List of municipalities in Pennsylvania in the context of "Upper Darby Township, Pennsylvania"

Philadelphia (/ˌfɪləˈdɛlfiə/ FIL-ə-DEL-fee-ə), colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania. It is the sixth-most populous city in the United States with a population of 1.6 million at the 2020 census, while the Philadelphia metropolitan area (sometimes called the Delaware Valley) with 6.33 million residents is the nation's ninth-largest metropolitan area. Philadelphia is known for its culture, cuisine, and history, maintaining contemporary influence in business and industry, culture, sports, and music.

Philadelphia was founded in 1682 by William Penn, an English Quaker and advocate of religious freedom, and served as the capital of the colonial era Province of Pennsylvania. It then played a vital role during the American Revolution and Revolutionary War. It served as the central meeting place for the nation's Founding Fathers in hosting the First Continental Congress (1774) and the Second Continental Congress, during which the Founders formed the Continental Army, elected George Washington as its commander, and adopted the Declaration of Independence on July 4, 1776. During the Revolutionary War's Philadelphia campaign, the city fell to the British Army, which occupied Philadelphia for nine months from September 1777 to June 1778. Following the end of the Revolutionary War, the U.S. Constitution was ratified at the Philadelphia Convention. Philadelphia remained the nation's largest city until 1790, and it served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions until 1800, when construction of the new national capital in Washington, D.C. was completed.

Pittsburgh (/ˈpɪtsbɜːrɡ/ PITS-burg) is a city in Allegheny County, Pennsylvania, United States, and its county seat. Located in southwestern Pennsylvania where the Allegheny and Monongahela Rivers meet to form the Ohio River, it had a population of 302,971 at the 2020 census, making it the second-most populous city in Pennsylvania. The Pittsburgh metropolitan area has over 2.43 million people, making it the largest in the Ohio Valley and Appalachia, the second-largest in Pennsylvania, and the 28th-largest in the U.S. The greater Pittsburgh–Weirton–Steubenville combined statistical area includes parts of Ohio and West Virginia.

Pittsburgh is known as "the Steel City" for its dominant role in the history of the U.S. steel industry. It developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains led to the region being contested by the French and British empires, Virginians, Whiskey Rebels, and Civil War raiders. For part of the 20th century, Pittsburgh was behind only New York City and Chicago in corporate headquarters employment; it had the most U.S. stockholders per capita. Deindustrialization in the late 20th century resulted in massive layoffs among blue-collar workers as steel and other heavy industries declined, coinciding with several Pittsburgh-based corporations moving out of the city. However, the city divested from steel and, since the 1990s, Pittsburgh has focused its energies on the healthcare, education, and technology industries.

Scranton is a second A class city in and the county seat of Lackawanna County, Pennsylvania, United States. With a population of 76,328 at the 2020 census, Scranton is the sixth-most populous city in Pennsylvania and the most populous city in Northeastern Pennsylvania. It is part of the Wyoming Valley metropolitan area, which includes five cities and more than 40 boroughs forming a contiguous urban corridor with an estimated 574,000 residents. It is located 56 miles (90 km) north of Allentown, 104 miles (167 km) north-northwest of Philadelphia, and 99 miles (159 km) west-northwest of New York City.

Scranton is located in the Lackawanna River valley and was historically the largest of several anthracite coal mining communities in the area, including Wilkes-Barre and Nanticoke. It was incorporated as a borough in 1856 and as a city in 1866, later becoming the seat of the newly formed Lackawanna County in 1878. The city contains a federal courthouse for the United States District Court for the Middle District of Pennsylvania and is conventionally divided into nine districts, namely North Scranton, Southside, Westside, Eastside/Hill Section, Central City, Minooka, West Mountain, East Mountain, and Green Ridge.

Reading (/ˈrɛdɪŋ/ RED-ing; Pennsylvania German: Reddin) is a city in Berks County, Pennsylvania, United States, and its county seat. The city had a population of 95,112 at the 2020 census and is the fourth-most populous city in Pennsylvania after Philadelphia, Pittsburgh, and Allentown. Reading is located in the southeastern part of the state and is the principal city of the Greater Reading area, which had 420,152 residents in 2020.

Reading gives its name to the now-defunct Reading Company, also known as the Reading Railroad and since acquired by Conrail, that played a vital role in transporting anthracite coal from Pennsylvania's Coal Region to major East Coast markets through the Port of Philadelphia for much of the 19th and 20th centuries. Reading Railroad is one of the four railroad properties in the classic U.S. version of the Monopoly board game. Reading was one of the first localities where outlet shopping became a tourist industry. It has been known as "The Pretzel City" because numerous local pretzel bakeries are based in the city and its suburbs; currently, Bachman, Dieffenbach, Tom Sturgis, and Unique Pretzel bakeries call the Reading area home. In recent years, the Reading area has become a destination for cyclists with more than 125 miles (201 km) of trails in five major preserves; the region is an International Mountain Bicycling Association ride center.

Local government in Pennsylvania is government below the state level in Pennsylvania. There are six types of local governments listed in the Pennsylvania Constitution: county, township, borough, town, city, and school district. All of Pennsylvania is included in one of the state's 67 counties, which are in total subdivided into 2,560 municipalities. There are currently no independent cities or unincorporated territories within Pennsylvania. There is only one incorporated town in Pennsylvania, Bloomsburg.

Allentown (Pennsylvania Dutch: Allenschteddel, Allenschtadt, or Ellsdaun) is a city in the U.S. state of Pennsylvania. It is the county seat of Lehigh County, and is the third-most populous city in Pennsylvania, with a population of 125,845 as of the 2020 census. It is also the most populous city in the Lehigh Valley metropolitan area of eastern Pennsylvania, which had a population of 861,899 and was the 68th-most populous metropolitan area in the nation as of 2020.

Founded in 1762, Allentown is located on the Lehigh River, a 109-mile-long (175 km) tributary of the Delaware River. It is the largest of three adjacent cities, including Bethlehem and Easton in Lehigh and Northampton counties, in the Lehigh Valley region. Allentown is located 48 miles (77 km) north of Philadelphia and 78 miles (126 km) west of New York City.

Erie is a city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States. It is the fifth-most populous city in Pennsylvania and the most populous in Northwestern Pennsylvania with a population of 94,831 at the 2020 census. The two-county Erie Metropolitan Area had a population of 270,876 in 2020. Erie is about 80 miles (130 km) from Buffalo, 90 miles (140 km) from Cleveland, and 120 miles (190 km) from Pittsburgh.

The city takes its name from the Native American Erie people, who inhabited the area until the mid-17th century. Its nicknames include "Gem City", a reference to its fine natural harbor, the "Gem of the Great Lakes"; and more recently, "Flagship City", from a local marketing effort to play up the homeport of Oliver Hazard Perry's flagship Niagara.