Zelienople is a borough in Butler County, Pennsylvania, 28 miles (45 km) north of Pittsburgh. The population was 3,812 at the 2010 census.

Beaver County is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 170,539. Its county seat is Beaver. The county was created on March 12, 1800, from parts of Allegheny and Washington Counties. It took its name from the Beaver River.Beaver County is part of the Pittsburgh, PA Metropolitan Statistical Area.

Mercer County is a county located in the U.S. state of Pennsylvania. As of the 2020 census, the population was 110,652. Its county seat is Mercer, and its largest city is Hermitage. The county was created in 1800 and later organized in 1803.Mercer County is included in the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area.

Butler County is a county in the western part of the U.S. state of Pennsylvania. As of the 2010 census, the population was 183,862. Its county seat is Butler. Butler County was created on March 12, 1800, from part of Allegheny County and named in honor of General Richard Butler, a hero of the American Revolution. Butler County is part of the Pittsburgh, PA Metropolitan Statistical Area.