Company lists · Data refreshed September 2026

Top 25 Big 5 consulting firms based in Washington, United States

Name: Big 5 consulting firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 331 companies tracked

RevenueBase identified 331 big 5 consulting firms headquartered in Washington, United States as of September 2026 and tracks 4,098 professional contacts across them, including 1,200 with verified work emails. Across the United States, New York is the largest hub for this category (587 companies); Washington has 331.

This list covers big 5 consulting firms headquartered in Washington, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 23, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 23, 2026 86% judged on-target in blind review

331Companies

4,098Contacts tracked

1,200Verified emails

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The 25 largest big 5 consulting firms based in Washington, United States

Ranked by team size

Top 25 of 331 big 5 consulting firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big 5 consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	IBM Promontory	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	501-1,000	403 contacts →
	Partial evidence “IBM Promontory is a global leader in strategy, risk management, and compliance consulting.#IBMConsulting” Source: RevenueBase Database · checked Sep 23, 2026
2	Kaiser Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	397 contacts →
	Indirect evidence “Kaiser Associates was founded in 1981 with a simple yet powerful mission: to help executives make more informed strategic and operational decisions by incorporating external…” Source: RevenueBase Database · checked Sep 23, 2026
3	TCG	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	263 contacts →
	Indirect evidence “Traditional we are not.” Source: RevenueBase Database · checked Sep 23, 2026
4	Techunity, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 23, 2026
5	Herren Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	142 contacts →
	Indirect evidence “Here at Herren, our goals are to drive efficiency and maximize the value of every dollar our clients spend.” Source: RevenueBase Database · checked Sep 23, 2026
6	DHA Group, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	135 contacts →
	Partial evidence “DHA is a full-service Information Technology and Consulting firm dedicated to providing mission-critical services to our Federal Government and commercial clients.” Source: RevenueBase Database · checked Sep 23, 2026
7	Telesolv Consulting	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	132 contacts →
	Indirect evidence “To become a demand business, an organization must constantly improve the value created by its core business processes.” Source: RevenueBase Database · checked Sep 23, 2026
8	Integrated Finance & Accounting Solutions Ifas	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	111 contacts →
	Indirect evidence “IFAS is a professional services firm that leverages technology to provide integrated financial management solutions and capabilities that include Program Budgeting & Cost…” Source: RevenueBase Database · checked Sep 23, 2026
9	The Cohen Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	110 contacts →
	Indirect evidence “Who We Are A talented team of experts with years of experience in both government and industry, with a passion for finding solutions and a deep understanding of the institutions…” Source: RevenueBase Database · checked Sep 23, 2026
10	Blue Water Thinking	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	91 contacts →
	Indirect evidence “Strategy, Management and Technology Consultancy” Source: RevenueBase Database · checked Sep 23, 2026
11	Censeo Consulting Group	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	84 contacts →
	Indirect evidence “Running an organization and executing plans is hard work.” Source: RevenueBase Database · checked Sep 23, 2026
12	Veracity Engineering	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	80 contacts →
	Indirect evidence “Since 2001, Veracity Engineering has been successful in building, growing, and performing on a portfolio of technically challenging engineering and program management engagements…” Source: RevenueBase Database · checked Sep 23, 2026
13	Willpower Consultation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	11-50	75 contacts →
	Indirect evidence “Willpower Consultation offers direct solutions for your corporate strategy.” Source: RevenueBase Database · checked Sep 23, 2026
14	Incapsulate	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	72 contacts →
	Partial evidence “Incapsulate, now a part of Accenture is a leading management and technology consulting firm with offices in Boston, D.C, and India.” Source: RevenueBase Database · checked Sep 23, 2026
15	Dantech Corporation INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	11-50	72 contacts →
	Indirect evidence “As organizations navigate the demands of today’s fast-moving IT landscape, Dantech stands as a trusted partner with the expertise to guide, implement, and optimize technology…” Source: RevenueBase Database · checked Sep 23, 2026
16	Longevity Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	71 contacts →
	Partial evidence “Longevity Consulting is a customer-focused strategic management and IT consulting firm that helps federal agencies achieve mission objectives, improve outcomes, and strengthen…” Source: RevenueBase Database · checked Sep 23, 2026
17	Strategix Management LLC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	59 contacts →
	Indirect evidence “Founded in 2016 by President and CEO, Jonathan Crawley, Strategix Management LLC employs cutting-edge technology to streamline and ignite program activities that increase the…” Source: RevenueBase Database · checked Sep 23, 2026
18	Collaborative Mind, LLC Cmind	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	11-50	56 contacts →
	Indirect evidence “CMIND assists its clients strategize, leverage and implement practical solutions to maintain their competitive advantage.” Source: RevenueBase Database · checked Sep 23, 2026
19	Ward Circle Strategies	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	52 contacts →
	Indirect evidence “Ward Circle Strategies, Inc.” Source: RevenueBase Database · checked Sep 23, 2026
20	Prosource360 Consulting Services	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	47 contacts →
	Partial evidence “Founded in 2011, ProSource360 is a premier professional, healthcare and technology services consulting firm supporting federal and commercial markets.” Source: RevenueBase Database · checked Sep 23, 2026
21	Cascades Technologies, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	51-200	47 contacts →
	Partial evidence “Cascades Technologies is a Professional Consulting and IT Services firm with a commitment to personal and profession integrity.” Source: RevenueBase Database · checked Sep 23, 2026
22	Capital Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	11-50	43 contacts →
	Partial evidence “Capital Group is a management consulting firm with more than a decade of experience in providing effective and innovative consulting services to public and private sector clients.” Source: RevenueBase Database · checked Sep 23, 2026
23	Trust Consulting Services INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	42 contacts →
	Indirect evidence “We bring an experience unmatched anywhere else, with knowledgeable and thoughtful consultants plus flexible, tailored approaches, all centered on the right outcomes for your…” Source: RevenueBase Database · checked Sep 23, 2026
24	E-Logic, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	11-50	30 contacts →
	Indirect evidence “What we do is help our clients develop and manage cost efficient strategies to implement their projects and reach their goals.” Source: RevenueBase Database · checked Sep 23, 2026
25	Atlas Research	Indirect evidence	Washington, DC, United StatesHQ checked Sep 23, 2026	201-500	30 contacts →
	Indirect evidence “Atlas Research partners with clients to plan and execute enterprise-level transformation and performance improvement initiatives.” Source: RevenueBase Database · checked Sep 23, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: big 5 consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names big 5 consulting firms.
Partial evidence: Its own public description names part of big 5 consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big 5 consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 331 big 5 consulting firms based in Washington, United States

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Big 5 consulting firms based in Washington, United States at a glance

As of Sep 23, 2026

29.3%Verified-email coverage

12.4Average contacts per company

1-10Median size (employees)

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

193

11-50

51-200

201-500

501-1,000

10001+

Email recency for this list is measured across the whole United States list rather than for Washington, so it is reported there. Company counts and contact totals on this page are exact for Washington, over 331 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among big 5 consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Washington, United States whose own description of what they do matches “big 5 consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names big 5 consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among big 5 consulting firms, and records with no verified work email. Companies headquartered outside Washington are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 1,200 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 23, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Big 5 consulting firms by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names big 5 consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many big 5 consulting firms are there based in Washington, United States?

RevenueBase identified 331 big 5 consulting firms headquartered in Washington, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

IBM Promontory, headquartered in Washington, tops this list with the largest team on record.

Which city in the United States has the most big 5 consulting firms?

New York leads the United States with 587 headquartered companies, followed by Chicago (350) and Atlanta (336). Washington has 331.

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,200 verified decision-maker contacts tracked across these 331 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 23, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.