317-622-8970Search all companies →Largest Industrial & Mechanical Companies in District of Columbia (2026)
Factur's directory lists 90,636 industrial & mechanical companies in District of Columbia. These are the 10 largest of them by annual revenue, led by US Department of Transportation ($299.2B), United States Navy ($248B) and US Department of Agriculture ($228.3B).
Size mix: of the 90,628 with a known headcount, 95.7% have 1-50 employees, 3.3% 51-200, 766 companies 201-1000, 112 companies 1001-5000 and 66 companies 5001+. 380 employ more than 500 people.
The 10 largest industrial & mechanical companies in District of Columbia by annual revenue
| # | Company | City | Employees | Annual revenue |
|---|---|---|---|---|
| 1 | US Department of Transportation | Washington | 55,000 | $299.2B |
| 2 | United States Navy | Washington | 562,000 | $248B |
| 3 | US Department of Agriculture | Washington | 100,000 | $228.3B |
| 4 | US Air Force | Washington | 689,000 | $217.5B |
| 5 | The Defense Credit Union | Washington | 1,611,000 | $168.6B |
| 6 | The SBA | Washington | 6,373 | $107.2B |
| 7 | Department of Homeland Security | Washington | 260,000 | $97.3B |
| 8 | US Department of Health and Human Services | Washington | 80,000 | $95.4B |
| 9 | US Marine Corps | Washington | 184,000 | $88.1B |
| 10 | US Department of Education | Washington | 4,400 | $68B |
How this list is ranked
Companies are ranked by annual revenue (USD) as recorded on each company's profile in the Factur directory, highest first; companies with the same revenue are ordered by employee count. Only companies with a positive revenue figure on file are ranked, so a large private company with no reported revenue can be missing. The list covers companies whose record places them in District of Columbia and whose Factur industry is Industrial & mechanical. Figures are a snapshot of the directory, refreshed when the rankings are regenerated; open a profile for its current data.