Oscar, Pennsylvania

Greendale is an unincorporated community in Valley Township, Armstrong County, Pennsylvania, United States.

Slabtown is an unincorporated community in Boggs Township, Armstrong County, Pennsylvania, United States. It has also been known as Baum. The community is 9.1 miles (14.6 km) north of Kittanning along Pennsylvania Route 28-Pennsylvania Route 66.

Valley Township is a township that is located in Armstrong County, Pennsylvania, United States. The population was 654 at the time of the 2020 census, a decrease from the figure of 656 that was tabulated in 2010.

West Valley is an unincorporated community in Armstrong County, Pennsylvania, United States.

Pine Furnace is an unincorporated community in Valley Township, Armstrong County, Pennsylvania, United States.

Boggs Township is a township in Armstrong County, Pennsylvania, United States. The population was 813 at the 2020 census, a decrease from the figure of 936 tabulated in 2010.

Pennsylvania State Senate District 41 includes all of Armstrong County and Indiana County and parts of Jefferson County and Westmoreland County. It is currently represented by Republican Joe Pittman.

Armstrong County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 65,558. The county seat is Kittanning. The county was organized on March 12, 1800, from parts of Allegheny, Westmoreland and Lycoming Counties. It was named in honor of John Armstrong, who represented Pennsylvania in the Continental Congress and served as a major general during the Revolutionary War. Armstrong County is included in the Pittsburgh, PA Metropolitan Statistical Area.

Mosgrove is an unincorporated community in Rayburn Township, Armstrong County, Pennsylvania, United States. The community lies along the east side of the Allegheny River, 7.0 miles (11.3 km) north of Kittanning via Pennsylvania Route 66.

Kittanning Township is a township in Armstrong County, Pennsylvania, United States. The population was 2,019 at the 2020 census, a decrease from the figure of 2,265 tabulated in 2010.

Rayburn Township is a township that is located in Armstrong County, Pennsylvania, United States. The population was 1,766 at the time of the 2020 census, a decrease from the figure of 1,907 that was tabulated in 2010.

Allegheny River Lock and Dam No. 8 is a historic lock and fixed-crest dam complex located at Boggs Township and Washington Township in Armstrong County, Pennsylvania. It was built between 1929 and 1931 by the United States Army Corps of Engineers, and consists of the lock, dam, esplanade, and Operations Building. The lock measures 56 feet by 360 feet, and has a lift of 17.8 feet. The dam measures approximately 50 feet high and 916 feet long; a three-foot addition was built on top of the dam in 1937. The Operations Building, or powerhouse, is a utilitarian two-story building in a vernacular early-20th century revival style. The lock and dam were built by the U.S. Army Corps of Engineers as a part of an extensive system of locks and dams to improve navigation along the Allegheny River.It was listed on the National Register of Historic Places in 2000.