These Ohio-based companies primarily operate in environmental services, manufacturing, and government administration, with a notable presence of established mid-sized to large organizations. Companies like The Davey Tree Expert Company and Rumpke Waste & Recycling specialize in environmental solutions, while Greif is a global leader in industrial packaging. Babcock & Wilcox focuses on energy and environmental technologies, and MPW Industrial Services provides industrial cleaning and water purification.
A significant portion of the listed companies are headquartered in cities across Ohio, including Columbus, Cincinnati, and Cleveland. This indicates a geographical spread rather than a single urban cluster for these operations. Several organizations, such as Greif (founded 1877), The Davey Tree Expert Company (founded 1880), and Babcock & Wilcox (founded 1867), have a long history, suggesting a mature industrial base.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 5,352 | ||||
| 2 |
City of Columbuscolumbus.gov
A government entity in Columbus, Ohio, working to provide high-quality services, support economic development, and maintain vibrant neighborhoods for residents |
3,819 | |||
| 3 |
The Davey Tree Expert Companydavey.com
The organization provides research-driven tree services, grounds maintenance, and environmental solutions for various partners, focusing on sustainability and exceeding client expectations |
3,268 | |||
| 4 |
Babcock & Wilcoxbabcock.com
A global leader in energy and environmental technologies and services for power, renewable, and industrial markets, with a history of over 150 years |
2,627 | |||
| 5 |
Rumpke Waste & Recyclingrumpke.com
A waste and recycling company founded in 1932, providing environmentally friendly solutions to residential and commercial areas in Ohio, Kentucky, Indiana, and West Virginia |
1,731 | |||
| 6 |
MPW Industrial Servicesmpwservices.com
A leading provider of industrial cleaning, water purification, facility management, and waste services in North America, enhancing efficiency, reliability, and cost-effectiveness for various industries |
1,679 | |||
| 7 |
Davey Resource Group, Inc.davey.com
The company provides innovative solutions and expertise to a diverse range of clients in industries such as utilities, transportation, telecommunications, and government |
1,605 | |||
| 8 |
DJJ-The David J Joseph Companydjj.com
A world leader in scrap metal recycling and trading, with a strong reputation for safety, integrity, innovation, and environmental responsibility |
1,328 | |||
| 9 |
City of Toledotoledo.oh.gov
The organization focuses on enhancing the quality of life for residents, implementing forward-thinking policies, and driving economic development within the city |
966 | |||
| 10 |
Eurofins TestAmericatestamericainc.com
Leading environmental testing firm with over 80 nationwide locations, offering innovative technical expertise and comprehensive analytical testing services Commitment to employee growth and success |
866 | |||
| 11 |
Northeast Ohio Regional Sewer Districtneorsd.org
This company in Northeast Ohio manages wastewater and stormwater to protect public health and the environment through treatment programs and projects |
488 | |||
| 12 |
Kinetico Incorporatedkinetico.com
Design and distribution of non-electric, fully automatic water treatment systems providing high-quality water for general and drinking use worldwide. |
453 | |||
| 13 |
Real Alloyrealalloy.com
A leading provider of third-party aluminum recycling and alloy production, offering a wide range of aluminum products delivered to customers across industries |
444 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 14 |
Independence Excavating, Inc.indexc.com
A trusted industry leader in heavy civil construction, demolition, industrial applications, environmental remediation, concrete work, aggregate recycling, and paving |
396 | |||
| 15 |
City of Canton, Ohiocantonohio.gov
The City of Canton, Ohio offers various opportunities and benefits of big-city living, while maintaining a charming small town feel |
366 | |||
| 16 |
Southern Ohio Cleanup Companyteamsocco.com
Company specializes in decontamination and decommissioning of Portsmouth Gaseous Diffusion Plant Combining project management, nuclear operations, local partnerships for successful operations |
360 | |||
| 17 |
CTL Engineering, Inc.ctleng.com
A consulting engineering company offering testing, inspection, and analytical services in various industries across the Mid-Atlantic and Midwestern states |
336 | |||
| 18 |
Kimble Companieskimblecompanies.com
A family-owned business in Eastern Ohio providing outstanding refuse and recycling services with a focus on sustainability, community involvement, and customer care |
334 | |||
| 19 |
Performance
A comprehensive site services company offering environmental solutions, dirt logistics, training programs for heavy equipment operators and truck drivers, backed by experienced professionals, passion, and robust processes |
331 | |||
| 20 |
Superior Environmental Solutions, LLCsesinc.com
Industrial cleaning service provider offering waste management solutions with trained personnel for routine maintenance, plant outages, shutdown projects, and emergency response services |
330 | |||
| 21 |
City of Hamilton, Ohiohamilton-oh.gov
A city in Ohio with a rich history, committed to progress, owning and operating all major utilities, generating power from renewable resources, and known for exceptional water quality |
326 | |||
| 22 |
Valicorvalicor.com
A leading provider of non-hazardous wastewater treatment services in North America, focusing on sustainable waste management solutions through recycling and conversion |
318 | |||
| 23 |
Regency Technologiesregencytechnologies.com
Specializing in IT asset conversion and recycling, we provide safe, sustainable solutions including logistics, data security, electronics recycling, equipment sales, and more |
185 | |||
| 24 |
Winelco Inc.winelco.com
This company offers comprehensive environmental solutions for water and wastewater treatment in residential, commercial, and municipal settings, from design to maintenance |
21 | |||
| 25 |
Quasar Energy Groupquasareg.com
A Cleveland-based firm specializing in renewable energy and organics management, deploying sustainable technology solutions in agricultural, municipal, and industrial sectors |
16 | |||
| 26 |
Shale Mountain ResourcesShaleMountainResources.com
Comprehensive energy service provider to the oilfield industry, offering innovative solutions with a focus on safety, efficiency, and top performance |
9 | |||
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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 Nov 12, 2026.
More company lists in Ohio
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- Companies with in-house R&D in Ohio 277
- Hardware manufacturers in Ohio 233
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- Education providers in Ohio 223
- Professional services firms in Ohio 195
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- Financial services firms in Ohio 162
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The same list elsewhere in United States
- Environmental services companies in Texas 98
- Environmental services companies in California 95
- Environmental services companies in Florida 58
- Environmental services companies in New York State 39
- Environmental services companies in North Carolina 37
- Environmental services companies in Pennsylvania 35
- Environmental services companies in Illinois 34
- Environmental services companies in Washington State 29
- Environmental services companies in Alabama 25