge may be seen at nearby McConnells Mill State Park.

The glacier created a landscape of rolling hills topped with hardwood trees and swamps in the valley bottoms.

Moraines containing gravel, sand and clay were draped upon the landscape and silt was left on the extinct lake bottoms.

Reference to: http://www.dcnr.state.pa.us/stateParks/parks/moraine/moraine_history.aspx Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns.

The following cities, boroughs and townships are located in Butler County: Census-designated places are geographical areas designated by the U.S. Census Bureau for the purposes of compiling demographic data.

Several of these communities, most notably Renfrew, Lyndora, Herman, Sarver, Cabot, Boyers, and Forestville, have post offices and zip codes, but aren't officially incorporated under Pennsylvania law, and exist entirely within townships.

Benjamin's Field, a trilogy by local author J. J. Knights[30] The Pennsic War, an annual medieval camping event by the Society for Creative Anachronism, is fought in Butler County.