Company lists · Data refreshed September 2026

Top 23 Infrastructure engineering staffing companies based in Washington, United States

Name: Infrastructure engineering staffing companies based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 47 companies tracked

RevenueBase identified 47 infrastructure engineering staffing companies headquartered in Washington, United States as of September 2026 and tracks 1,052 professional contacts across them, including 285 with verified work emails. Across the United States, Houston is the largest hub for this category (320 companies); Washington has 47.

This list covers infrastructure engineering staffing companies 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 28, 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 28, 2026 86% judged on-target in blind review

47Companies

1,052Contacts tracked

285Verified emails

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The 23 largest infrastructure engineering staffing companies based in Washington, United States

Ranked by team size

Top 23 of 47 infrastructure engineering staffing companies based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure engineering staffing companies: 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	The Midtown Group	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	n/a	327 contacts →
	Partial evidence “Founded in 1989, The Midtown Group pioneers 360-degree staffing services and solutions for organizations across both public and private sectors.” Source: RevenueBase Database · checked Sep 28, 2026
2	Axiem International	Partial evidence	Washington, MI, United StatesHQ checked Sep 28, 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 28, 2026
3	Anchor Construction Corporation	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
4	Delon Hampton & Associates, Chartered	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
5	Executive Personnel Group	Partial evidence	Washington, NC, United StatesHQ checked Sep 28, 2026	501-1,000	68 contacts →
	Partial evidence “Executive Personnel Group is a full-service staffing firm dedicated to meeting the needs of the candidates and companies we serve.” Source: RevenueBase Database · checked Sep 28, 2026
6	Cube Root Corporation	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
7	SZ PM Consultants, INC	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	24 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
8	Mindfinders, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	51-200	24 contacts →
	Partial evidence “MindFinders, Inc, a leader in providing mission-critical solutions, has extensive experience in providing high-quality staffing and IT project solutions to the federal government…” Source: RevenueBase Database · checked Sep 28, 2026
9	Bfa, INC	Partial evidence	Washington, MO, United StatesHQ checked Sep 28, 2026	11-50	19 contacts →
	Partial evidence “BFA is a consulting civil engineering firm located in downtown Washington, Missouri.” Source: RevenueBase Database · checked Sep 28, 2026
10	Foxxstem	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	19 contacts →
	Strong 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 28, 2026
11	Interagency INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
12	Harshman CE Group, LLC	Strong evidence	Washington, PA, United StatesHQ checked Sep 28, 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 28, 2026
13	PAN Services DC	Strong evidence	Washington, DC, United StatesHQ checked Sep 28, 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 28, 2026
14	The Josef Group INC	Indirect evidence	Washington, United StatesHQ checked Sep 28, 2026	1-10	9 contacts →
	Indirect evidence “The world is a vastly different place than it used to be.” Source: RevenueBase Database · checked Sep 28, 2026
15	Above ALL Staffing	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “For over fifteen years, Above All Staffing has provided dependable licensed, certified, and skilled employees for environmental and construction projects.” Source: RevenueBase Database · checked Sep 28, 2026
16	Field & Tung Structural Engineers Pllc	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial evidence “Field & Tung Structural Engineers is an engineering team which solves structural challenges for clients.” Source: RevenueBase Database · checked Sep 28, 2026
17	DRM International, INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	7 contacts →
	Partial 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 28, 2026
18	Grotheer & CO	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	5 contacts →
	Partial 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 28, 2026
19	Greening Urban LLC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “Greening Urban is a civil engineering firm with built projects in Washington, D.C; Maryland; and Virginia.” Source: RevenueBase Database · checked Sep 28, 2026
20	PRD	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “Traffic Services * Subsurface Utility Engineering * Land Development * Staff Augmentation” Source: RevenueBase Database · checked Sep 28, 2026
21	Empower Infrastructure	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	2 contacts →
	Partial evidence “EMPOWER INFRASTRUCTURE LLC is registered as CBE, SBE, and DBE for Washington DC, DDOT, Virginia, VDOT, and WMATA.” Source: RevenueBase Database · checked Sep 28, 2026
22	Allied Companies	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	11-50	1 contacts →
	Partial evidence “Professional services firm providing civil and environmental engineering as well as Program Management & Construction Management to government and private clients.” Source: RevenueBase Database · checked Sep 28, 2026
23	Ztigers Consult	Indirect evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	1-10	1 contacts →
	Indirect evidence “Structural Design Depending upon the type of project we ZTigerS utilize Three-dimensional and finite-element modeling for greater accuracy of the structural analysis.” Source: RevenueBase Database · checked Sep 28, 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 engineering staffing companies. 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 engineering staffing companies.
Partial evidence: Its own public description names part of infrastructure engineering staffing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name infrastructure engineering staffing companies. 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 23 of 47 infrastructure engineering staffing companies based in Washington, United States

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Infrastructure engineering staffing companies based in Washington, United States at a glance

As of Sep 28, 2026

27.1%Verified-email coverage

22.4Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 47 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 engineering staffing companies, 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 engineering staffing companies”. 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 engineering staffing companies), 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 engineering staffing companies, 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, 285 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 28, 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 engineering staffing companies 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 engineering staffing companies, 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 engineering staffing companies are there based in Washington, United States?

RevenueBase identified 47 infrastructure engineering staffing companies 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?

The Midtown Group, headquartered in Washington, tops this list with the largest team on record.

Which city in the United States has the most infrastructure engineering staffing companies?

Houston leads the United States with 320 headquartered companies, followed by New York (192) and Austin (129). Washington has 47.

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 285 verified decision-maker contacts tracked across these 47 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 28, 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.