| # | Company | Employees |
|---|---|---|
| 1 |
The Marzetti Companymarzetticompany.com
Specialty food manufacturer and marketer for retail and foodservice markets, offering a variety of brands and products, focusing on innovation and quality |
1,372 |
| 2 |
Kokosingkokosing.biz
Family-owned construction firm in the Midwest and Mid-Atlantic region, specializing in innovative solutions and self-performing up to 80% of project work |
1,272 |
| 3 |
Otterbein Universityotterbein.edu
An inclusive community focused on educating individuals with a blend of liberal arts and professional studies, emphasizing experiential learning for personal and professional growth |
1,156 |
| 4 |
Westerville City Schoolswesterville.k12.oh.us
A school district in Central Ohio catering to over 14,000 students, providing education and support services |
1,145 |
| 5 |
Ohio Livingohioliving.org
A leading not-for-profit organization providing senior living, healthcare, hospice, and charitable services to over 10 million Ohio residents |
884 |
| 6 |
Crown Staffingcrownstaffing.com
A staffing company providing innovative personnel solutions to companies and individuals in the Midwest and southern United States since 1968 |
873 |
| 7 |
Central Ohio Primary Carecopcp.com
A leading primary care provider in Central Ohio, focused on offering the best patient care through innovative practices and services |
844 |
| 8 |
Revolution Mortgagerevolutionmortgage.com
Nationwide lender offering lower rates and payments for refinancing and home purchase loans, with enhanced efficiency and a seamless online lending experience |
519 |
| 9 |
Foundations Health Solutionsfoundationshealth.net
A compassionate long-term care provider in Ohio, dedicated to superior resident outcomes by focusing on staff, resident, and family needs |
472 |
| 10 |
Odd Jobscolumbusoddjobs.com
Professional Handyman Services offering a full spectrum of home repairs and maintenance to save money and provide comprehensive services for all repair needs |
470 |
| 11 |
City of Westervillewesterville.org
Providing excellent resident services, maintaining parks, supporting job creation, ensuring public safety, and fostering community growth and quality of life. |
467 |
| 12 |
CK Constructionckbuilds.com
Self-performing general contractor and construction manager in the Midwest since 1956, specializing in concrete, steel erection, carpentry, and millwork for various markets |
422 |
| 13 |
DevCare Solutionsdevcare.com
A premier IT solutions provider offering cutting-edge technology solutions, IT/non-IT staff augmentation services, and unique processes with certifications in quality and diversity |
410 |
| 14 |
Heitmeyer Consultingheitmeyerconsulting.com
Provides advisory, consulting, and strategic staffing services for banking and insurance sectors, focusing on mergers, digital transformation, payments, and specialized technical recruitment. |
325 |
| 15 |
Electrical Reliability Services, Inc.electricalreliabilityservices.com
Industry-leading electrical engineering and testing company established in 1971, providing a wide range of services nationwide, including arc flash testing, electrical maintenance, and renewable energy services |
318 |
| 16 |
Columbus and Franklin County Metro Parksmetroparks.net
An independent agency in Central Ohio providing over 20 natural area parks with trails, educational programs, and conservation efforts |
186 |
| 17 |
Hondros Education Grouphondros.com
A national leader in education and real estate services, offering mortgage, appraisal, insurance, home inspection, exam prep, and fingerprinting since 1981 |
173 |
| 18 |
Vineyard Columbusvineyardcolumbus.org
The company is dedicated to creating diverse communities centered around experiencing God, loving others, and collaborating with Christ to bring healing to the world |
172 |
| 19 |
Century Insurance Groupcenturysurety.com
Specialty insurer providing general liability, commercial property, and multi-peril insurance for small and mid-sized businesses through excess and surplus lines |
170 |
| 20 |
VPLgetvpl.com
A leading platform specializing in healthcare supply chain management and pharmacy shipping workflows, offering tools for freight handling, real-time tracking, and data visualization |
153 |
| 21 |
Kokosing Industrialkokosingindustrial.com
A Midwest contractor specializing in self-performing services for power, oil & gas, heavy industrial, marine, civil, and water/wastewater projects |
149 |
| 22 |
Geotechnical Consultants, Inc.gci2000.com
Professional geo-engineering firm providing geotechnical, environmental, and construction engineering services, with expertise in remote Time Domain Reflectometry for earth displacement measurement |
149 |
| 23 |
The Champion Companiesthechampioncompanies.com
A privately-held firm specializing in real estate and private equity investments, with a diverse portfolio and a focus on community philanthropy |
102 |
| 24 |
123 Exteriors123exteriors.com
A full-service exterior remodeling company specializing in residential and commercial projects, focusing on integrity, honesty, and quality in every aspect of their work |
66 |
| 25 |
Fab Glass and Mirrorfabglassandmirror.com
A rapidly growing company specializing in manufacturing and distributing glass and mirror products, with a focus on quality, affordability, and exceptional customer service |
54 |
| 26 |
Green Event Solutionsgrso.org
The company seeks innovative eco-friendly technology solutions with the potential to make a global impact on sustainability and environmental conservation |
3 |
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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.
The same list elsewhere in United States
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- The largest companies in Florida 4,945
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- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
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- The largest companies in Alabama 1,806
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- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
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