| # | Company | Employees |
|---|---|---|
| 1 |
Chicago Public Schoolscps.edu
Provides education to over 340,000 students across more than 600 schools, focusing on college, career, and life readiness. |
38,314 |
| 2 |
University of Illinois Urbana-Champaignillinois.edu
Leading public university with strong focus on education, research, global student opportunities, faculty innovation, and significant economic and community impact. |
24,692 |
| 3 |
University of Chicagouchicago.edu
A prestigious academic institution encouraging scholars and students to think critically, explore various disciplines, and challenge conventional ideas for global enrichment |
18,526 |
| 4 |
University of Illinois Chicagouic.edu
A large university in Chicago with 33,000 students, 12,000 employees, 16 colleges, and a public medical center |
17,943 |
| 5 |
Rush University Medical Centerrush.edu
Academic medical center with hospital, health center, university offering medical, nursing education, research, residency programs, and community outreach services. |
12,484 |
| 6 |
OSF HealthCareosfhealthcare.org
Integrated health system with hospitals, home care, nursing colleges, digital health services, philanthropic foundation, and healthcare innovation investments. |
12,433 |
| 7 |
Advocate Health Careadvocatehealth.com
Integrated nonprofit health system providing clinical innovation, specialized care, extensive research, education, and community benefits across multiple U.S. states. |
11,676 |
| 8 |
Northwestern Memorial Hospitalnmh.org
A collaboration between healthcare and university partners, Northwestern Medicine aims to transform healthcare through research, teaching, and patient care excellence |
7,371 |
| 9 |
Loyola University Chicagoluc.edu
Private Jesuit Catholic university offering diverse undergraduate, graduate, and professional programs across multiple campuses including Chicago and Rome. |
7,315 |
| 10 |
Ann & Robert H. Lurie Children's Hospital of Chicagoluriechildrens.org
Largest pediatric healthcare provider in the region, teaching partner of Northwestern University, nationally ranked in all pediatric specialties. |
7,202 |
| 11 |
Carle Healthcarle.org
Integrated healthcare system combining clinical care, insurance, research, education, and philanthropy to improve patient outcomes and community health. |
6,896 |
| 12 |
DeVry Universitydevry.edu
Dedicated to innovative learning approaches with 90+ years of experience in diverse degree programs, providing student support and resources for success |
6,886 |
| 13 |
DePaul Universitydepaul.edu
Provides diverse, rigorous education with small classes, strong community partnerships, service learning, and support for first-generation students in Chicago. |
6,538 |
| 14 |
Northern Illinois Universityniu.edu
This company offers a high-quality education focused on personal, career, and life success through various opportunities like internships, research, and student organizations |
6,335 |
| 15 |
Illinois State Universityillinoisstate.edu
Offering more than 160 fields of study to prepare diverse individuals in becoming informed members of society through collaborative teaching, scholarship, and service |
5,799 |
| 16 |
Adtalem Global Educationcovista.com
A leading medical and healthcare education provider, focusing on workforce talent needs through education, certifications, upskilling programs with a diverse, inclusive approach |
5,688 |
| 17 |
Southern Illinois University, Carbondalesiu.edu
Provides comprehensive academic instruction through associate, bachelor, master, doctoral, and professional degrees in law and medicine to students from across the globe. |
5,571 |
| 18 |
School District U-46u-46.org
A school district in the northwest suburbs of Chicago covering 90 square miles, serving nearly 35,000 students in grades preK-12 |
4,217 |
| 19 |
Northwestern University - The Feinberg School of Medicinefeinberg.northwestern.edu
A renowned medical school in Chicago offering MD programs, research, patient care, and community service to educate future physicians |
4,009 |
| 20 |
Wyzantwyzant.com
Connecting individuals with over 80,000 tutors in 300+ subjects for tailored 1-to-1 lessons to help achieve academic and career goals |
3,698 |
| 21 |
Chamberlain Universitychamberlain.edu
Provides accredited nursing and health professions degrees with a focus on care, service excellence, and empowering diverse healthcare professionals. |
3,522 |
| 22 |
Northwestern University - Kellogg School of Managementkellogg.northwestern.edu
An institution specializing in developing leaders through MBA programs, executive education, and degree options with focus on analytical, creative, and social skills |
3,520 |
| 23 |
Southern Illinois University Edwardsvillesiue.edu
A nationally recognized university offering quality undergraduate education with a focus on developing professional and community leaders through excellent faculty and programs |
3,509 |
| 24 |
Midwestern Universitymidwestern.edu
Not-for-profit graduate institution offering health science degrees including medicine, pharmacy, therapy, psychology, nursing, dentistry, optometry, and veterinary medicine |
3,419 |
| 25 |
Illinois Institute of Technologyiit.edu
Research university offering engineering, science, architecture, design, business, and law programs focused on interprofessional education, global scholarship, and invention for professional achievement. |
3,090 |
| 26 |
Private Tutoringnwbaker-tutoring.weebly.com
The company provides tutoring services for younger students, focusing on homework help and test preparation in grammar schools |
3,012 |
| 27 |
UI Healthhospital.uillinois.edu
This academic health enterprise in Illinois offers comprehensive care, education, and research to promote health equity and train healthcare leaders |
2,813 |
| 28 |
Kaplan Universitypurdueglobal.edu
A regionally accredited university providing flexible higher education options for adult students, offering online programs and master's degrees Acquired by Purdue University |
2,770 |
| 29 |
American Marketing Associationama.org
Provides marketing and sales professionals with industry insights, professional certification, academic journals, training, and conferences through a global community. |
2,669 |
| 30 |
Columbia College Chicagocolum.edu
A private, nonprofit college in Chicago offering a unique curriculum blending creative and media arts, liberal arts, and business for students seeking long-term career success |
2,603 |
| 31 |
Western Illinois Universitywiu.edu
Provides student-centered undergraduate and graduate programs with innovative teaching, research, and service, guided by diverse faculty, alumni, and community partnerships |
2,583 |
| 32 |
Eastern Illinois Universityeiu.edu
This company has been supporting student success since 1895 with expert faculty, research opportunities, student organizations, and a 320-acre campus |
2,555 |
| 33 |
University of Illinois Systemuillinois.edu
The company is a flagship public university system in Illinois, offering excellence in education, healthcare, research, and economic development to the community |
2,436 |
| 34 |
The University of Chicago Booth School of Businesschicagobooth.edu
A prestigious business school focused on turning innovative ideas into impactful actions, cultivating leaders with curiosity, analytical thinking, collaboration, and boldness |
2,349 |
| 35 |
Career Education Corporationperdoceoed.com
Educational services company offering diverse learning formats (online, campus-based, blended) through AIU and CTU with innovative technology and personalized courses |
2,250 |
| 36 |
Government Finance Officers Association (GFOA)gfoa.org
Premier association for public-sector finance professionals in the US and Canada, providing leading practices in government financial management through education and training |
2,179 |
| 37 |
College of Lake Countyclcillinois.edu
A comprehensive community college offering credit and non-credit programs, GED classes, and specialized services for students and businesses Connect to your future |
2,176 |
| 38 |
Shirley Ryan AbilityLabsralab.org
Specializes in treating severe physical disabilities through integrated clinical care and research, improving recovery for complex conditions. |
2,124 |
| 39 |
Bradley Universitybradley.edu
Bradley University offers a wide range of undergraduate and graduate programs in various fields, focusing on innovation, excellence, and embracing progress |
2,099 |
| 40 |
Harper Collegeharpercollege.edu
Harper College offers a wide range of certificate programs and associate degrees, providing education for career training and transfer to four-year institutions |
2,077 |
| 41 |
School of the Art Institute of Chicagosaic.edu
A prestigious art and design school in Chicago with top-ranked graduate program, interdisciplinary approach, world-class resources, and notable alumni and faculty |
2,059 |
| 42 |
City Colleges of Chicagoapply.ccc.edu
A large community college system in Illinois, serving over 80,000 students annually with multiple locations and specialized programs in various fields |
2,035 |
| 43 |
National Louis Universitylinktr.ee
With over 125 years of experience, this organization offers progressive and professional education to help build careers and empower communities |
1,983 |
| 44 |
Northeastern Illinois Universityneiu.edu
A diverse and innovative educational institution offering a wide range of undergraduate and graduate programs with a focus on affordability and inclusivity |
1,952 |
| 45 |
Right At Schoolrightatschool.com
This company provides safe and fun extended day enrichment programs for students, hiring educators and offering competitive rates, professional development, and benefits |
1,931 |
| 46 |
Lewis Universitylewisu.edu
Private Catholic university providing undergraduate and graduate programs focused on intellectual engagement, ethical grounding, and global social responsibility. |
1,898 |
| 47 |
Indian Prairie School District 204ipsd.org
One of the largest school districts in Illinois, serving 28,500 students across 33 schools in Naperville, Aurora, Bolingbrook, and Plainfield |
1,847 |
| 48 |
Wheaton Collegewheaton.edu
An explicitly Christian, academically rigorous liberal arts college and graduate school offering over 40 undergraduate and 14 graduate degrees Located in Illinois |
1,785 |
| 49 |
Blessing Healthblessinghealth.org
An integrated health system with hospitals, provider groups, specialty businesses, nursing college, and charitable foundation providing high-quality care to communities |
1,758 |
| 50 |
Archdiocese of Chicagoarchchicago.org
A prominent Catholic organization in Chicago with a focus on education, social services, immigrant ministry, violence prevention, and career opportunities within the Church |
1,710 |
| 51 |
The Chicago Schoolthechicagoschool.edu
A leading institution in psychology and behavioral science education, offering over 40 degree programs across multiple campuses and online |
1,689 |
| 52 |
Dominican Universitydom.edu
The company provides highly regarded academic programs in a values-based learning environment with a focus on affordability and social mobility |
1,657 |
| 53 |
DeVry Education Groupadtalem.com
A company in the education sector recently rebranded as Adtalem Global Education, offering a variety of educational programs and services |
1,651 |
| 54 |
American College of Surgeonsfacs.org
Dedicated to improving surgical patient care worldwide with membership opportunities, quality programs, surgical registries, and education to enhance outcomes |
1,644 |
| 55 |
American Hospital Associationaha.org
National organization representing hospitals, health care networks, and patients Advocates for members in health policy, legislative debates, and regulatory matters Visit website for more information |
1,614 |
| 56 |
American Dental Associationada.org
Advocates for dentists, dental science, public oral health. Provides resources for professionals, researches, and champions public health initiatives. |
1,599 |
| 57 |
SIU Medicinesiumed.edu
A leading medical school and clinical provider offering innovative medical education, research, and quality health care in diverse work environments |
1,597 |
| 58 |
Governors State Universitygovst.edu
Public university offering sixty-four degree and twenty-four certificate programs preparing diverse students for careers in business, healthcare, arts, and global education. |
1,578 |
| 59 |
Chicago State Universitycsu.edu
A public university in Chicago offering diverse undergraduate and graduate programs to prepare students for success in the twenty-first century |
1,523 |
| 60 |
Plainfield Community Consolidated School District #202psd202.org
A suburban school system in Illinois providing creative education to ensure all students reach their full potential in various communities |
1,509 |
| 61 |
Waukegan Public Schoolswps60.org
A public school district serving 17,000 students from kindergarten to twelfth grade, encompassing a total of two dozen schools |
1,445 |
| 62 |
Olivet Nazarene Universityolivet.edu
A premier Christian college offering superior academics, athletics, and ministry opportunities where students learn to make a living and live faithfully |
1,437 |
| 63 |
Moraine Valley Community Collegemorainevalley.edu
A college dedicated to educating the whole person in a global, multicultural community through excellence in teaching, service, and continuous improvement |
1,432 |
| 64 |
Aurora Universityaurora.edu
Inclusive community offering bachelor's, master's, and doctoral programs at main campus, online, and partnerships, accrediting degrees across various fields |
1,426 |
| 65 |
Abbott Nutrition Health Institute (ANHI)anhi.org
A platform offering over 150 free accredited courses for healthcare professionals on nutrition topics to improve patient outcomes and global health |
1,416 |
| 66 |
Joliet Junior Collegejjc.edu
A public community college offering diverse programs to over 35,000 students, helping them pursue their career goals through quality education and support |
1,410 |
| 67 |
Rosalind Franklin University of Medicine and Sciencerosalindfranklin.edu
graduate institution specializing in interprofessional health sciences education, offering medical, pharmacy, podiatry, and allied health professional degrees with research facilities |
1,400 |
| 68 |
Superior Ambulance Servicesuperiorambulance.com
A family-owned EMS provider with over 1600 employees and 200 ambulances, offering services in Illinois, Indiana, and Michigan since 1959 |
1,398 |
| 69 |
University of Illinois Springfielduis.edu
Educating public servants and leaders is a core focus of this university, which is part of the U of I system |
1,379 |
| 70 |
Naperville Community Unit School District 203naperville203.org
The company focuses on educating students to be self-directed learners, collaborative workers, complex thinkers, quality producers, and community contributors |
1,379 |
| 71 | 1,378 | |
| 72 |
North Central Collegenorthcentralcollege.edu
A college in Illinois offering a wide range of undergraduate and graduate programs, known for its top-notch facilities and programs |
1,374 |
| 73 |
Oakton Collegeoakton.edu
A community college in Illinois offering education and training through its campuses in Des Plaines and Skokie since 1969 |
1,355 |
| 74 |
Augustana Collegeaugustana.edu
Offers 90 majors, small classes, and experiential learning via study abroad, internships, or research opportunities for students. |
1,340 |
| 75 |
Follettfollett.com
A trusted partner for schools, colleges, and campus bookstores, providing education technology, services, and content to support teaching, learning, and celebrating |
1,336 |
| 76 |
CompTIAcomptia.org
An organization representing IT industry members, offering educational programs, research, certifications, and advocacy to advance industry growth and benefit organizations |
1,325 |
| 77 |
Peoria Public Schoolspeoriapublicschools.org
Transforming Peoria Public Schools by emphasizing high standards, personalized instruction, technology integration, diverse curriculum, and community partnerships for student success in a global economy |
1,325 |
| 78 |
Sigma Alpha Epsilon Fraternitysae.net
This organization promotes friendship, scholarship, leadership, and service for lifelong members |
1,299 |
| 79 |
College of American Pathologists (CAP)cap.org
An organization of pathologists dedicated to excellence in pathology and laboratory medicine, advocating for health advancements and shaping the future of healthcare |
1,297 |
| 80 |
Township High School District 214d214.org
District 214 is Illinois' largest high school district with six high schools and three specialized schools, focusing on preparing students for their future |
1,296 |
| 81 |
Bravenbraven.org
Empowering underrepresented young talent through a career readiness course and alumni programming, with a focus on skills, experience, coaching, and networking |
1,292 |
| 82 |
Schaumburg School District 54sd54.org
Community Consolidated School District 54 prioritizes student success through high expectations, support, professional development, and a collaborative culture for educators |
1,287 |
| 83 |
Triton Collegetriton.edu
A company focused on valuing individuals, educating the community, and promoting equitable opportunities for growth and success |
1,278 |
| 84 |
Elgin Community Collegeelgin.edu
An accredited community college offering comprehensive degree and certificate programs, affordable tuition, small classes, and student support services for success |
1,267 |
| 85 |
RPS 205rps205.com
Large Illinois school district providing comprehensive education and career readiness programs for 28,700 students with 4,700 employees. |
1,237 |
| 86 |
Springfield Public Schools District 186sps186.org
The company collaborates with families and community to empower students to become responsible lifelong learners and citizens in a diverse world |
1,229 |
| 87 |
PreSales Collectivepresalescollective.com
The company aims to elevate the role of PreSales globally by providing resources, knowledge, networking, and mentorship for career development in PreSales |
1,202 |
| 88 |
American Academy of Pediatricsaap.org
A professional membership organization of pediatricians dedicated to promoting the health and well-being of infants, children, adolescents, and young adults through advocacy and education |
1,198 |
| 89 |
East Aurora School District 131d131.org
The company is dedicated to educating and empowering students to reach their full potential, creating confident global citizens committed to community improvement |
1,168 |
| 90 |
After School Mattersafterschoolmatters.org
A non-profit organization in Chicago offering after-school and summer programs to high school teens, focusing on skills development and opportunities |
1,160 |
| 91 |
Waubonsee Community Collegewaubonsee.edu
A two-year institution offering a variety of educational programs, including transfer, career education, developmental, and professional development classes at convenient locations |
1,160 |
| 92 |
Lake Forest Collegelakeforest.edu
This company empowers individuals to pursue their passions and build their dream careers by providing tools and support for personal growth and success |
1,157 |
| 93 |
IES Abroadiesabroad.org
A passionate team offering over 140 study abroad programs for college students, believing in life-changing opportunities in a safe, fun environment |
1,139 |
| 94 |
Illinois Central Collegeicc.edu
A community college in the greater Peoria area offering a wide range of programs, classes, continuing education, and athletic teams |
1,133 |
| 95 |
Southwestern Illinois Collegeswic.edu
A long-standing educational institution offering over 150 degree and certificate programs to prepare students for university transfer or workforce entry |
1,105 |
| 96 |
Saint Xavier Universitysxu.edu
Historic Catholic university offering diverse undergraduate and graduate programs with a second campus in Orland Park, Illinois Serving 4,000 students |
1,096 |
| 97 |
Champaign Unit 4 Schoolschampaignschools.org
Dedicated to guiding students to excel in a changing world by providing dynamic learning environments and experiences through valued lifelong learning |
1,091 |
| 98 |
SITEsiteglobal.com
Global organization supporting incentive travel industry, connecting travel to business results with professional development, certification, and business connections for members worldwide |
1,049 |
| 99 |
North Park Universitynorthpark.edu
A Christian university in Chicago offering undergraduate, graduate, and adult programs in various fields, integrating faith with education since 1891 |
1,039 |
| 100 |
Noble Schoolsnobleschools.org
A nonprofit organization in Chicago running 17 charter high schools and one middle school, serving over 12,000 students with a focus on college readiness and education equity |
1,029 |
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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 Illinois
- The largest companies in Illinois 4,175
- Hospitals and Health Care companies in Illinois 274
- Financial services firms in Illinois 267
- Manufacturers in Illinois 254
- IT Services and IT Consulting companies in Illinois 230
- Financial Services companies in Illinois 203
- Transportation, Logistics, Supply Chain and Storage companies in Illinois 195
- Critical infrastructure operators in Illinois 178
- Retail chains in Illinois 172
- SaaS companies in Illinois 172
- IT services companies in Illinois 166
- Healthcare providers in Illinois 140
- Higher Education companies in Illinois 139
- Logistics companies in Illinois 131
- Hardware manufacturers in Illinois 127
- Software Development companies in Illinois 126
- Truck Transportation companies in Illinois 123
- Insurance companies in Illinois 118
- Family-owned companies in Illinois 112
- Construction companies in Illinois 107
- Non-profit Organizations companies in Illinois 106
- Venture capital and private equity firms in Illinois 103
- Consulting firms in Illinois 96
- Contract manufacturers in Illinois 95
The same list elsewhere in United States
- Education providers in California 498
- Education providers in New York State 317
- Education providers in Texas 291
- Education providers in Pennsylvania 179
- Education providers in Massachusetts 160
- Education providers in Florida 135
- Education providers in Georgia 119
- Education providers in Virginia 118
- Education providers in North Carolina 114
- Education providers in Michigan 113
- Education providers in Ohio 112
- Education providers in Alabama 99
- Education providers in Washington State 94
- Education providers in Maryland 93
- Education providers in New Jersey 89
- Education providers in Arizona 86
- Education providers in Minnesota 81
- Education providers in Indiana 79
- Education providers in Missouri 70
- Education providers in Wisconsin 70
- Education providers in Tennessee 65
- Education providers in Colorado 62
- Education providers in New York 136
- Education providers in Washington 61