Company lists · Data refreshed September 2026

Top 25 Infrastructure design firms based in Washington, United States

Name: Infrastructure design 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 20, 2026 52 companies tracked

RevenueBase identified 52 infrastructure design firms headquartered in Washington, United States as of September 2026 and tracks 2,515 professional contacts across them, including 843 with verified work emails. Houston is the largest hub.

This list covers infrastructure design 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 20, 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 20, 2026 86% judged on-target in blind review

52Companies

2,515Contacts tracked

843Verified emails

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The 25 largest infrastructure design firms based in Washington, United States

Ranked by team size

Top 25 of 52 infrastructure design firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure design 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	PAGE	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,191 contacts →
	Partial evidence “Performance by Design.” Source: RevenueBase Database · checked Sep 20, 2026
2	Synergy Consulting, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	434 contacts →
	Indirect evidence “Synergy Consulting is Global Leader in Financial and Corporate Advisory.” Source: RevenueBase Database · checked Sep 20, 2026
3	Mckissack & Mckissack	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	175 contacts →
	Indirect 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 20, 2026
4	Shalom Baranes Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	84 contacts →
	Indirect evidence “Shalom Baranes Associates (SBA) is a Washington, DC architectural firm with an acclaimed reputation for its expertise in residential, commercial, institutional, and governmental…” Source: RevenueBase Database · checked Sep 20, 2026
5	Anchor Construction Corporation	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	201-500	77 contacts →
	Partial evidence “Anchor Construction Corporation is one of the Mid-Atlantic Region’s most respected and leading self-performing utility and infrastructure firms, delivering superior solutions for…” Source: RevenueBase Database · checked Sep 20, 2026
6	Delon Hampton & Associates, Chartered	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	72 contacts →
	Indirect 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 20, 2026
7	Hayat Brown LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
8	Cube Root Corporation	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	34 contacts →
	Partial 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 20, 2026
9	Wiles Mensch	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	29 contacts →
	Partial evidence “Wiles Mensch (WM) is a certified small business providing land development and design services for projects across all sectors worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
10	Prime Partners Engineering	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial 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 20, 2026
11	SZ PM Consultants, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	24 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
12	Alphatec PC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	22 contacts →
	Partial 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 20, 2026
13	Bfa, INC	Indirect evidence	Washington, MO, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “BFA is a consulting civil engineering firm located in downtown Washington, Missouri.” Source: RevenueBase Database · checked Sep 20, 2026
14	Foxxstem	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 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 20, 2026
15	Interagency INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Partial evidence “InterAgency provides preconstruction consulting for the Washington Metro Area’s most complex and challenging infrastructure projects.” Source: RevenueBase Database · checked Sep 20, 2026
16	Harshman CE Group, LLC	Strong evidence	Washington, PA, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Strong 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 20, 2026
17	KGP Design Studio, LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Partial evidence “KGP design studio is a diverse, international and multidisciplinary design firm with expertise in architecture, urban design and transit.” Source: RevenueBase Database · checked Sep 20, 2026
18	PAN Services DC	Strong evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	17 contacts →
	Strong evidence “Pan Services is an International Full-Service Infrastructure Development and Management Advisory services firm offering Design, Engineering, Construction, Consulting and…” Source: RevenueBase Database · checked Sep 20, 2026
19	Bradley Site Design, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “Located in Washington, DC, Bradley Site Design is a dynamic Landscape Architecture, Civil Engineering and Planning firm founded in 1994 and dedicated to the creation of socially…” Source: RevenueBase Database · checked Sep 20, 2026
20	CG LA Infrastructure	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	15 contacts →
	Partial evidence “CG/LA is the authority on infrastructure strategy and project development.” Source: RevenueBase Database · checked Sep 20, 2026
21	LEE And Associates, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	12 contacts →
	Partial evidence “lee and associates, inc (lai) is a respected and highly responsive firm offering planning and design professional services as it relates to how man relates to the land and the…” Source: RevenueBase Database · checked Sep 20, 2026
22	Rebel North America	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	51-200	12 contacts →
	Indirect evidence “As one of the leading U.S.” Source: RevenueBase Database · checked Sep 20, 2026
23	DRM International, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	7 contacts →
	Indirect evidence “DRM International, Inc,(DRM) is a leading DIsadvantaged Business Enterprise (DBE) professional engineering consulting firm offering engineering, architectural, planning…” Source: RevenueBase Database · checked Sep 20, 2026
24	Symmetra Design	Partial evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “SYMMETRA DESIGN is a transportation planning and traffic engineering consulting firm that specializes in urban environments.” Source: RevenueBase Database · checked Sep 20, 2026
25	Grotheer & CO	Indirect evidence	Washington, DC, United StatesHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “GROTHEER & CO, a small business located in Washington, DC, has been practicing professional engineering since 1954, and has completed thousands of projects for local and federal…” Source: RevenueBase Database · checked Sep 20, 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: infrastructure design 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 infrastructure design firms.
Partial evidence: Its own public description names part of infrastructure design firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name infrastructure design 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 52 infrastructure design firms based in Washington, United States

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Infrastructure design firms based in Washington, United States at a glance

As of Sep 20, 2026

33.5%Verified-email coverage

48.4Average contacts per company

11-50Median size (employees)

300.0%Largest-city concentration · Houston

Sep 20, 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 52 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 infrastructure design 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 “infrastructure design 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 infrastructure design 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 infrastructure design 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, 843 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 20, 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.

Infrastructure design 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 infrastructure design 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 infrastructure design firms are there based in Washington, United States?

RevenueBase identified 52 infrastructure design 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?

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

Which city has the most infrastructure design firms?

Houston leads with 156 headquartered companies, followed by New York (141) and Chicago (89).

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 843 verified decision-maker contacts tracked across these 52 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 20, 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.