Skip to content
— CH. 1 · INTRODUCTION —

Philadelphia

~10 min read · Ch. 1 of 7
7 sections
  • Philadelphia sits on a narrow strip of land between the Delaware and Schuylkill rivers, and in the summer of 1776, the men gathered there made a decision that would be quoted by freedom movements around the world for the next two and a half centuries. The Declaration of Independence, adopted on the 4th of July 1776, inside what was then called Pennsylvania State House, was described by Pulitzer Prize-winning historian Joseph Ellis as "the most potent and consequential words in American history." This was not a neutral city. It was the place William Penn chose in 1682, naming it from the Greek for brotherly love, and it became the crucible in which the United States was first imagined, debated, and built.

    But Philadelphia's story did not end when the capital moved to Washington, D.C. in 1800. The city that gave America its first library, first hospital, first medical school, first zoo, and first business school kept generating firsts long after the founding era. By the 20th century it had developed a distinctive sound in American music, a devoted and notoriously passionate sports culture, and an urban crisis that nearly broke it before a long, uneven recovery began. How a city named for brotherly love became one of the nation's most complex, contradictory, and resilient places is a story worth following all the way through.

  • William Penn received his charter from Charles II of England in 1681, in partial repayment of a debt owed to Penn's family. Rather than simply claim the land, Penn bought it from the local Lenape people, making a treaty of friendship with Lenape chief Tammany under an elm tree at Shackamaxon, in what is now the Fishtown neighborhood. Penn's Quaker background had exposed him to religious persecution, and he designed the colony as a place where anyone could worship freely. That tolerance exceeded what other colonies offered, and it drew immigrants rapidly.

    Penn laid out his new city on a grid between the two rivers, naming east-west streets after local trees, with plans for five public parks at intervals across the grid. He envisioned something more like an English rural town than a dense port city, with houses well separated by gardens and orchards. His own inhabitants ignored this vision almost immediately. They crowded onto the Delaware waterfront, subdivided their lots, and built the bustling trading center Penn had tried to prevent. Before he left Philadelphia for the final time, Penn issued the Charter of 1701, formally establishing it as a city. Within a few decades it had surpassed Boston as the largest city and busiest port in British America, and the second-largest city in the entire British Empire after London.

    Benjamin Franklin, the city's most celebrated citizen, helped transform Philadelphia's civic life. He founded a fire company, a library, and a hospital, several of which were the first of their kind in the nation. Philosophical societies followed, including the Academy of Natural Sciences in 1812 and the Franklin Institute in 1824. Those societies attracted skilled European immigrants and financed new industries, setting a pattern of intellectual and commercial ambition that would define the city for generations.

  • In 1774, as resentment toward British policies sharpened across the colonies, Philadelphia hosted the First Continental Congress at Carpenters' Hall, drawing delegates from 12 of the original 13 colonies. Thomas Jefferson drafted the Declaration predominantly from his second-floor apartment on Market Street, within walking distance of Independence Hall. The 56 delegates of the Second Continental Congress unanimously adopted it on the 4th of July 1776, and since that day, it has been cited globally by peoples seeking independence and liberty. The celebration of that adoption was formalized as Independence Day in 1938, one of only eleven designated U.S. federal holidays.

    The British were not content to let Philadelphia remain a symbol of rebellion. After George Washington's defeat at the Battle of Brandywine on the 11th of September 1777, the city lay defenseless. The Liberty Bell, then known as the Pennsylvania State Bell, was taken down along with bells from Christ Church and St. Peter's Church and transported by a heavily guarded wagon train to Zion German Reformed Church in Northampton Town, present-day Allentown, where it was hidden under the church's floorboards for nine months. British forces occupied Philadelphia from September 1777 to June 1778.

    During the occupation, two battles were fought within the city's limits: the Siege of Fort Mifflin, between September 26 and the 16th of November 1777, and the Battle of Germantown on the 4th of October 1777. The Second Continental Congress, by then meeting elsewhere, adopted the Articles of Confederation on the 15th of November 1777. Independence Hall later served as the meeting place for the Constitutional Convention, which ratified the Constitution on the 17th of September 1787. That document is now the longest-standing codified national constitution in the world.

    In 1793, yellow fever killed approximately 4,000 to 5,000 people in Philadelphia, roughly ten percent of the city's population at the time, in the largest epidemic of the disease in U.S. history. The national capital moved to Washington, D.C. in 1800 when the White House and Capitol were completed, and in 1812 the state capital moved from Lancaster to Harrisburg. Philadelphia had served as the nation's capital on five occasions between 1775 and 1790 and for a decade from 1790 to 1800.

  • Through the 19th century, Philadelphia became the first major industrial city in the United States, with large-scale road, canal, and railroad construction driving growth. The largest industry was textiles, and major corporations of the era included Baldwin Locomotive Works, William Cramp and Sons Shipbuilding Company, and the Pennsylvania Railroad. Immigrants mostly from Ireland and Germany settled the city and surrounding districts, and in 1835 workers in the city won the ten-hour workday in what is considered the first general strike in North America.

    Irish immigrants fleeing the Great Famine arrived in the 1840s, settling south of South Street and establishing Catholic churches and schools. Anti-Irish, anti-Catholic nativist riots erupted in 1844. The city's growing population in surrounding districts led to the Act of Consolidation of 1854, which extended city limits from the 2 square miles of Center City to roughly 134 square miles. The African American population grew from 31,699 to 219,559 between 1880 and 1930, largely driven by the Great Migration from the South.

    In 1816, Philadelphia's free Black community founded the African Methodist Episcopal Church, the first independent Black denomination in the country. In July 1919, Philadelphia was among more than 36 industrial cities to experience racial violence during the Red Summer of post-World War I unrest. Prohibition brought organized crime and corrupt police; in the 1920s, Brigadier General Smedley Butler of the U.S. Marine Corps was appointed the city's director of public safety in response, though political pressure prevented lasting results.

    The population peaked at more than two million residents in 1950, then declined as manufacturing contracted and affluent residents moved to suburban communities. By the late 1980s the city approached bankruptcy. The most shocking episode of the late 20th century came in 1985 when the Philadelphia Police Department, using a Pennsylvania State Police helicopter, bombed the Cobbs Creek neighborhood to execute arrest warrants on members of MOVE, a Black liberation movement. The incident killed 11 people, destroyed 61 homes, and displaced 250 residents, marking one of the only times a U.S. city intentionally bombed its own civilians.

  • In 1952, a teen dance party program called Bandstand premiered on local Philadelphia television, hosted by Bob Horn. The show was renamed American Bandstand in 1957 when it began national syndication on ABC, hosted by Dick Clark and produced in Philadelphia until 1964 before moving to Los Angeles. Philadelphia-born singers including Frankie Avalon, James Darren, Eddie Fisher, Fabian Forte, Bobby Rydell, and South Philly-raised Chubby Checker topped the music charts during this era.

    Philly soul music of the late 1960s and 1970s was a highly produced form of soul that influenced later popular music including disco and urban contemporary rhythm and blues. On the 13th of July 1985, John F. Kennedy Stadium served as the American venue for Live Aid. Twenty years later, the Live 8 concert drew about 700,000 people to the Benjamin Franklin Parkway on the 2nd of July 2005. Notable rock and pop musicians from the city and its suburbs include Hall and Oates, Todd Rundgren, DJ Jazzy Jeff and the Fresh Prince, the Roots, Meek Mill, and Pink, among others.

    The Philadelphia Orchestra is considered one of the top five orchestras in the United States. Opera Philadelphia performs at the Academy of Music, the nation's oldest continually operating opera house. The Curtis Institute of Music ranks as one of the world's premier conservatories and among the most selective institutes of higher education anywhere. The city also hosts the Kimmel Center for the Performing Arts, home to both the Philadelphia Orchestra and the Philly Pops, which plays orchestral versions of jazz, swing, Broadway, and blues. The Walnut Street Theatre, founded in 1809 and a National Historic Landmark, is described as the oldest and most subscribed-to theatre in the English-speaking world.

  • Philadelphia's first professional sports team, the Philadelphia Athletics, was founded in 1860. In 1876, the Athletics joined seven other teams in founding the National League, now the longest continuously operating sports league in the world. The Phillies, formed in 1883 as the Quakers, are the oldest team continuously playing under the same name in the same city in American professional sports history. Philadelphia is one of 12 U.S. cities to field teams in all four major professional leagues simultaneously.

    Following the 76ers' victory over the Los Angeles Lakers in the 1983 NBA Finals, the city went 25 years without a championship in any professional sport until the Phillies won the 2008 World Series, defeating the Tampa Bay Rays. This drought became known as the Curse of Billy Penn, a reference to a 1987 decision that permitted One Liberty Place to become the first building in city history to surpass the height of the statue of William Penn, installed in 1894 atop City Hall. During the drought, in 2004, ESPN ranked Philadelphia second on its list of the fifteen most tortured sports cities.

    Philadelphia's fans are among the most discussed in American sports, sometimes praised for their passion and sometimes criticized for their behavior. In 2011, GQ magazine named Eagles and Phillies fans the worst professional sports fans in the nation. After the Phillies broke the championship drought in 2008, the Eagles won their first Super Bowl following the 2017 season, defeating the New England Patriots in Super Bowl LII. Following the 2024 season, the Eagles won a second Super Bowl, defeating the Kansas City Chiefs in Super Bowl LIX. Philadelphia will also host matches as one of eleven U.S. cities for the 2026 FIFA World Cup.

  • The list of American firsts that Philadelphia can claim is not a footnote but a defining feature of the city. The nation's first library was established in 1731. The first hospital opened in 1751. The first medical school began in 1765. By some accounts, the first university followed in 1779. The nation's first central bank opened in 1781, the first stock exchange in 1790, the first zoo in 1874, and the first business school in 1881. The Philadelphia Stock Exchange, owned by Nasdaq since 2008, remains a global leader in options trading.

    Philadelphia also has more public art than any other American city. In 1872, the Association for Public Art, then called the Fairmount Park Art Association, became the first private association in the United States dedicated to integrating public art and urban planning. In 1959, lobbying helped create the Percent for Art ordinance, the first such ordinance for any U.S. city. The Mural Arts Program, created in 1984, has funded more than 2,800 murals and educated more than 20,000 young people in underserved neighborhoods.

    The city hosts 67 National Historic Landmarks, more than almost any other U.S. city, including Independence Hall and the Liberty Bell. Independence National Historical Park received over 5 million visitors in 2016. The Philadelphia metropolitan area, sometimes called the Delaware Valley, carries a gross metropolitan product of US$557.6 billion, ranks as one of the nation's Big Five venture capital hubs, and has earned the nickname Cellicon Valley for its central role in developing immunotherapies to treat cancer. Fairmount Park, combined with the adjacent Wissahickon Valley Park, covers 2,052 acres and ranks as the world's 55th largest urban park, preserving within the city the same green ambition that William Penn sketched out on paper more than three centuries ago.

Common questions

Who founded Philadelphia and when?

Philadelphia was founded in 1682 by William Penn, an English Quaker and advocate of religious freedom. Penn received a charter from Charles II of England in 1681 in partial repayment of a debt and purchased the land from the local Lenape people before establishing the city.

What does the name Philadelphia mean?

Philadelphia is derived from two Ancient Greek terms: phílos, meaning beloved or dear, and adelphós, meaning brother or brotherly. The name translates as brotherly love, a reflection of William Penn's Quaker values and his vision for a tolerant colony.

What role did Philadelphia play in the American Revolution?

Philadelphia hosted both the First Continental Congress in 1774 and the Second Continental Congress, during which the Declaration of Independence was adopted on the 4th of July 1776. The city was also occupied by British forces for nine months from September 1777 to June 1778, and Independence Hall later served as the site where the U.S. Constitution was ratified on the 17th of September 1787.

What is the Curse of Billy Penn in Philadelphia sports?

The Curse of Billy Penn refers to the 25-year championship drought Philadelphia sports teams endured after the 76ers won the 1983 NBA Finals. The drought was linked to a 1987 decision permitting One Liberty Place to become the first building to surpass the height of the statue of William Penn atop City Hall, installed in 1894. The Phillies ended the drought by winning the 2008 World Series.

What are Philadelphia's most notable firsts in American history?

Philadelphia claims the nation's first library (1731), first hospital (1751), first medical school (1765), first central bank (1781), first stock exchange (1790), first zoo (1874), and first business school (1881). The city also hosted the First Continental Congress in 1774 and served as the nation's first capital.

What happened during the 1985 MOVE bombing in Philadelphia?

In 1985, the Philadelphia Police Department used a Pennsylvania State Police helicopter to bomb the Cobbs Creek neighborhood in order to execute arrest warrants on members of MOVE, a Black liberation movement. The incident killed 11 people, destroyed 61 homes, and displaced 250 residents, marking one of the only times a U.S. city intentionally bombed its own civilians.

All sources

372 references cited across the entry

  1. 1webBehind Philadelphia Maneto: Dissecting The City SealSam Robinson — November 5, 2013
  2. 2webPlaque Dedication Marks 120th Anniversary of Creation of Philadelphia's FlagJohn McDevitt — CBS Broadcasting Inc. — May 5, 2015
  3. 3webArcGIS REST Services DirectoryUnited States Census Bureau
  4. 4webCensus Population APIUnited States Census Bureau
  5. 5web2020 Population and Housing State DataUnited States Census Bureau
  6. 6webList of 2020 Census Urban AreasUnited States Census Bureau
  7. 8webUS Board on Geographic NamesUnited States Geological Survey — February 2, 2015
  8. 9webQuickFacts: Philadelphia city, PennsylvaniaUnited States Census Bureau
  9. 10webQuickFacts Philadelphia County, PennsylvaniaUnited States Census Bureau
  10. 13webThe Sounds of PhiladelphiaPhiladelphia Convention & Visitors Bureau — February 22, 2006
  11. 14bookInsight Guides: Philadelphia and SurroundingsKarin Brookes — APA Publications — 2005
  12. 15bookAmerican Creation: Triumphs and Tragedies at the Founding of the RepublicJoseph Ellis — Knopf — 2007
  13. 17webPhiladelphiaLaura Tucker — QS Quacquarelli Symonds Limited — November 25, 2014
  14. 18webPhiladelphia Becomes First World Heritage City in USMichael A. Sisak — ABC News Internet Ventures — November 6, 2015
  15. 19webGateway to Public Art in PhiladelphiaFairmount Park Art Association — August 10, 2011
  16. 20webMural Arts Philadelphia – Press kitMural Arts Philadelphia
  17. 21web2014 City Park FactsThe Trust for Public Land
  18. 24journalPhiladelphia is the best city for sports fansSandy Hingston — December 7, 2019
  19. 25newsWhat Philly--and Philly sports fans--taught me about fandomStephanie Farr — October 21, 2022
  20. 26webPhilly: the best sports city in AmericaAndrew Ziperski — April 26, 2018
  21. 30webQ2 2024Savanna Maloney — PitchBook-NVCA Venture Monitor — July 11, 2024
  22. 32webPhiladelphia Semiconductor Index (SOX)Dotdash Meredith — May 19, 2022
  23. 34webPhilaPort The Port of PhiladelphiaPhiladelphia Regional Port Authority
  24. 39bookThe Bank of North America, Philadelphia, a national bank, founded 1781John H. Michener — R. G. Cooke, Inc. — 1906
  25. 40webAbout the Philadelphia ZooPhiladelphia Zoo
  26. 41webAbout WhartonThe Wharton School of the University of Pennsylvania
  27. 44bookThe Ambiguous Iroquois Empire: The Covenant Chain Confederation of Indian Tribes with English Colonies from Its Beginnings to the Lancaster Treaty of 1744Francis Jennings — W. W. Norton & Company — 1984
  28. 46bookInsight Guides: Philadelphia and Surroundings
  29. 47bookPhiladelphia: A 300-Year HistoryW. W. Norton & Company — 1982
  30. 48bookA Concise History of PhiladelphiaRon Avery — Otis Books — 1999
  31. 49bookPhiladelphia: A 300-Year HistoryW. W. Norton & Company — 1982
  32. 50webExplore PA History websiteExplorepahistory.com
  33. 51bookGeography: USAAlan A. Lew — Northern Arizona University — 2004
  34. 52bookRobert Morris: Financier of the American RevolutionCharles Rappleye — Simon and Schuster — 2010
  35. 53webView of Philadelphia, Circa 1770World Digital Library — 1770
  36. 55webA Short History of Yellow Fever in the USBob Arnebeck — January 30, 2008
  37. 56bookPhiladelphia: A 300-Year HistoryW. W. Norton & Company — 1982
  38. 60webDetroit and the Great Migration, 1916–1929 by Elizabeth Anne MartinBentley Historical Library, University of Michigan — July 5, 2007
  39. 65webI'm From Philly. 30 Years Later, I'm Still Trying To Make Sense Of The MOVE BombingGene Demby — National Public Radio, Inc. — May 13, 2015
  40. 66webCensus: Phila. keeps on growingDylan Purcell et al. — March 14, 2013
  41. 67webQuickFacts Philadelphia County, PennsylvaniaUnited States Census Bureau
  42. 70web2016 U.S. Gazetteer FilesUnited States Census Bureau
  43. 71webThe National MapU.S. Geological Survey
  44. 75webA Guide To Philadelphia's 'Squares'CBS Philly — February 4, 2011
  45. 78webFranklin Square HistoryHistoric Philadelphia
  46. 81webPhiladelphia 2035: The Comprehensive PlanPhiladelphia City Planning Commission
  47. 84bookPhiladelphia: A 300-Year History
  48. 87journalBreaking GroundJoanne Aitken — June 3–19, 2004
  49. 90webNational Register of Historic Places – Fairmount Park – #72001151National Park Service — February 7, 1972
  50. 93webPhiladelphia (KPHL) Climate ArchiveNational Oceanic and Atmospheric Administration
  51. 94newsOne wild storm: A look back at the 'Blizzard of '96'Don Lipman — January 7, 2013
  52. 101webPhiladelphia County – State of the Air 2017American Lung Association
  53. 102webMost Polluted CitiesAmerican Lung Association
  54. 105webExplore Census DataUnited States Census Bureau
  55. 107webProfile of General Population and Housing Characteristics: 2010 2010 Demographic Profile Data (Public Law 94-171) Summary FileAmerican FactFinder, United States Census Bureau — U.S. Census Bureau, 2010 Census
  56. 109webHow Does the Census 2000 Question on Race Differ from the 1990 Question?United States Census Bureau — census.gov
  57. 113webPhiladelphia immigrationAugust 5, 2013
  58. 117webLatino Philadelphia at a GlanceLatino Philadelphia
  59. 121webRecent Immigration to Philadelphia: Regional Change in a Re-Emerging GatewayAudrey Singer et al. — Brookings Institution
  60. 122webExploring Gay PhiladelphiaVisit Philadelphia
  61. 123webGuide to Philadelphia's GayborhoodCBS Local Media — June 5, 2013
  62. 125webAmerica's Changing Religious LandscapePew Research Center: Religion & Public Life — May 12, 2015
  63. 126encyclopediaPhiladelphia
  64. 127webGroup: Remains of more than 500 animals found at Philadelphia homeRoss Levitt — CNN — December 30, 2009
  65. 129webPhiladelphia County, PennsylvaniaModern Language Association
  66. 131webA growing need for food reliefNovember 16, 2010
  67. 132webRelief agencies feel hunger pangsNatalie Pompilio — November 16, 2010
  68. 135webFortune 500Fortune
  69. 136webWhy You Should Start a Business in PhiladelphiaFransmart News — November 8, 2021
  70. 137webGross domestic product (GDP) by metropolitan areaU.S. Bureau of Economic Analysis
  71. 138webGross domestic product (GDP) by metropolitan areaU.S. Bureau of Economic Analysis — September 18, 2018
  72. 139webIs Philadelphia's biotech cluster faltering? Experts say noDaniel Eramian — November 2, 2020
  73. 149webAbout Penn Medicine: HistoryPenn Medicine
  74. 150webPhiladelphia Park System HistoryCity of Philadelphia
  75. 154journalPhilly goes the distanceJerome Weeks — August 2006
  76. 160webPublic ArtGreater Philadelphia Tourism Marketing Corporation
  77. 161journalForget ParisJoanne Aitken — September 2, 2004
  78. 162webAbout A Brief History of Percent-For-Art in AmericaJohn Wetenhall — Public Art Review
  79. 167magazineArt: WindfallJanuary 15, 1940
  80. 168journalThe Early Career of Violet Oakley, IllustratorBailey Van Hook — January 1, 2009
  81. 170webRick's Steaks takes Reading Terminal Market dispute to courtKatie Stuhldreher — philly.com — July 30, 2007
  82. 176webMcGillin's HistoryMcGillin's Olde Ale House
  83. 179webReading Terminal Market: About the marketReading Terminal Market
  84. 181journalInterview with William LabovMatthew J. Gordon — 2006
  85. 183newsAn earful and accent that's distinctly PhillyMo Rocca — CBS Interactive Inc. — July 26, 2016
  86. 184webPhilly SlangPhillyTalk.com
  87. 187webAbout UsPhiladelphia Boys Choir
  88. 188webAbout The Philly POPSEncore Series, Inc. — January 13, 2015
  89. 193webLive 8 Philadelphia ReviewJuly 2, 2005
  90. 196bookThe Team-by-Team Encyclopedia of Major League BaseballDennis Purdy — Workman — 2006
  91. 197webHistory: Phillies Timeline (1800s)Philadelphia Phillies
  92. 204webLifting the curse of William PennMichael Matza — October 22, 2008
  93. 206webPhilly reels from loss to BlackhawksRavi Baichwal — abclocal.go.com — June 10, 2010
  94. 209newsEagles QB Nick Foles wins Super Bowl LII MVPJeremy Bergman — National Football League — February 4, 2018
  95. 210webBehind The Name – WarriorsNational Basketball Association — May 10, 2015
  96. 211bookMovin' on Up: Baseball and Phialdephia Then, Now, and AlwaysTom Burgoyne — B B& A Publishers — 2004
  97. 214webBoathouse RowA View on Cities
  98. 215webAbout the Dad Vail RegattaDad Vail Regatta Organizing Committee
  99. 218webHead of the Schuylkill Regatta History and GrowthHead of the Schuylkill Regatta
  100. 219webBoathouse Row ClubsSchuylkill Navy & Boathouse Row
  101. 229webPhiladelphia Home Rule Charter, AnnotatedCharter Commission — City of Philadelphia — 1967
  102. 230webCity Charter CommissionCity of Philadelphia, Department of Records — November 8, 2000
  103. 236webMunicipalCourtFebruary 11, 2010
  104. 248webCouncil MembersNovember 17, 2015
  105. 251webOpen Wards for AllJon Geeting — August 18, 2018
  106. 252newsGetting out the vote is their jobJuliana Feliciano Reyes et al. — March 27, 2022
  107. 253bookGreen Shoots of DemocracyKaren Bojar — She Writes Press — 2016
  108. 254webVoter registration statistics by countyPennsylvania Department of State — December 18, 2023
  109. 259webCongressional Apportionment 2010 Census BriefsUnited States Census Bureau — November 2011
  110. 265webSenator Arlen Specter to Teach At Penn LawThe University of Pennsylvania School of Law
  111. 268newsPolitically Uncorrected: Presidential nominees and Philadelphia conventionsG. Terry Madonna — Daily Local News — February 13, 2015
  112. 269webGeorge M. Dallas (1845–1849) – Vice PresidentMiller Center of Public Affairs, University of Virginia — October 4, 2016
  113. 273webPhiladelphia 2015: The State of the CityThe Pew Charitable Trusts — March 2015
  114. 274webPhiladelphia Homicides 1960-2020February 10, 2021
  115. 275journalFour killings put 2006 total over '05 topJoel Bewley et al. — December 11, 2006
  116. 285newsAbout Us – The School District of PhiladelphiaPhiladelphia School District
  117. 289newsAmerica's Leading College TownsThe Atlantic: City Lab — August 27, 2012
  118. 290bookBuilding America's First University: An Historical and Architectural Guide to the University of PennsylvaniaDavid B. Brownlee et al. — University of Pennsylvania Press — 2000
  119. 291webThe Phila. area's biggest collegesPhiladelphia Business Journal — October 21, 2011
  120. 293webThe History of the Philadelphia InquirerGerry Wilkinson — Philadelphia Press Association
  121. 294journalDaily News to be labeled edition of Inquirer; no change to content, staffDave Davies — March 2, 2009
  122. 309journalThe Media: One revolution after anotherTodd Bishop — January 7, 2000
  123. 317bookLegacy: A Biography of Moses and Walter AnnenbergChristopher Ogden — Little, Brown and Company — 1999
  124. 318webMarket Name: Philadelphia, PATelevision Bureau of Advertising, Inc.
  125. 321bookThe Road from Upper Darby. The Story of the Market Street Subway-Elevated.Harold E. Cox — Electric Railroaders' Association — 1967
  126. 323newsSEPTA Budget for Fiscal 1993: Continued Rail RetrenchmentMatthew Mitchell — April 1992
  127. 324webThe Delaware Valley Rail PassengerDelaware Valley Association of Rail Passengers — June 8, 1992
  128. 326webCommonwealth of Pennsylvania FY2017 Fact SheetAmtrak/National Railroad Passenger Corporation — November 2017
  129. 335webWilliam Penn Plans the CityThe University of Virginia
  130. 337webHistory of the Blue RoutePennsylvania Department of Transportation
  131. 350webFairmount Water Works: Our StoryFairmount Water Works
  132. 351webAbout Philadelphia WaterCity of Philadelphia
  133. 352webPECO: Company InformationPECO Energy Company
  134. 354webPGW: About UsPhiladelphia Gas Works
  135. 359webFlorence, ItalyCitizen Diplomacy International Philadelphia
  136. 360webTel Aviv, IsraelCitizen Diplomacy International Philadelphia
  137. 361webTorun, PolandCitizen Diplomacy International Philadelphia
  138. 362webTianjin, ChinaCitizen Diplomacy International Philadelphia
  139. 363webIncheon, KoreaCitizen Diplomacy International Philadelphia
  140. 364webDouala, CameroonCitizen Diplomacy International Philadelphia
  141. 365webNizhny Novgorod, RussiaCitizen Diplomacy International Philadelphia
  142. 366webFrankfurt am Main, GermanyCitizen Diplomacy International Philadelphia
  143. 367webKobe, JapanCitizen Diplomacy International Philadelphia
  144. 368webAbruzzo, ItalyInternational Visitors Council of Philadelphia
  145. 369webAix-en-Provence, FranceCitizen Diplomacy International Philadelphia
  146. 370webCitizen Diplomacy International Philadelphia Sister Cities ProgramCitizen Diplomacy International Philadelphia
  147. 371webSister Cities ParkInternational Visitors Council of Philadelphia
  148. 372webSister Cities Park HistoryCenter City DistrictCentral Philadelphia Development CorporationCenter City District Foundation