Largest Counties in Pennsylvania

One of the original 13 colonies, Pennsylvania is known for its role in early American history, including the signing of the Declaration of Independence in Philadelphia. It has 67 counties.

10 Largest Counties in Pennsylvania

1. Philadelphia County

County Facts

  • Population: Approximately 1,585,000
  • Area Codes: 215, 267, 445
  • Zip Codes: 19101-19153
  • County Seat: Philadelphia

Geography and History

Philadelphia County, located in southeastern Pennsylvania, is home to the city of Philadelphia, the largest city in the state. It is bounded by the Schuylkill and Delaware Rivers, providing it with a significant waterfront. The county is characterized by a densely urbanized area with a mix of residential, commercial, and historical sites. Philadelphia was founded in 1682 by William Penn and served as the nation’s capital from 1790 to 1800 while the federal government was relocating to Washington, D.C. The city played a pivotal role in American history, hosting the First and Second Continental Congresses and the Constitutional Convention in 1787. The county’s historical significance is reflected in its many historic districts and landmarks, as well as its role in the development of the United States.

Colleges and Universities

  • University of Pennsylvania: An Ivy League institution known for its strong programs in business, law, and medicine.
  • Temple University: A major public research university offering a wide range of undergraduate and graduate programs.
  • Drexel University: A private research university with notable programs in engineering, business, and health sciences.
  • La Salle University: A private Catholic university offering liberal arts education with a strong emphasis on community service.

Major Landmarks

Philadelphia County boasts numerous significant landmarks that highlight its historical and cultural importance. The Liberty Bell, housed in the Liberty Bell Center, is an iconic symbol of American independence. Independence Hall, where the Declaration of Independence and the U.S. Constitution were debated and adopted, stands as a UNESCO World Heritage Site. The Philadelphia Museum of Art, with its famous “Rocky Steps,” houses an extensive collection of art and is a major cultural attraction. The National Constitution Center offers interactive exhibits on the U.S. Constitution and American history. The Reading Terminal Market is a historic food market with diverse culinary offerings. Additionally, the Philadelphia Zoo, one of the oldest zoos in the United States, features a wide variety of animal exhibits and conservation efforts. These landmarks illustrate Philadelphia’s rich history and vibrant cultural scene.


2. Allegheny County

County Facts

  • Population: Approximately 1,220,000
  • Area Codes: 412, 724, 878
  • Zip Codes: 15101-15237
  • County Seat: Pittsburgh

Geography and History

Allegheny County is located in southwestern Pennsylvania and includes the city of Pittsburgh. The county is characterized by its rugged terrain, with the Allegheny, Monongahela, and Ohio Rivers converging in Pittsburgh. The area’s geography includes numerous hills and valleys, which have influenced its development. Established in 1788, Allegheny County was a major center for steel production during the Industrial Revolution, contributing significantly to Pittsburgh’s growth. The decline of the steel industry in the late 20th century led to a period of economic transition, with the county diversifying into technology, education, and healthcare sectors. Pittsburgh, the county seat, has transformed from an industrial hub to a center for finance, education, and medical research.

Colleges and Universities

  • University of Pittsburgh: A major public research university known for its strong programs in medicine, engineering, and business.
  • Carnegie Mellon University: A private research university with renowned programs in technology, arts, and business.
  • Duquesne University: A private Catholic university offering a range of programs with a focus on liberal arts and professional education.
  • Point Park University: A private university with strong programs in performing arts and communications.

Major Landmarks

Allegheny County features several prominent landmarks, particularly in Pittsburgh. The Andy Warhol Museum celebrates the life and work of the famous pop artist with extensive exhibits. The Phipps Conservatory and Botanical Gardens offer beautiful themed gardens and educational programs. The Duquesne Incline provides panoramic views of Pittsburgh’s skyline and riverfront. Heinz Field and PNC Park are major sports venues hosting Pittsburgh Steelers football games and Pittsburgh Pirates baseball games, respectively. The Carnegie Museum of Natural History and Carnegie Museum of Art provide extensive collections and cultural exhibits. The Point State Park, located at the confluence of the Allegheny, Monongahela, and Ohio Rivers, features historic monuments and scenic trails. These landmarks reflect Allegheny County’s rich industrial heritage and vibrant cultural scene.


3. Montgomery County

County Facts

  • Population: Approximately 850,000
  • Area Codes: 215, 267, 610, 484
  • Zip Codes: 19001-19090
  • County Seat: Norristown

Geography and History

Montgomery County is located in southeastern Pennsylvania, just northwest of Philadelphia. The county features a mix of suburban and rural landscapes, with a variety of parks and open spaces. Established in 1784, Montgomery County was named in honor of General Richard Montgomery, an American Revolutionary War hero. The county has a rich history of early American settlement and development. It played a role in the Revolutionary War, including the famous Battle of Germantown. Over the years, Montgomery County has evolved from a primarily agricultural area to a thriving suburban community with a strong economic base. The county seat, Norristown, has historically served as a center of commerce and government.

Colleges and Universities

  • Montgomery County Community College: Offers a range of vocational and academic programs, focusing on accessible education and workforce development.
  • Ursinus College: A private liberal arts college known for its strong emphasis on critical thinking and community engagement.
  • Arcadia University: Provides a variety of undergraduate and graduate programs with a focus on global perspectives and practical experience.

Major Landmarks

Montgomery County boasts several notable landmarks that reflect its historical and cultural heritage. The Valley Forge National Historical Park commemorates the site of the 1777-1778 winter encampment of the Continental Army. The Montgomery County Court House, a historic building in Norristown, serves as a symbol of the county’s governmental history. The Elmwood Park Zoo offers educational programs and exhibits related to wildlife conservation. The Schuylkill River Trail provides scenic recreational opportunities along the river. Additionally, the Peter Wentz Farmstead is a historic farm museum showcasing early American rural life. These landmarks highlight Montgomery County’s rich history and natural beauty.


4. Bucks County

County Facts

  • Population: Approximately 650,000
  • Area Codes: 215, 267, 610, 484
  • Zip Codes: 18901-18976
  • County Seat: Doylestown

Geography and History

Bucks County is located in southeastern Pennsylvania, along the Delaware River. The county features a mix of suburban and rural landscapes, with rolling hills, farmland, and historic towns. Established in 1682, Bucks County is one of the original counties of Pennsylvania and was named after Buckinghamshire, England. The county has a rich colonial history and played a role in the American Revolution, including serving as a supply base and refuge for the Continental Army. The county seat, Doylestown, is known for its well-preserved 19th-century architecture and historical sites. Bucks County has evolved from its agricultural roots into a vibrant suburban community with a strong sense of historical preservation.

Colleges and Universities

  • Bucks County Community College: Provides vocational and academic programs with a focus on accessible education and workforce development.
  • Delaware Valley University: Offers programs in agriculture, business, and science, with a strong emphasis on hands-on learning and practical experience.
  • Temple University (Ambler Campus): Provides undergraduate and graduate programs with a focus on community engagement and practical skills.

Major Landmarks

Bucks County is known for several significant landmarks that reflect its historical and cultural heritage. The Washington Crossing Historic Park commemorates George Washington’s crossing of the Delaware River and offers historical exhibits and reenactments. The Fonthill Castle, the former home of Henry Mercer, features a unique collection of tilework and architecture. The Moravian Tile Works, also founded by Mercer, showcases historic tile production techniques. The New Hope Historic District includes well-preserved 19th-century buildings and a vibrant arts scene. Additionally, the Michener Art Museum features a collection of American art and local history exhibits. These landmarks highlight Bucks County’s rich history and cultural heritage.


5. Chester County

County Facts

  • Population: Approximately 550,000
  • Area Codes: 610, 484
  • Zip Codes: 19301-19382
  • County Seat: West Chester

Geography and History

Chester County is located in southeastern Pennsylvania, west of Philadelphia. The county features a mix of rolling hills, farmland, and historic towns, with a rural character interspersed with suburban development. Established in 1682, Chester County was one of the original counties of Pennsylvania and was named after Chester, England. The county has a rich colonial history and played a role in the American Revolution, including being the site of several skirmishes and encampments. The county seat, West Chester, is known for its historic downtown area, which includes a number of 19th-century buildings and cultural institutions. Chester County has evolved from its agricultural origins into a vibrant community with a focus on historical preservation and local heritage.

Colleges and Universities

  • West Chester University: A public university offering a range of undergraduate and graduate programs with a focus on liberal arts and professional education.
  • Immaculata University: A private Catholic university known for its strong programs in education, health sciences, and liberal arts.
  • Pennsylvania State University (Great Valley Campus): Offers graduate programs and professional development opportunities in various fields.

Major Landmarks

Chester County features several significant landmarks that reflect its historical and cultural heritage. The Longwood Gardens, a premier botanical garden, offers expansive and beautifully designed gardens. The Brandywine River Museum of Art, located in Chadds Ford, is renowned for its collection of American art, including works by the Wyeth family. The Historic Yellow Springs area provides insights into early American life and includes a variety of preserved buildings and cultural exhibits. The Chester County Historical Society Museum offers exhibits on local history and heritage. Additionally, the QVC Studio Park offers behind-the-scenes tours and insights into the operations of the popular shopping network. These landmarks highlight Chester County’s rich history and cultural significance.


6. Lancaster County

County Facts

  • Population: Approximately 550,000
  • Area Codes: 717
  • Zip Codes: 17501-17699
  • County Seat: Lancaster

Geography and History

Lancaster County is located in southeastern Pennsylvania and is known for its picturesque rural landscapes, including rolling hills and farmland. The county is a major center of Pennsylvania Dutch culture, with a significant Amish population. Established in 1729, Lancaster County is one of the oldest counties in Pennsylvania and was named after Lancaster, England. The county played a role in early American history, serving as the temporary capital of the United States in 1799. Lancaster, the county seat, is known for its historic charm and vibrant downtown area. The county’s history is deeply intertwined with its agricultural heritage and the cultural traditions of the Amish community.

Colleges and Universities

  • Lancaster Bible College: A private Christian college offering a range of programs with a focus on Biblical studies and ministry.
  • Elizabethtown College: A private liberal arts college known for its strong programs in business, education, and health sciences.
  • Millersville University: A public university offering a variety of undergraduate and graduate programs with a focus on education and applied sciences.

Major Landmarks

Lancaster County is renowned for several key landmarks that showcase its historical and cultural significance. The Amish Farm and House offers tours and educational experiences about Amish culture and lifestyle. The Lancaster Central Market, one of the oldest continuously operating farmers’ markets in the U.S., provides a variety of local produce and goods. The President James Buchanan’s Wheatland is the historic home of the 15th President of the United States, offering tours and historical exhibits. The Landis Valley Village and Farm Museum provides insights into 18th and 19th-century Pennsylvania German life. Additionally, the Fulton Theatre in Lancaster offers a range of live performances and cultural events. These landmarks highlight Lancaster County’s rich history and cultural heritage.


7. York County

County Facts

  • Population: Approximately 460,000
  • Area Codes: 717
  • Zip Codes: 17401-17409, 17415-17421
  • County Seat: York

Geography and History

York County is located in south-central Pennsylvania and features a mix of rolling hills, farmland, and suburban development. The county has a rich history tied to its agricultural heritage and its role in early American industry. Established in 1749, York County was named after York, England. The county played a significant role during the American Revolution, with the Continental Congress meeting in York in 1777-1778 when Philadelphia was occupied by British forces. York, the county seat, is known for its historic downtown and its role in the development of the region’s industrial base.

Colleges and Universities

  • York College of Pennsylvania: A private liberal arts college offering undergraduate and graduate programs with a focus on professional education.
  • Penn State York: A branch of Penn State University offering a range of undergraduate programs and professional development opportunities.
  • Hacc, Central Pennsylvania’s Community College (York Campus): Provides vocational and academic programs with a focus on accessible education and workforce development.

Major Landmarks

York County features several significant landmarks that reflect its historical and cultural heritage. The York County Heritage Trust operates several museums, including the Historical Society Museum and the Colonial Complex, which provide insights into the county’s history. The Central Market, located in York, is a historic farmers’ market offering a variety of local goods and produce. The Harley-Davidson Vehicle Operations plant offers factory tours and insights into the history of this iconic American brand. The Gettysburg National Military Park, located nearby, commemorates the pivotal Battle of Gettysburg and provides extensive historical exhibits. Additionally, the Appell Center for the Performing Arts in York offers a range of cultural performances and events. These landmarks highlight York County’s rich historical and cultural significance.


8. Cumberland County

County Facts

  • Population: Approximately 270,000
  • Area Codes: 717
  • Zip Codes: 17001-17050, 17055, 17070, 17083
  • County Seat: Carlisle

Geography and History

Cumberland County is located in south-central Pennsylvania, with a diverse landscape including rolling hills, farmland, and suburban development. The county was established in 1750 and named after Cumberland, England. It has a rich history tied to its strategic location along major transportation routes, including the Carlisle Barracks, which has been a significant military site since the 18th century. Carlisle, the county seat, is known for its historic charm and as the location of the Dickinson College, a prominent liberal arts institution. The county has played a role in both the American Revolution and the Civil War, with several historic sites and monuments reflecting its historical significance.

Colleges and Universities

  • Dickinson College: A private liberal arts college known for its strong programs in the humanities, social sciences, and international studies.
  • Central Pennsylvania College: Offers a range of undergraduate and graduate programs with a focus on career-oriented education.
  • Hacc, Central Pennsylvania’s Community College (Carlisle Campus): Provides vocational and academic programs aimed at local workforce development.

Major Landmarks

Cumberland County is known for several significant landmarks that showcase its historical and cultural significance. The Carlisle Barracks is one of the oldest military installations in the U.S., with a rich history and museum exhibits. The Dickinson College campus features historic buildings and cultural events. The Cumberland County Historical Society Museum provides insights into the county’s past with a range of exhibits and artifacts. The Historic Carlisle area includes well-preserved 18th and 19th-century architecture. Additionally, the Kings Gap Environmental Education Center offers scenic trails and environmental education programs. These landmarks highlight Cumberland County’s historical importance and natural beauty.


9. Lehigh County

County Facts

  • Population: Approximately 370,000
  • Area Codes: 610, 484
  • Zip Codes: 18001-18062, 18067, 18072, 18101-18106
  • County Seat: Allentown

Geography and History

Lehigh County is located in eastern Pennsylvania, with a varied landscape that includes urban areas, rolling hills, and agricultural land. The county was established in 1812 and was named after the Lehigh River, which runs through the region. The county’s history is closely tied to the development of the industrial revolution, particularly in the iron and steel industries. Allentown, the county seat, is the largest city in the county and has historically been a center of manufacturing and industry. The city has transformed over the years, focusing more on cultural and economic development.

Colleges and Universities

  • Lehigh University: A private research university known for its programs in engineering, business, and the sciences.
  • Cedar Crest College: A private liberal arts college for women, offering programs in various fields including health sciences and business.
  • DeSales University: A private Catholic university offering a range of undergraduate and graduate programs with a focus on liberal arts and professional education.

Major Landmarks

Lehigh County features several notable landmarks that reflect its historical and cultural heritage. The Allentown Art Museum houses an extensive collection of American art and hosts a variety of exhibitions. The Liberty Bell Museum, located in the Zion’s Reformed United Church of Christ, includes a replica of the Liberty Bell and exhibits related to its history. The America on Wheels Museum showcases the history of transportation in the United States with a range of exhibits on cars, trucks, and bicycles. The Dorney Park & Wildwater Kingdom provides entertainment and recreational activities for visitors of all ages. Additionally, the Trexler Nature Preserve offers scenic trails and opportunities for outdoor recreation. These landmarks highlight Lehigh County’s industrial heritage and cultural attractions.


10. Monroe County

County Facts

  • Population: Approximately 180,000
  • Area Codes: 570, 610
  • Zip Codes: 18301-18372
  • County Seat: Stroudsburg

Geography and History

Monroe County is located in northeastern Pennsylvania, part of the Pocono Mountains region. The county features a landscape of rolling hills, forests, and numerous lakes and rivers, making it a popular destination for outdoor activities. Established in 1836, Monroe County was named after President James Monroe. The area’s history includes early settlement and development tied to agriculture and tourism. The county seat, Stroudsburg, has a historic downtown area with preserved 19th-century architecture and a strong sense of local heritage. Monroe County has become known for its tourism industry, particularly related to its natural beauty and recreational opportunities.

Colleges and Universities

  • East Stroudsburg University: A public university offering a range of undergraduate and graduate programs with a focus on education and business.
  • DeSales University (East Stroudsburg Campus): Provides programs in liberal arts and professional fields with a focus on practical experience.
  • Monroe Career & Technical Institute: Offers vocational and technical training programs aimed at supporting local workforce development.

Major Landmarks

Monroe County is known for several significant landmarks that highlight its natural beauty and recreational opportunities. The Pocono Raceway is a major venue for NASCAR races and other motorsport events. The Delaware Water Gap National Recreation Area offers scenic views, hiking trails, and opportunities for outdoor recreation along the Delaware River. The Shawnee Mountain Ski Area provides winter sports and activities for visitors. The Quiet Valley Living Historical Farm offers a glimpse into 19th-century farm life with interactive exhibits and historical demonstrations. Additionally, the Camelback Mountain Resort features a variety of recreational activities, including skiing, snowboarding, and a water park. These landmarks showcase Monroe County’s diverse attractions and natural beauty.