Company lists · Data refreshed September 2026

Top 25 Engineering consultancy firms based in Washington, United States

Name: Engineering consultancy 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 27, 2026 105 companies tracked

RevenueBase identified 105 engineering consultancy firms headquartered in Washington, United States as of September 2026 and tracks 3,016 professional contacts across them, including 831 with verified work emails. Across the United States, Houston is the largest hub for this category (537 companies); Washington has 105.

This list covers engineering consultancy 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 27, 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 27, 2026 86% judged on-target in blind review

105Companies

3,016Contacts tracked

831Verified emails

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The 25 largest engineering consultancy firms based in Washington, United States

Ranked by team size

Top 25 of 105 engineering consultancy firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to engineering consultancy 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	Synergy Consulting, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	434 contacts →
	Indirect evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 27, 2026
2	RTKL	Strong evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	1,001-5,000	351 contacts →
	Strong evidence “CRTKL has now joined Arcadis, a global leader in the delivery of sustainable design, engineering and consultancy solutions for natural and built assets.” Source: RevenueBase Database · checked Sep 27, 2026
3	Setty & Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	220 contacts →
	Indirect evidence “Established in 1984, SETTY is headquartered in Fairfax, VA, with offices in Atlanta, GA, Baltimore, MD, Charlottesville, VA, Fairfax, VA, Los Angeles, CA, New York, NY…” Source: RevenueBase Database · checked Sep 27, 2026
4	Mckissack & Mckissack	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	175 contacts →
	Partial evidence “McKissack & McKissack is a national architectural, engineering, program and construction management firm with 30 years of experience working with clients to envision and deliver…” Source: RevenueBase Database · checked Sep 27, 2026
5	Axiem International	Partial evidence	Washington, MI, United StatesHQ checked Sep 27, 2026	201-500	141 contacts →
	Partial evidence “For more than 18 years, Axiem International has provided the highest quality Engineering deliverables and professionals to the Energy, Aerospace, Automotive & Industrial…” Source: RevenueBase Database · checked Sep 27, 2026
6	Veracity Engineering	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	80 contacts →
	Partial 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 27, 2026
7	Delon Hampton & Associates, Chartered	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	72 contacts →
	Partial evidence “Delon Hampton & Associates, Chartered (DHA), is a professional consulting engineering firm specializing in civil and structural engineering, as well as program and construction…” Source: RevenueBase Database · checked Sep 27, 2026
8	Peer Consultants, P.C	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	71 contacts →
	Indirect evidence “In 1978, PEER was established under Dr.” Source: RevenueBase Database · checked Sep 27, 2026
9	Bitarchitects	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	60 contacts →
	Partial evidence “Architecture, Engineering & Construction” Source: RevenueBase Database · checked Sep 27, 2026
10	B360 Bizsolutions 360 INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	201-500	58 contacts →
	Indirect evidence “BizSolutions 360 Inc.” Source: RevenueBase Database · checked Sep 27, 2026
11	Hayat Brown LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	50 contacts →
	Partial evidence “Comprised of experienced, savvy professionals, Hayat Brown provides services in engineering and P3, real estate and infrastructure advisory.” Source: RevenueBase Database · checked Sep 27, 2026
12	Global Engineering Solutions	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	44 contacts →
	Partial evidence “Global Engineering Solutions is an Engineering, Program Management and Construction Management firm specializing in Mechanical, Electrical, Plumbing and Fire Protection…” Source: RevenueBase Database · checked Sep 27, 2026
13	Cube Root Corporation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	34 contacts →
	Indirect evidence “Cube Root Corporation is a professional services firm offering a range of services including design, program management, construction management, facilities management, and other…” Source: RevenueBase Database · checked Sep 27, 2026
14	FMC & Associates LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	32 contacts →
	Partial evidence “FMC & ASSOCIATES LLC is a civil engineering company based out of Washington, DC and provides specialty engineering consulting services, construction material testing and…” Source: RevenueBase Database · checked Sep 27, 2026
15	Soil And Land USE Technology	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	30 contacts →
	Indirect evidence “SaLUT is a client-focused company.” Source: RevenueBase Database · checked Sep 27, 2026
16	Prime Partners Engineering	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	27 contacts →
	Indirect evidence “We strive to be an industry leader by offering clients superior expertise, cutting-edge solutions and forward-thinking design in all their projects-from the most basic to the most…” Source: RevenueBase Database · checked Sep 27, 2026
17	Amar Group, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	1-10	27 contacts →
	Partial evidence “AMAR Group, LLC is a full service architecture, civil engineering, facility assessement and Certified Third Party Inspection Company.” Source: RevenueBase Database · checked Sep 27, 2026
18	SZ PM Consultants, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	24 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
19	North Arrow, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “DUNS Number: 08-001-8268 CAGE Code: 7GN69 SBA Certified Small Business District of Columbia Certified Business Enterprise (CBE) Metropolitan Washington Airports Authority Local…” Source: RevenueBase Database · checked Sep 27, 2026
20	Alphatec PC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “Alphatec PC is a full service A/E firm located in Dupont Circle and has been providing design and consulting services for over 50 years.” Source: RevenueBase Database · checked Sep 27, 2026
21	Bfa, INC	Partial evidence	Washington, MO, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “BFA is a consulting civil engineering firm located in downtown Washington, Missouri.” Source: RevenueBase Database · checked Sep 27, 2026
22	Foxxstem	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “FOXXSTEM is a professional engineering consulting firm that inspires and creates infrastructure that connects people to communities and communities to opportunities for better…” Source: RevenueBase Database · checked Sep 27, 2026
23	Interagency INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Indirect evidence “InterAgency provides preconstruction consulting for the Washington Metro Area’s most complex and challenging infrastructure projects.” Source: RevenueBase Database · checked Sep 27, 2026
24	Harshman CE Group, LLC	Partial evidence	Washington, PA, United StatesHQ checked Sep 27, 2026	11-50	19 contacts →
	Partial evidence “We are a full service Professional Engineering consulting firm providing civil site and infrastructure design, professional land surveying, facility design, and permitting support…” Source: RevenueBase Database · checked Sep 27, 2026
25	Waller Corporation	Indirect evidence	Washington, PA, United StatesHQ checked Sep 27, 2026	11-50	17 contacts →
	Indirect evidence “Louis E.” Source: RevenueBase Database · checked Sep 27, 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: engineering consultancy 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 engineering consultancy firms.
Partial evidence: Its own public description names part of engineering consultancy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engineering consultancy 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 105 engineering consultancy firms based in Washington, United States

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Engineering consultancy firms based in Washington, United States at a glance

As of Sep 27, 2026

27.6%Verified-email coverage

28.7Average contacts per company

11-50Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 105 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 engineering consultancy 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 “engineering consultancy 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 engineering consultancy 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 engineering consultancy 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, 831 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 27, 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.

Engineering consultancy 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 engineering consultancy 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 engineering consultancy firms are there based in Washington, United States?

RevenueBase identified 105 engineering consultancy 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?

Synergy Consulting, INC, headquartered in Washington, tops this list with the largest team on record.

Which city in the United States has the most engineering consultancy firms?

Houston leads the United States with 537 headquartered companies, followed by New York (412) and Chicago (189). Washington has 105.

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 831 verified decision-maker contacts tracked across these 105 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 27, 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.