# Top 30 critical infrastructure operators in Philadelphia

Tamtam tracks 41 critical infrastructure operators headquartered in Philadelphia. This list ranks the 30 largest by number of employees on LinkedIn, led by Comcast, Penn Medicine, University of Pennsylvania Health System and Jefferson Health. Their median headcount is 863. Half of them were founded in 1938 or later.

This list features large operators of critical infrastructure in Philadelphia, primarily in healthcare and telecommunications. Key players include Comcast, a major provider of broadband and entertainment, and Penn Medicine, a leading academic medical center. Other significant entities are Jefferson Health, focused on clinical care and research, and Children's Hospital of Philadelphia, a specialized pediatric hospital. These are well-established organizations, with many founded in the late 19th or mid-20th century.

The data shows a strong concentration of healthcare providers, with several large hospital systems such as Temple Health and Einstein Healthcare Network. Beyond healthcare, other critical services are represented by organizations like Southeastern Pennsylvania Transportation Authority (SEPTA) for public transit, PECO for utilities, and Philadelphia Gas Works for natural gas.

🇺🇸 Philadelphia · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Comcast](https://www.tamtam.ai/c/comcast) (comcast.com)<br>Delivering broadband, mobile, and video products, along with entertainment, sports, news, and theme park experiences; driven by passionate creators and innovators | Telecommunications | 🇺🇸 Philadelphia | 189,000 | 1963 |
| 2 | [Penn Medicine, University of Pennsylvania Health System](https://www.tamtam.ai/c/penn-medicine-university-of-pennsylvania-health-system) (pennmedicine.org)<br>Leading academic medical center combining cutting-edge research, comprehensive patient care, and education to improve health and transform lives regionally. | Hospitals and Health Care | 🇺🇸 Philadelphia | 21,979 |  |
| 3 | [Jefferson Health](https://www.tamtam.ai/c/jefferson-health) (jeffersonhealth.org)<br>This company is dedicated to providing excellent clinical care, educating future health professionals, and advancing research in health sciences | Hospitals and Health Care | 🇺🇸 Philadelphia | 18,520 |  |
| 4 | [Children's Hospital of Philadelphia](https://www.tamtam.ai/c/children-s-hospital-of-philadelphia) (chop.edu)<br>Specialized pediatric hospital providing exceptional patient care, pioneering medical research, and training future pediatric healthcare professionals. | Hospitals and Health Care | 🇺🇸 Philadelphia | 18,042 | 1855 |
| 5 | [Comcast Business](https://www.tamtam.ai/c/comcast-business) (business.comcast.com)<br>A technology solutions provider offering connectivity, networking, cybersecurity, and communications solutions to businesses of all sizes, with a focus on driving innovation and growth | Telecommunications | 🇺🇸 Philadelphia | 9,292 |  |
| 6 | [Temple Health – Temple University Health System](https://www.tamtam.ai/c/temple-health-temple-university-health-system) (templehealth.org)<br>Temple Health provides advanced research and clinical care, offering innovative treatments through renowned physicians, nurses, and researchers in various medical facilities and practices | Hospitals and Health Care | 🇺🇸 Philadelphia | 5,770 | 1892 |
| 7 | [Southeastern Pennsylvania Transportation Authority (SEPTA)](https://www.tamtam.ai/c/southeastern-pennsylvania-transportation-authority-septa) (septa.org)<br>A major public transit system in Southeastern Pennsylvania offering bus, subway, trolley, Regional Rail, paratransit, and shared ride services across multiple counties | Ground Passenger Transportation | 🇺🇸 Philadelphia | 3,982 | 1964 |
| 8 | [Xfinity](https://www.tamtam.ai/c/xfinity) (xfinity.com)<br>Revolutionizing connectivity with the Xfinity 10G Network, leading the way into the future of high-speed internet services | Telecommunications | 🇺🇸 Philadelphia | 3,979 |  |
| 9 | [Einstein Healthcare Network](https://www.tamtam.ai/c/einstein-healthcare-network) (jeffersonhealth.org)<br>Healthcare network serving Philadelphia and Montgomery County, offering comprehensive medical services and patient care across multiple facilities. | Hospitals and Health Care | 🇺🇸 Philadelphia | 3,812 |  |
| 10 | [PECO](https://www.tamtam.ai/c/peco) (peco.com)<br>A historic company in the energy sector, dedicated to providing safe, reliable, affordable, and clean energy services while promoting environmental awareness and innovation | Utilities | 🇺🇸 Philadelphia | 2,481 | 1881 |
| 11 | [Fox Chase Cancer Center](https://www.tamtam.ai/c/fox-chase-cancer-center) (foxchase.org)<br>Dedicated cancer hospital with expert multidisciplinary teams advancing prevention, diagnosis, treatment, and survivorship through pioneering research and clinical care. | Hospitals and Health Care | 🇺🇸 Philadelphia | 2,146 | 1904 |
| 12 | [Aria - Jefferson Health](https://www.tamtam.ai/c/aria-jefferson-health) (jeffersonhealth.org)<br>A leading healthcare provider in Northeast Philadelphia and Lower Bucks County, offering community hospitals, outpatient centers, and primary care physicians to improve lives | Hospitals and Health Care | 🇺🇸 Philadelphia | 1,421 |  |
| 13 | [St. Christopher's Hospital for Children](https://www.tamtam.ai/c/st-christopher-s-hospital-for-children) (towerhealth.org)<br>A renowned pediatric care provider in Philadelphia offering exceptional services and nationally recognized programs for children worldwide since 1875 | Hospitals and Health Care | 🇺🇸 Philadelphia | 1,364 | 1875 |
| 14 | [Philadelphia Gas Works](https://www.tamtam.ai/c/philadelphia-gas-works) (pgworks.com)<br>provides natural gas energy services and solutions to over 500,000 residential and commercial customers in Philadelphia city | Utilities | 🇺🇸 Philadelphia | 1,047 | 1836 |
| 15 | [Philadelphia Water Department](https://www.tamtam.ai/c/philadelphia-water-department) (water.phila.gov)<br>This company provides integrated water, wastewater, and stormwater services to the City of Philadelphia's 15 million residents, focusing on high-quality water supply and watershed management | Government Administration | 🇺🇸 Philadelphia | 863 | 1951 |
| 16 | [Federal Reserve Bank of Philadelphia](https://www.tamtam.ai/c/federal-reserve-bank-of-philadelphia) (philadelphiafed.org)<br>Implement monetary policy, supervise banks, provide financial services to institutions and government One of 12 regional Reserve Banks in Federal Reserve System | Financial Services | 🇺🇸 Philadelphia | 852 | 1914 |
| 17 | [Nazareth Hospital](https://www.tamtam.ai/c/nazareth-hospital) (trinityhealthma.org)<br>Providing compassionate healthcare services to Northeast Philadelphia and surrounding areas for over 75 years with a focus on personal care | Hospitals and Health Care | 🇺🇸 Philadelphia | 825 | 1940 |
| 18 | [Philadelphia Fire Department](https://www.tamtam.ai/c/philadelphia-fire-department) (phila.gov)<br>The company provides fire protection, emergency medical services, and specialized divisions to investigate fires and protect Philadelphia International Airport | Public Safety | 🇺🇸 Philadelphia | 722 | 1871 |
| 19 | [Police and Fire Federal Credit Union](https://www.tamtam.ai/c/police-and-fire-federal-credit-union) (pffcu.org)<br>A financial organization focused on exceptional member service, offering loans, deposits, competitive salaries, benefits, and growth opportunities for motivated professionals | Banking | 🇺🇸 Philadelphia | 669 | 1938 |
| 20 | [Jefferson Moss-Magee Rehabilitation](https://www.tamtam.ai/c/jefferson-moss-magee-rehabilitation) (jeffersonhealth.org)<br>Provider of physical and cognitive rehabilitation in Philadelphia region, offering lifetime programs for individuals with spinal cord injury, brain injury, stroke, and more | Hospitals and Health Care | 🇺🇸 Philadelphia | 603 | 1958 |
| 21 | [Xfinity Communities](https://www.tamtam.ai/c/xfinity-communities) (xfinity.com)<br>Provides fast, reliable internet and entertainment services to multiple communities, ensuring connectivity and 24/7 customer support. | Telecommunications | 🇺🇸 Philadelphia | 565 |  |
| 22 | [Wills Eye Hospital](https://www.tamtam.ai/c/wills-eye-hospital) (willseye.org)<br>A global leader in eye disease treatment, providing top-notch care, cutting-edge technology, and advanced surgical capabilities to patients worldwide since 1832 | Hospitals and Health Care | 🇺🇸 Philadelphia | 556 | 1832 |
| 23 | [Conrail](https://www.tamtam.ai/c/conrail) (conrail.com)<br>Conrail provides services for CSX Corporation and Norfolk Southern Corporation, offering transportation solutions to meet their logistics needs | Truck Transportation | 🇺🇸 Philadelphia | 527 | 1976 |
| 24 | [American Heritage Credit Union](https://www.tamtam.ai/c/american-heritage-credit-union) (americanheritagecu.org)<br>A member-owned financial cooperative offering tailored financial solutions, serving over 300,000 members through 35+ locations in the Greater Philadelphia area | Financial Services | 🇺🇸 Philadelphia | 518 | 1948 |
| 25 | [The Renfrew Center](https://www.tamtam.ai/c/the-renfrew-center) (renfrewcenter.com)<br>Leader in eating disorder treatment since 1985, offering residential, day, outpatient, and virtual services with evidence-based therapy to support recovery and healing | Mental Health Care | 🇺🇸 Philadelphia | 452 | 1985 |
| 26 | [GSPP Rehabilitation](https://www.tamtam.ai/c/gspp-rehabilitation) (pennrehab.org)<br>Innovative rehabilitation services for a wide range of conditions, offering inpatient and outpatient care, guided by expert clinical staff shaping future research | Hospitals and Health Care | 🇺🇸 Philadelphia | 445 | 2008 |
| 27 | [Chestnut Hill Hospital - Temple Health](https://www.tamtam.ai/c/chestnut-hill-hospital-temple-health) (templehealth.org)<br>A community-based teaching hospital in Chestnut Hill, Philadelphia, offering a wide range of diagnostic, treatment services, and specialties with board-certified physicians | Hospitals and Health Care | 🇺🇸 Philadelphia | 432 |  |
| 28 | [Beneficial Bank](https://www.tamtam.ai/c/beneficial-bank) (wsfsbank.com)<br>This company has transitioned to WSFS Bank They provide financial services and have a LinkedIn page at https://wwwlinkedincom/company/wsfs-bank | Banking | 🇺🇸 Philadelphia | 420 | 1832 |
| 29 | [Thomas Jefferson University Hospital](https://www.tamtam.ai/c/thomas-jefferson-university-hospital) (jeffersonhealth.org)<br>The company provides excellent clinical and compassionate care for patients in the Philadelphia region through a partnership with a university | Medical Practices | 🇺🇸 Philadelphia | 403 |  |
| 30 | [Philadelphia Parking Authority](https://www.tamtam.ai/c/philadelphia-parking-authority) (philapark.org)<br>The company manages parking and transportation services in Philadelphia, including street parking, airport parking, garages, red-light camera enforcement, and taxi regulation | Government Administration | 🇺🇸 Philadelphia | 367 |  |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

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## The same list elsewhere in United States

- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Critical infrastructure operators in Texas](https://www.tamtam.ai/l/critical-infrastructure-operators-texas) (579)
- [Critical infrastructure operators in California](https://www.tamtam.ai/l/critical-infrastructure-operators-california) (483)
- [Critical infrastructure operators in New York State](https://www.tamtam.ai/l/critical-infrastructure-operators-new-york-state) (379)
- [Critical infrastructure operators in Florida](https://www.tamtam.ai/l/critical-infrastructure-operators-florida) (321)
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- [Critical infrastructure operators in Pennsylvania](https://www.tamtam.ai/l/critical-infrastructure-operators-pennsylvania) (225)
- [Critical infrastructure operators in Alabama](https://www.tamtam.ai/l/critical-infrastructure-operators-alabama) (186)
- [Critical infrastructure operators in North Carolina](https://www.tamtam.ai/l/critical-infrastructure-operators-north-carolina) (171)
- [Critical infrastructure operators in Massachusetts](https://www.tamtam.ai/l/critical-infrastructure-operators-massachusetts) (165)
- [Critical infrastructure operators in Ohio](https://www.tamtam.ai/l/critical-infrastructure-operators-ohio) (153)
- [Critical infrastructure operators in Michigan](https://www.tamtam.ai/l/critical-infrastructure-operators-michigan) (150)
- [Critical infrastructure operators in Washington State](https://www.tamtam.ai/l/critical-infrastructure-operators-washington-state) (149)
- [Critical infrastructure operators in Colorado](https://www.tamtam.ai/l/critical-infrastructure-operators-colorado) (137)
- [Critical infrastructure operators in Tennessee](https://www.tamtam.ai/l/critical-infrastructure-operators-tennessee) (132)
- [Critical infrastructure operators in Virginia](https://www.tamtam.ai/l/critical-infrastructure-operators-virginia) (131)
- [Critical infrastructure operators in New Jersey](https://www.tamtam.ai/l/critical-infrastructure-operators-new-jersey) (130)
- [Critical infrastructure operators in Indiana](https://www.tamtam.ai/l/critical-infrastructure-operators-indiana) (129)
- [Critical infrastructure operators in Georgia](https://www.tamtam.ai/l/critical-infrastructure-operators-georgia) (126)
- [Critical infrastructure operators in Missouri](https://www.tamtam.ai/l/critical-infrastructure-operators-missouri) (120)
- [Critical infrastructure operators in Minnesota](https://www.tamtam.ai/l/critical-infrastructure-operators-minnesota) (115)
- [Critical infrastructure operators in Wisconsin](https://www.tamtam.ai/l/critical-infrastructure-operators-wisconsin) (115)
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- [Critical infrastructure operators in New York](https://www.tamtam.ai/l/critical-infrastructure-operators-new-york) (139)

## The same list elsewhere

- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [Critical infrastructure operators in North America](https://www.tamtam.ai/l/critical-infrastructure-operators-in-north-america) (6,768)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-philadelphia