SECWYN

Professional Services Companies in Ohio: 78 Verified Firms

Secwyn has verified 78 professional services companies based in Ohio. The largest groups are Temporary Help Services (27); Engineering Services (20); and Employment Placement Agencies (9). By headcount, 76% have 51–200 employees, 17% have 201–500 employees, and 7% fall in other size bands. Size is not yet confirmed for 2. Cincinnati has the most (16), followed by Columbus (11) and Toledo (6).

Company size

  • 11–50 employees1 · 1%
  • 51–200 employees58 · 74%
  • 201–500 employees13 · 17%
  • 501–1,000 employees4 · 5%
  • Size not confirmed2 · 3%

Top cities

  • Cincinnati16 · 21%
  • Columbus11 · 14%
  • Toledo6 · 8%
  • Cleveland3 · 4%

Cities with fewer than 3 companies are not listed.

Largest sub-industries

Sub-industryCompanies
Temporary Help Services27
Engineering Services20
Employment Placement Agencies9
Architectural Services8
Landscaping Services4
Executive Search Services2
Facilities Support Services2
Janitorial Services2

A sample of these companies

A few of the 78 professional services companies in Ohio. Names, websites and contacts are shown after you sign up.

  1. Company #1 · name shown after sign-up

    Other Services to Buildings and Dwellings · 51–200 employees · Cincinnati

  2. Company #2 · name shown after sign-up

    Employment Placement Agencies · 51–200 employees

  3. Company #3 · name shown after sign-up

    Temporary Help Services · 51–200 employees · Toledo

  4. Company #4 · name shown after sign-up

    Engineering Services · 501–1,000 employees · Columbus

  5. Company #5 · name shown after sign-up

    Architectural Services · 51–200 employees · Cleveland

  6. Company #6 · name shown after sign-up

    Facilities Support Services · 51–200 employees

Find the Ohio professional services companies that fit what you sell

Describe what you sell and Secwyn shows the companies most likely to buy it, with the reasons for each match. Sign up free and your first 3 company reveals are on us: name, website, description with its source, contact channels and the roles to contact.

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How Secwyn verifies these companies

  • Every company description is a sentence visible on the company's own website. Inside the product, each one links to its source page.
  • Each company has a NAICS industry code, the US government standard for classifying businesses.
  • All companies are based in the United States. Location and size come from public sources, including company filings and People Data Labs.

Data updated October 6, 2026.