Professional Services Companies in Maryland: 49 Verified Firms
Secwyn has verified 49 professional services companies based in Maryland. The largest groups are Temporary Help Services (15); Engineering Services (14); and Employment Placement Agencies (8). By headcount, 73% have 51–200 employees, 19% have 201–500 employees, and 8% fall in other size bands. Size is not yet confirmed for 1. Baltimore has the most (7), followed by Columbia (3) and Lanham (3).
Company size
- 11–50 employees2 · 4%
- 51–200 employees35 · 71%
- 201–500 employees9 · 18%
- 501–1,000 employees2 · 4%
- Size not confirmed1 · 2%
Top cities
- Baltimore7 · 14%
- Columbia3 · 6%
- Lanham3 · 6%
- Rockville3 · 6%
Cities with fewer than 3 companies are not listed.
Largest sub-industries
| Sub-industry | NAICS | Companies |
|---|---|---|
| Temporary Help Services | 561320 | 15 |
| Engineering Services | 541330 | 14 |
| Employment Placement Agencies | 561311 | 8 |
| Landscaping Services | 561730 | 6 |
| Architectural Services | 541310 | 2 |
| Janitorial Services | 561720 | 2 |
| Administrative Management and General Management Consulting Services | 541611 | 1 |
| Other Services to Buildings and Dwellings | 561790 | 1 |
A sample of these companies
A few of the 49 professional services companies in Maryland. Names, websites and contacts are shown after you sign up.
Company #1 · name shown after sign-up
Temporary Help Services · 51–200 employees
Company #2 · name shown after sign-up
Employment Placement Agencies · 51–200 employees
Company #3 · name shown after sign-up
Engineering Services · 201–500 employees
Company #4 · name shown after sign-up
Landscaping Services · 51–200 employees
Company #5 · name shown after sign-up
Administrative Management and General Management Consulting Services · 51–200 employees
Company #6 · name shown after sign-up
Janitorial Services · 201–500 employees · Lanham
Find the Maryland 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.
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.