Companies in District of Columbia
145.2K companies registered in District of Columbia, sourced from official business registers and enriched with industry, size, location and contact data. Below: the largest companies by reported revenue, and how the District of Columbia business base breaks down by industry and headcount.
Part of the United States company directory.
Rankings
Largest companies in District of Columbia
By reported (actual) revenue, updated September 2026. Public-sector entities are excluded.
| # | Company | Industry | City | Revenue (USD) | Employees |
|---|---|---|---|---|---|
| 1 | Danaher Corporation | Manufacture of medical and dental instruments and supplies | Washington | $24.6B | 60,000 |
| 2 | Pepco Holdings LLC | Electric power generation, transmission and distribution | Washington | $7.1B | 4,422 |
| 3 | The Carlyle Group Inc | Trusts, funds and similar financial entities | Washington | $4.8B | 2,500 |
| 4 | The American National Red Cross | Other social work activities without accommodation n.e.c. | Washington | $3.8B | 34,978 |
| 5 | Fti Consulting, Inc. | Business and other management consultancy activities | Washington | $3.8B | 8,118 |
| 6 | Potomac Electric Power Company | Electric power generation, transmission and distribution | Washington | $3.5B | 1,374 |
| 7 | Gavi Alliance Unk | General medical practice activities | Washington | $2.5B | 10 |
| 8 | Opportunity Finance Network | Other social work activities without accommodation n.e.c. | Washington | $2.3B | 40 |
| 9 | National Association of Letter Carriers | Activities of trade unions | Washington | $2.2B | 533 |
| 10 | National Railroad Passenger Corporation | Freight rail transport | Washington | $2.1B | 18,650 |
| 11 | The Georgetown University | Tertiary education | Washington | $1.9B | 9,700 |
| 12 | Children's Hospital | Hospital activities | Washington | $1.8B | 6,000 |
| 13 | Washington Hospital Center Corporation | Combined office administrative service activities | Washington | $1.8B | 5,637 |
| 14 | Smithsonian Institution | Museums activities | Washington | $1.8B | 6,100 |
| 15 | The George Washington University | Tertiary education | Washington | $1.5B | 5,000 |
| 16 | Medstar-Georgetown Medical Center, Inc. | Tertiary education | Washington | $1.4B | 4,000 |
| 17 | Cava Group, Inc. | Restaurants and mobile food service activities | Washington | $1.2B | 13,480 |
| 18 | The Howard University | Tertiary education | Washington | $1.1B | 5,600 |
| 19 | District of Columbia Water & Sewer Authority | Water collection, treatment and supply | Washington | $1B | 1,100 |
| 20 | DC Water and Sewer Authority | Sewerage | Washington | $978M | 1,000 |
| 21 | American Chemical Society | Advertising agencies | Washington | $819M | 2,000 |
| 22 | Paypal Charitable Giving Fund | Activities of other membership organisations n.e.c. | Washington | $813M | 2 |
| 23 | American University | Tertiary education | Washington | $718M | 2,000 |
| 24 | American Foreign Service Protective Association | Activities of professional membership organisations | Washington | $687M | 64 |
| 25 | New Venture Fund | Activities of other membership organisations n.e.c. | Washington | $662M | 3 |
Top 25 by revenue reported to the register. Companies filing no revenue figure are not ranked, whatever their size.
Danaher Corporation leads District of Columbia at $24.6B in reported revenue, from Washington.
Coverage
Companies by industry in District of Columbia
The industries holding the most companies, by NACE activity code.
Ranked by number of companies. Each record carries its NACE code alongside SIC and NAICS, so the same segment can be pulled in any of the three schemes.
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Business and other management consultancy activities is the largest activity in District of Columbia, with 11,507 companies.
Distribution
Company size
By number of employees.
1,090 companies have no disclosed headcount (excluded from the chart).
82% of District of Columbia companies with a disclosed headcount fall in the 1-4 employee band.
Data coverage
What a District of Columbia record carries
Share of the state's companies holding each contact field.
32%
with a website
53%
with a phone number
18%
with an email address
Counted against the 145.2K companies in District of Columbia. Firmographics — industry, size, address, status — are present on every record.
FAQ
Companies in District of Columbia — frequently asked questions
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