The professional services companies in Washington listed here are primarily large firms specializing in legal services and business consulting. Noteworthy examples include Hogan Lovells, a global legal team providing innovative solutions, and FTI Consulting, an expert firm offering crisis management and strategic solutions. Other significant companies are Jones Day, providing comprehensive legal services worldwide, and Chemonics International, an international development company with specialists in various sectors.
A recurring pattern among these companies is their global reach, with many operating internationally. For instance, Palladium: Make It Possible collaborates with governments and communities worldwide, and BRG provides interdisciplinary consulting globally. The dominance of legal practices and business consulting firms suggests a concentration of expertise in these fields within Washington.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
FTI Consultingfticonsulting.com
Global expert firm providing crisis management, transformation consulting, and strategic solutions to organizations facing complex business challenges worldwide. |
10,452 | |||
| 2 |
Hogan Lovellshoganlovells.com
Global team of 2,600+ lawyers providing innovative legal solutions for major industries worldwide, with a focus on diversity, community impact, and business strategy alignment |
7,724 | |||
| 3 |
Jones Dayjonesday.com
Provides comprehensive legal services worldwide through a large network of lawyers collaborating across multiple disciplines and jurisdictions. |
6,417 | |||
| 4 |
Chemonics Internationalchemonics.com
An international development company with 4,000 specialists globally, focusing on various sectors like agriculture, governance, health, and supply chain solutions |
3,985 | |||
| 5 |
Consilio LLCconsilio.com
Offers eDiscovery, document review, flexible legal talent, legal advisory, and transformation consulting services to law firms and corporations globally. |
3,639 | |||
| 6 |
Palladium: Make It Possiblethepalladiumgroup.com
Collaborates with governments, businesses, and communities to design and implement large-scale programs tackling climate, conflict, and inequality worldwide. |
2,845 | |||
| 7 |
Covington & Burling LLPcov.com
Global law firm providing expert legal services with commitment to clients, teamwork, diversity, public service, and complex business challenges. |
2,797 | |||
| 8 |
Arnold & Porterarnoldporter.com
A global law firm offering comprehensive legal services in regulatory, litigation, and transactional matters across various industries with a multidisciplinary approach |
2,470 | |||
| 9 |
BRGthinkbrg.com
Provides interdisciplinary consulting combining academic knowledge and business expertise in economics, disputes, corporate finance, and performance improvement globally. |
2,395 | |||
| 10 |
WilmerHalewilmerhale.com
A leading international law firm with over 1,000 lawyers in 13 offices worldwide, specializing in government, technology, and business law Promotes diversity and public service |
2,356 | |||
| 11 |
Gallupgallup.com
Provides analytics and advice to help leaders solve problems using over 85 years of experience and global insights on attitudes and behaviors |
2,320 | |||
| 12 |
BakerHostetlerbakerlaw.com
A leading law firm with top client service and legal expertise, offering assistance with complex business and regulatory issues worldwide |
2,291 | |||
| 13 | 2,131 | ||||
| 14 |
Venable LLPvenable.com
A global law firm with over 900 professionals offering legal services in regulatory compliance, government affairs, corporate transactions, IP, and complex litigation to empower clients |
1,914 | |||
| 15 |
APCOapcoworldwide.com
Global advisory and advocacy firm assisting organizations in building common ground to facilitate progress and achieve strategic goals effectively. |
1,817 | |||
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. | |||||
| 16 |
Crowell & Moringcrowell.com
International law firm providing legal services across multiple continents, specializing in litigation, arbitration, regulatory, corporate, and transactional issues Committed to pro bono work and diversity |
1,715 | |||
| 17 |
Versar Global Solutionsversar.com
A Washington, DC-based company provides full lifecycle solutions for government and commercial Customers in natural, built, and digital environments worldwide |
1,603 | |||
| 18 |
Pagepagethink.com
Multidisciplinary design, architecture, and engineering firm with 1,300+ staff and international offices Specializing in complex projects across various sectors Visit wwwpagethinkcom for more information |
1,448 | |||
| 19 |
InfoCeptsinfocepts.ai
Infocepts specializes in using data, AI, and user-friendly analytics to help clients overcome challenges and make better business decisions |
1,428 | |||
| 20 |
Hunton Andrews Kurth LLPhunton.com
A global law firm with 900+ lawyers offering comprehensive legal services in transactional, litigation, and regulatory matters across various industries and practice areas |
1,393 | |||
| 21 |
Steptoe LLPsteptoe.com
Provides international legal representation, litigation advocacy, arbitration, and practical business transaction advice with over 500 professionals worldwide. |
1,250 | |||
| 22 |
IRS, Office of Chief Counseljobs.irs.gov
A large tax firm with over 1,700 attorneys serving the IRS and the American public, promoting diversity, inclusion, and a balanced work environment |
1,114 | |||
| 23 |
ArentFox Schiffafslaw.com
Industry insiders offering practical business strategies and legal solutions to help clients reach their goals and anticipate future challenges |
1,004 | |||
| 24 |
Finnegan, Henderson, Farabow, Garrett & Dunner, LLPfinnegan.com
Provides comprehensive intellectual property legal services including litigation, patent strategy, and brand management with global presence and expertise. |
955 | |||
| 25 |
ENGIE Impactengieimpact.com
Sustainability solutions provider for corporations, cities, and governments worldwide, offering strategic and technical support to tackle complex sustainability challenges Leader in zero-carbon transition |
934 | |||
| 26 |
Gallagher & Mohangallaghermohan.com
Commercial real estate services firm specializing in globalizing operations, managing systems, and reducing back-office support costs for real estate companies worldwide |
903 | |||
| 27 |
LBSversar.com
Versar Global Solutions provides comprehensive lifecycle solutions for government and commercial clients in natural, built, and digital environments worldwide |
802 | |||
| 28 |
CIBTcorporate.cibt.com
Global provider of immigration and visa services for corporations and individuals with a team of experts in over 60 offices worldwide |
785 | |||
| 29 |
Compass Lexeconcompasslexecon.com
Provides economic consulting services to law firms, corporations, and governments, offering analysis for litigation, regulation, and strategic decisions. |
779 | |||
| 30 |
Navanavapbc.com
Nava is a consultancy and public benefit corporation dedicated to simplifying and improving government services through civic technology and inclusive design |
729 | |||
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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 11, 2026.
More company lists in Washington
- The largest companies in Washington 1,165
- Multinational companies in Washington 218
- Non-profit Organizations companies in Washington 145
- Education providers in Washington 109
- Government Administration companies in Washington 100
- Consulting firms in Washington 70
- Public sector organisations in Washington 65
- Subscription businesses in Washington 63
- IT Services and IT Consulting companies in Washington 55
- Media companies and publishers in Washington 52
- IT services companies in Washington 44
- Critical infrastructure operators in Washington 42
- Companies with in-house R&D in Washington 41
- Financial Services companies in Washington 41
- Law firms in Washington 41
- Financial services firms in Washington 40
- Business Consulting and Services companies in Washington 39
- SaaS companies in Washington 39
- Research institutes in Washington 38
- Venture capital and private equity firms in Washington 37
- Companies with a mobile app in Washington 36
- Healthcare providers in Washington 36
- Higher Education companies in Washington 36
- Law Practice companies in Washington 36
The same list elsewhere in United States
- Professional services firms in the United States 7,078
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 629
- Professional services firms in Florida 375
- Professional services firms in Virginia 344
- Professional services firms in Illinois 339
- Professional services firms in Massachusetts 249
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 172
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 135
- Professional services firms in Minnesota 125
- Professional services firms in New York 735
- Professional services firms in Chicago 196
- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Los Angeles 108