Historical Markers in
Allegheny County, Pennsylvania

1892 Homestead Strike Memorial 1909 McKee's Rocks Strike 1st Drive-In Filling Station 841 Lincoln Avenue A Gift from Henry Clay Frick All Saints Church Allegheny Arsenal Allegheny Cemetery Allegheny Cotton Mill Strikes Allegheny Country Club Allegheny County Allegheny County Allegheny County Courthouse and Jail Allegheny County Soldier's Monument Allegheny High School Allegheny Observatory Allegheny Post Office Allegheny Soldiers' Lot Andrew Carnegie Andrew Stephen McSwigan Anthony Sadowski Aria Cultural District Lofts Arrott Building Art Blakey Arthur J. Rooney Atwell-Christy House August Wilson Auto Race Avery College Barney Dreyfuss Benedum-Trees Building Bessemer Converter Bethel A.M.E. Church Bethel Presbyterian Church Beulah Chapel Billy Eckstine Birthplace of Gertrude Stein Birthplace of the Aluminum Industry Borough of Bradford Woods Borough of Dormont Pool Bost Building Bouquet Camp Bower Hill Braddock Carnegie Library Braddock's Crossing Braddock's Defeat Braddock's Field Braddock’s Crossing Brown Chapel AME Church Buhl Planetarium and Institute of Popular Science Burke's Landmark Burtner House Butler Short Line Butler Short Line Byers-Lyon House Calvary Episcopal Church Calvary United Methodist Church Capt. Frederick Way, Jr. Carnegie Hero Fund Commission Carnegie Library of Homestead Carnegie Library of Homestead Swim Team Catahecassa, Blackhoof Charles Martin Hall Charles Taze Russell Chartier's Old Town Chiodo's Tavern Clayton Clinton Furnace Colonel George Washington Monument Colonial Place Historic District Congregation B'nai Israel Corliss Street Tunnel Count Noble / Mildmay Park Beauty County of Allegheny Law Enforcement Officers Memorial County Office Building Crawford Grill D.T. Watson Home for Crippled Children Daisy E. Lampkin David L. Lawrence David McKee Davis Island Lock and Dam Depreciation Lands Survey Depreciation Lands Survey Dorothy Mae Richardson Dravo Corporation Shipyard Duquesne Incline Duquesne Steel Works Duquesne University E & O Brewery E.V. Babcock-The Father of Allegheny County Parks / Creation - Ecology - Culture Early Land Use East Liberty Presbyterian Church Edgar Thomson Plant Edith Darlington Ammon Elias Fry Barn Elizabeth Epiphany Roman Catholic Church Ethelbert Nevin Family Court Facility Ferry Landing First Aluminum Observatory Dome First Free Public Library Building in the United States First Mining of Pittsburgh Coal First Muslim Mosque of Pittsburgh First Professional Football Game First United Methodist Church First World Series Flatiron Building Forbes Field Forbes Road Forbes Road Forbes Road, 1758 Forks of the Ohio Fort Pitt Blockhouse Fort Duquesne Fort Lafayette Fort Reburn Fort Vance Founding Convention of the AFL Founding Convention of the CIO Founding of the Ironworkers Union Fourth Ward Memorial Frances Perkins Frank Conrad Frank E. Bolden Frank Vittor Frederick Ingersoll Frederick J Osterling Office & Studio Freedom House Ambulance Frick Family Frick Park Today Frick Woods Nature Preserve From Slavery to Freedom Garden General Matthew B. Ridgway George Adam Weddell George Was Here George Westinghouse George Westinghouse Memorial Glenfield War Memorial Gold Star Mothers Memorial Grace United Methodist Church Grant's Hill Great Strike Ignites the Nation! Greenfield Veterans Memorial Greenhouse Greenlee Field Greenstone United Methodist Church Gulf Building Guyasuta Hampton Battery Monument Hand's Hospital Harwick Miners Memorial Hazelwood: A Rivertown Rich in History Heidelberg Raceway and Sports Arena Heinz Hall Helen Richey Henry Clay Frick Henry J. Heinz Herb Scott Herr's Island Hiland Presbyterian Church Historic Site in Journalism History / Restoration History of Observatory Hill Homestead Strike Homestead Strike Victims Honus Wagner Hyeholde In Honor of Service In Memory of All Korean War Veterans In Memory of Eric S. Holman, Staff Sergeant, U.S. Army In Memory of John (Jack) Brennan Influential Figures J.P. "Honus" Wagner James Hay Reed Jane Grey Swisshelm Jane Grey Swisshelm Childhood Home Jane Holmes Joe Magarac • 1940 John A. Roebling John M. Phillips John Scull John T. Comès Johnny Unitas Johnson Studio Jonas Salk Jones and Laughlin Jones Hall Joshua (Josh) Gibson Joshua Meeks Kaufmann's Department Store and Clock Kennedy-Nixon Taft-Hartley Debate Kenny Memorial Field Flagpole Kennywood Park Kennywood's Thunderbolt Kier Refinery Kitchen Garden Korean War Veterans' Monument Kuskusky Path Laffin' Sal Lance Corporal Patrick B. Kenny Langley Observatory Clock Le Magnifique Leetsdale Veterans Memorial Lewis and Clark Expedition Linhart Homestead Linwood Apartments Lois Weber Louis Mason, Jr Mala Jaska Maria Sklodowska Curie Martha Graham Martin R. Delany Mary Cassatt Mary Harris "Mother" Jones Mary Lou Williams Materials Handling McClurg Iron Foundry McKees Rocks Mound Mellon Park Mellon Square Merchants Savings & Trust Company Mercy Hospital Michael A. Musmanno Miniature Railroad Monongahela River Navigation System Monongahela Wharf Commercial Buildings Monongahela's First Lock & Dam Moon Township September 11th Memorial Mooncrest Motor Square Garden Mount Assisi Mt. Lebanon Municipal Building Mt. Nebo U.P. Church War Memorial National Carpatho-Rusyn Cultural and Educational Center National Negro Opera Company National P.O.W.-M.I.A. Recognition Day National Tube Works Neville House Nevin Row Ninth Street Bridge Noah's Ark Oakmont Carnegie Library Old Allegheny Market House Old Saint Luke's Church Old Sewickley Post Office On This Site Open Hearth Steel Original Settler's Cabin Original Site of the Baseball Diamond Orr's Block House Our Lady of Lourdes Grotto Park Development Pat the Avenger Returns Fire Pennsylvania Canal Perry's Hall Pioneer Short-Wave Station Pittsburgh Pittsburgh Pittsburgh Brewing Company Pittsburgh Glass Works Pittsburgh Grease Plant Pittsburgh Plate Glass Company Pittsburgh's Grand Hall at the Priory Playhouse Pledge of Allegiance Polish Army Portal of Industry Prehistoric Rivers Presston Queen Aliquippa Rachel Carson Radio Station KDKA Railroad Strike of 1877 Refining Crude Oil Riverview United Presbyterian Church Robert Lee Vann Roberto Clemente Bridge Roslyn Place Wood Block Paving Sacred Heart Church Safe Haven Denied at Allegheny Arsenal Saint Bernard Church Saint Nicholas Roman Catholic Church Saint Peter Roman Catholic Church Saint Stanislaus Kostka Roman Catholic Church Salk Polio Vaccine Schenley Park Schenley Park Bridge Schenley Park Bridge Seige at the 26th Street Roundhouse Seldom Seen Arch Seventh Street Bridge Sewickley Public Library Shadyside Iron Furnace Shannopin Town Shields Presbyterian Church Shousetown Boatyard Shousetown Cemetery Memorial Simon Girty Sisters of Mercy Site of Bear Tavern Site of the Western Penitentiary Sixteenth Street Bridge Smithfield Street Bridge Southminster Presbyterian Church Southwestern Pennsylvania World War II Memorial St Colman School St. Boniface Roman Catholic Church St. John the Baptist Roman Catholic Church St. John the Baptist Ukrainian Catholic Church St. Joseph's Roman Catholic Church St. Mary's Ukrainian Orthodox Church St. Matthews African Methodist Episcopal Zion Church St. Nicholas Church St. Nicholas Church and Mala Jaska St. Nicholas Croatian Church St. Nicholas Roman Catholic Croatian Church, North Side St. Peter's Evangelical and Reformed Church Standard Chemical Company State Violence Incites Rioting Station WQED Steamboat "New Orleans" Steel on the Move Steelmaking Capital of the World Stephen C. Foster Stephen Collins Foster Stone Mansion Suburban Catalyst The Benedum Center The Biergarten The City of Pittsburgh was named by General John Forbes in Honor of William Pitt The Desperate and the Decadent The Dickson Log House The Duquesne Club The Empty Pocket Pays The First Holy Mass at Fort Duquesne The First Visit of Abraham Lincoln The Forks of the Ohio The Frick Art Museum The Granite Building The Great Steel Strike of 1919 The Highwood The Hiker The Homestead Grays The Homewood Cemetery The Immaculate Reception The Kenny Fountain The King's Garden The Lagering Caves The Mansion House The McKee Mansion The Menace of the Iron Horse The MonCon Railroad The Pagoda The Pittsburgh Agreement The Pittsburgh Platform The Pittsburgh Point The Pittsburgh, Fort Wayne and Chicago Station The Presbyterian Church The Site of Fort Pitt The Thomas Carlin's Sons Foundry The Three Sisters Bridges The Turtle The Venango Path The Windmill The Workers This Memorial is Dedicated to Three Rivers Heritage Trail Three Rivers Stadium Thunderbolt Timber Court Trinity Church Burying Ground Trinity German Evangelical Lutheran Church Troy Hill Fire Station #39 Troy Hill Incline Twenty Murdered and a City Rises Up Twenty-Four Residents Union Local 471 American Federation of Musicians Union Trust Company-Lawyers Title Building United Steelworkers of America University of Pittsburgh University of Pittsburgh Log Schoolhouse USS Maine Memorial V.F.W. Vance Fort Veterans Memorial Veterans Memorial Veterans Memorial Veterans Memorial Veterans Memorial Veterans of Foreign Wars of the United States Victor Herbert Vietnam Veterans Monument Walker-Ewing Log House Wall Section Through Rampart of Fort Pitt Welcome to Point State Park Welcome to the Frick Woods / Pennsylvania - Forest Land West Hall West View Memorial Western Pennsylvania Hospital Western Pennsylvania Tuskegee Airmen Memorial Westinghouse Atom Smasher Westinghouse Electric Corporation Westinghouse Gas Wells Westinghouse Railroad Air Brake Who Was the Howling Mob? William D. Boyce William Penn Snyder House William T. Kerr William "Billy" Strayhorn Work Accidents and the Law World War I Memorial World War I Memorial World War I Memorial World War I Memorial World War II Memorial World War II Memorial Yohogania Courthouse "Piazza Lavoro" and "Mythic Source," 1984 "Pittsburgh Variations," 1984 "The Bell Speaks" "The Forks," 1984
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Pennsylvania is home to the longest stone arch bridge in the world, the Rockville Bridge, which spans the Susquehanna River near Harrisburg.
Allegheny County, located in western Pennsylvania, has a rich and diverse history that spans centuries. Originally inhabited by Native American tribes such as the Shawnee and Delaware, European settlers arrived in the area during the 18th century. The French and Indian War and the American Revolution played significant roles in shaping the early days of the county, with events like the Battle of Bushy Run and the Whiskey Rebellion taking place within its borders.

The county's development, particularly in the 19th and 20th centuries, was heavily influenced by the rise of industry. With its abundant natural resources, including coal and iron ore, Allegheny County became a major center for steel production, earning the moniker "Steel City." The expansion of railroads and the construction of the Erie Canal further facilitated economic growth in the area.

Throughout its history, Allegheny County has been home to influential figures in politics, business, and culture. Pittsburgh, the county seat and largest city, has produced notable individuals such as Andrew Carnegie, who built a vast steel empire, and Rachel Carson, environmentalist and author of "Silent Spring." The region's thriving arts scene also includes the Carnegie Museums, the Pittsburgh Symphony Orchestra, and the Pittsburgh Opera.

In recent decades, Allegheny County has undergone a transformation from an industrial powerhouse to a more diversified economy focused on healthcare, education, technology, and robotics. Although the decline of the steel industry caused significant challenges, the county has rebounded by embracing new industries and investing in urban revitalization efforts.

Today, Allegheny County remains a vibrant and culturally rich area, with a strong spirit of resilience and innovation. Its history continues to shape its present, as the county keeps evolving and adapting to the changing economic and social landscape.

This timeline provides a condensed summary of the historical journey of Allegheny County, Pennsylvania.

  • 1788 - Allegheny County is established on September 24.
  • 1794 - The "Whiskey Rebellion" protests occur in the county.
  • 1840 - The Pennsylvania Railroad arrives in Allegheny County, stimulating industrial development.
  • 1873 - The Great Railroad Strike takes place in the county.
  • 1889 - The Johnstown Flood affects parts of Allegheny County.
  • 1907 - The Pittsburgh Pirates, now known as the Pittsburgh Steelers, are founded in Allegheny County.
  • 1968 - Pittsburgh becomes the county seat of Allegheny County.
  • 1981 - The collapse of the Kinzua Bridge impacts the county's transportation infrastructure.
  • 1998 - The completion of the Pittsburgh International Airport's new terminal enhances air travel in the county.
  • 2018 - Allegheny County celebrates its 230th anniversary.