Tamtam Start free

List of critical infrastructure operators in Dallas

Tamtam tracks 61 critical infrastructure operators headquartered in Dallas. This list ranks all of them by number of employees on LinkedIn, led by AT&T, Tenet Healthcare and Southwest Airlines. Their median headcount is 1,265. Half of them were founded in 1975 or later.

馃嚭馃嚫 Dallas61 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
AT&Tatt.com

Innovative company connecting people with technology to create a seamless, better life through network, products, services, and passionate employees

Telecommunications 馃嚭馃嚫 Dallas 193,793 n/a
2
Tenet Healthcaretenethealth.com

Operates ambulatory surgery centers, acute and specialty hospitals, physician networks, and provides revenue cycle management and value-based care services.

Hospitals and Health Care 馃嚭馃嚫 Dallas 44,016 n/a
3
Southwest Airlinessouthwest.com

This company provides a friendly, customer-centered airline experience, prioritizing customer service and compassion in all their interactions

Airlines and Aviation 馃嚭馃嚫 Dallas 40,329 1971
4
Baylor Scott & White Healthbswhealth.com

A Texas-based not-for-profit health system dedicated to providing accessible, integrated, and affordable healthcare through a wide network of facilities and services

Hospitals and Health Care 馃嚭馃嚫 Dallas 31,869 1903
5
UT Southwestern Medical Centerutsouthwestern.edu

An academic medical center with top research, education, and patient care; offering training to students and providing specialized healthcare services

Hospitals and Health Care 馃嚭馃嚫 Dallas 19,275 1943
6
Frontier Internetfrontier.com

Largest pure-play fiber provider in the U.S., delivering blazing-fast broadband connectivity to millions of consumers and businesses nationwide.

Telecommunications 馃嚭馃嚫 Dallas 12,461 1935
7
Comerica Bankcomerica.com

Financial services company offering business banking, retail banking, and wealth management across major U.S. cities and select international markets.

Banking 馃嚭馃嚫 Dallas 10,425 1849
8
Methodist Health Systemmethodisthealthsystem.org

A faith-based healthcare organization focused on improving lives through compassionate, quality care with nationally recognized medical services and a strong community commitment

Hospitals and Health Care 馃嚭馃嚫 Dallas 8,838 1927
9
Parkland Healthparklandhealth.org

Large public hospital system providing trauma care, burn center, neonatal ICU, community clinics, education programs, and medical teaching services.

Hospitals and Health Care 馃嚭馃嚫 Dallas 8,765 1894
10
Children's Healthjobsearch.childrens.com

A leading pediatric health care provider in North Texas, offering comprehensive services, innovative treatments, and groundbreaking research for children's health and wellness

Hospitals and Health Care 馃嚭馃嚫 Dallas 8,516 1913
11
Medical City Healthcarewwwprod104-hcadallas-sitecore-cloud.dpxmedcity.net

Leading healthcare provider with 20 hospitals, 15 surgery centers, urgent care facilities, and a large network of physicians and nurses, prioritizing patient care and advanced technology

Hospitals and Health Care 馃嚭馃嚫 Dallas 7,276 n/a
12
City of Dallasdallascityhall.com

Local government providing public services, managing city operations, supporting community needs, and promoting values of empathy, ethics, excellence, and equity.

Government Administration 馃嚭馃嚫 Dallas 6,844 1841
13
Sunoco LPsunocolp.com

Extensive pipeline network and terminals supporting fuel distribution to thousands of branded locations, independent dealers, and commercial customers.

Oil and Gas 馃嚭馃嚫 Dallas 6,493 1886
14
HF Sinclairhfsinclair.com

Manufactures and sells light products, fuels, lubricants, and asphalt; operates refineries; markets motor fuel; produces renewable diesel and specialized lubricants.

Oil and Gas 馃嚭馃嚫 Dallas 6,426 n/a
15
Metro by T-Mobilemetrobyt-mobile.com

The company provides simple and affordable connected solutions for prepaid consumers, prioritizing customer needs with flexible, affordable, and transparent wireless services

Telecommunications 馃嚭馃嚫 Dallas 6,055 1994
16
MV Transportationmvtransit.com

Leading transit services provider partnering with agencies, schools, corporations, focusing on community, safety, employee training, and innovative customer solutions.

Ground Passenger Transportation 馃嚭馃嚫 Dallas 5,198 1975
17
Atmos Energyatmosenergy.com

Safe, reliable, and affordable natural gas delivery to over 3 million customers across eight southern states with modern infrastructure.

Utilities 馃嚭馃嚫 Dallas 4,769 1906
18
Mr. Coopermrcooper.com

We are a innovative leader in the home loan servicing industry, dedicated to reimagining the home loan experience for customers and employees alike

Financial Services 馃嚭馃嚫 Dallas 4,630 1994
19
Oncor Electric Deliveryoncor.com

Regulated electricity distribution and transmission company operating the largest system in Texas, delivering power to nearly 4 million customers.

Utilities 馃嚭馃嚫 Dallas 4,068 n/a
20
Texas Oncologytexasoncology.com

Pioneering provider of high-quality, community-based cancer care with over 530 physicians and 280 locations in Texas and Oklahoma Leading in innovative treatments and clinical trials

Hospitals and Health Care 馃嚭馃嚫 Dallas 4,017 1986
21
Enhabit Home Health & Hospiceenhabit.com

National leader in home health and hospice, providing extraordinary care with compassionate teams, committed to diversity, inclusivity, and exceptional patient healthcare experiences

Hospitals and Health Care 馃嚭馃嚫 Dallas 3,867 1998
22
Greyhound Lines, Inc.careers.greyhound.com

Scheduled passenger bus services across US and Canada, express package delivery, charter services, and talent development in transportation industry.

Truck Transportation 馃嚭馃嚫 Dallas 2,928 1914
23
DART (Dallas Area Rapid Transit)dart.org

Extensive public transit network offering light rail, commuter rail, bus routes, and paratransit services across North Texas area.

Urban Transit Services 馃嚭馃嚫 Dallas 2,847 n/a
24
Steward Health Caresteward.org

A physician-led, minority-owned integrated health care system focused on delivering proactive care at a sustainable cost, promoting community prosperity and stability

Staffing and Recruiting 馃嚭馃嚫 Dallas 2,687 2010
25
United Surgical Partners International, Incuspi.com

largest ambulatory surgery platform operating surgery centers and hospitals, partnering with physicians to deliver high-quality, cost-effective care.

Hospitals and Health Care 馃嚭馃嚫 Dallas 2,566 1998
26
Texas Capitaltexascapitalbank.com

Providing personalized financial services to businesses, individuals, and families with a client-centric approach and experienced banking professionals.

Banking 馃嚭馃嚫 Dallas 2,214 1998
27
Stevens Transportstevenstransport.com

A leading refrigerated transportation company providing regional, dedicated, intermodal, and 3PL services with a focus on integrity and consistent growth

Truck Transportation 馃嚭馃嚫 Dallas 2,072 1980
28
Luminantluminant.com

A competitive power generation business with nearly 17,000 MW in Texas, including nuclear and coal-fueled generation, as well as a large purchaser of wind-generated electricity

Utilities 馃嚭馃嚫 Dallas 2,026 n/a
29
Federal Reserve Bank of Dallasdallasfed.org

Central bank in the United States working on monetary policy, economic research, banking supervision, community outreach, and education in the Eleventh Federal Reserve District

Banking 馃嚭馃嚫 Dallas 1,347 n/a
30
Encompass Home Health & Hospiceehab.com

Provider of home health and hospice services that have merged to form Encompass Health, leveraging combined strengths for improved healthcare delivery

Hospitals and Health Care 馃嚭馃嚫 Dallas 1,332 1998
31
HollyFrontierhfsinclair.com

Independent petroleum refiner producing gasoline, diesel, jet fuel, asphalt, lubricants, operating refineries and logistics in U.S. regions.

Oil and Gas 馃嚭馃嚫 Dallas 1,265 n/a
32
Triumphtriumph.io

A Dallas-based financial holding company offering payments, factoring, and banking services including carrier payment platform, invoice factoring, lending, and insurance solutions

Financial Services 馃嚭馃嚫 Dallas 1,256 2010
33
Senior Care Centersabrihealthcare.com

Provider of senior care services, including skilled nursing, rehabilitation, long-term care, and assisted living in multiple locations across Texas Committed to compassionate and quality care

Hospitals and Health Care 馃嚭馃嚫 Dallas 1,146 2009
34
Apex Fintech Solutionsapexfintechsolutions.com

A leading fintech provider offering solutions for investing, investor education, and innovation to empower market leaders, challengers, and visionaries

Financial Services 馃嚭馃嚫 Dallas 1,108 2012
35
Bank of Texasbankoftexas.com

Bank of Texas offers a wide range of banking services including commercial and consumer banking, investment and trust services, and mortgage origination

Financial Services 馃嚭馃嚫 Dallas 1,073 n/a
36
PlainsCapital Bankplainscapital.com

A Texas bank with over 60 branches and 1,100 employees offering personalized relationship banking, commercial lending, wealth management, and other financial services

Banking 馃嚭馃嚫 Dallas 1,046 1988
37
UT Southwestern Careersutsouthwestern.edu

A leading academic medical center with top faculty conducting groundbreaking research, providing exceptional patient care, and offering advanced medical education

Research Services 馃嚭馃嚫 Dallas 1,000 1943
38
University of Texas Southwestern Medical Centerutsouthwestern.edu

Academic institution specializing in medical education, research, and healthcare training based in Dallas, Texas, United States.

Higher Education 馃嚭馃嚫 Dallas 998 n/a
39
Sunflower Bank, N.A.sunflowerbank.com

A financial institution providing relationship-focused services to meet personal, business, and wealth management needs, with a long history of community support and customer relationships

Banking 馃嚭馃嚫 Dallas 969 1892
40
Metrocare Servicesmetrocareservices.org

A nonprofit in North Texas provides mental health and disability services for over 50,000 people annually, including medication management, therapy, and social services

Hospitals and Health Care 馃嚭馃嚫 Dallas 965 1967
41
Baylor Scott & White Institute for Rehabilitationbswrehab.com

A leading rehabilitation network in Texas, providing comprehensive care through hospitals, outpatient clinics, and a patient-centric approach to help patients regain independence

Hospitals and Health Care 馃嚭馃嚫 Dallas 956 n/a
42
AT&T Cybersecurityatt.com

Specializing in cybersecurity, this company offers edge-to-edge technologies, threat intelligence, collaborative defense, and tailored solutions to protect businesses worldwide

Computer and Network Security 馃嚭馃嚫 Dallas 881 n/a
43
Hunt Oil Companyhuntoil.com

Company prioritizes employee well-being, offering competitive compensation, flexible work schedules, diversity, community engagement, and professional development opportunities.

Oil and Gas 馃嚭馃嚫 Dallas 826 1934
44
EnLink Midstreamenlink.com

EnLink operates midstream assets, providing natural gas, crude oil, NGL capabilities, and energy services, focusing on sustainability and environmental performance in the energy sector

Oil and Gas 馃嚭馃嚫 Dallas 741 2014
45
Cornerstone Healthcare Groupjobs.scionhealth.com

This company based in Dallas offers long-term acute care, senior living, and behavioral health services nationwide since 1990

Hospitals and Health Care 馃嚭馃嚫 Dallas 630 1991
46
T Bank N.A.t.bank

Provides specialized business financing through SBA, USDA, and commercial loans, offering flexible terms and personalized packages to help entrepreneurs secure essential capital.

Banking 馃嚭馃嚫 Dallas 602 2004
47
HealthTexas Provider Network (HTPN)bswhealth.com

A multi-specialty medical group within Baylor Scott & White Health System, providing quality care, outstanding patient experience, and innovative health solutions

Medical Practices 馃嚭馃嚫 Dallas 553 1994
48
Leeward Renewable Energylreus.com

A leading renewable energy company with a portfolio of 24 facilities totaling 2,500 MW, developing wind, solar, and energy storage projects across the US

Electric Power Generation 馃嚭馃嚫 Dallas 388 n/a
49
Southwest Transplant Allianceorgan.org

A nonprofit organization based in Dallas saving and healing lives through organ and tissue donation, serving over 10 million Texans

Hospitals and Health Care 馃嚭馃嚫 Dallas 355 1974
50
TBK Bank, SSBtbkbank.com

A Texas-based state savings bank offers commercial and consumer banking products in multiple states, specializing in real estate and business lending

Financial Services 馃嚭馃嚫 Dallas 352 n/a
51
Berry Corporationcrc.com

An independent, publicly traded energy company focused on acquiring, developing, and producing domestic oil and gas reserves in California and Utah

Oil and Gas 馃嚭馃嚫 Dallas 341 n/a
52
Susser Banksusserbank.com

Texas-based bank providing personal and commercial banking solutions for over 60 years, with a focus on community growth and exceptional customer service

Financial Services 馃嚭馃嚫 Dallas 332 1959
53
Vesper Energyvesperenergy.com

Develops, owns, and operates renewable energy and energy storage facilities nationwide, focusing on sustainability and collaboration to drive innovative solutions

Renewable Energy Semiconductor Manufacturing 馃嚭馃嚫 Dallas 69 n/a
54
One World Bankoneworldbank.com

This company provides personalized and customized financial services, offering a world of resources to meet personal and business needs

Financial Services 馃嚭馃嚫 Dallas 54 2005
55
First National 1870firstnational1870.com

Providing financial solutions through a full range of relationship-focused services for personal, business, and wealth management objectives in various communities

Banking 馃嚭馃嚫 Dallas 45 1870
56
Hunt Consolidated, Inc.huntconsolidated.com

A Dallas-based company focused on exploring, developing, and refining oil and gas through its various subsidiaries and overseas operations

Oil and Gas 馃嚭馃嚫 Dallas 36 1934
57
Aspen Midstreamaspenmidstream.com

An independent energy company providing comprehensive midstream solutions including natural gas gathering, processing, compression, treating, and condensate stabilization in North America

Oil and Gas 馃嚭馃嚫 Dallas 34 n/a
58
HEYCO Energy Groupheycoenergy.com

Privately-owned upstream energy company providing strategy, technology, and capital for oil and gas exploration projects in the US and Europe

Oil and Gas 馃嚭馃嚫 Dallas 25 1969
59
Panhandle Eastern Pipe Line Co LP.peplmessenger.energytransfer.com

An oil and energy company located in Dallas, TX, specializing in pipeline services in the United States

Oil and Gas 馃嚭馃嚫 Dallas 19 n/a
60
Coyote Midstreamcoyotemidstream.com

Independent energy infrastructure provider offering innovative solutions for producers and refiners, specializing in liquids, gas, and water gathering, transportation, and terminaling Led by experienced management team

Oil and Gas 馃嚭馃嚫 Dallas 3 2017
61
NEP Midstream and Royaltiesnepmidstream.com

Investing in pipeline and energy logistics assets focused on transporting, gathering, processing, and storing crude oil, natural gas, and NGLs

Oil and Gas 馃嚭馃嚫 Dallas 1 2009

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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 Oct 24, 2026.

More company lists in Dallas

The same list elsewhere in United States