Company lists · Data refreshed September 2026

Top 25 Architecture companies based in the United States

Name: Architecture companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 33,363 companies tracked

This directory lists 33,363 architecture companies based in the United States, with 503,041 contacts and 234,877 email addresses. As of September 2026, New York is the single most-represented city among the companies on the list.

Architecture companies design buildings and other structures, develop plans and specifications, and advise clients on construction, renovation, and project delivery. This list covers companies that provide architectural design, planning, documentation, or related building design services. Ranked by team size, largest first. Data current as of September 6, 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 6, 2026 86% judged on-target in blind review

33,363Companies

503,041Contacts tracked

234,877Verified emails

215,234Mobile numbers

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The 25 largest architecture companies based in the United States

Ranked by team size

Top 25 of 33,363 architecture companies based in the United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to architecture 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	Kimley-Horn	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 6, 2026	5,001-10,000	10,117 contacts →
	“Kimley-Horn is one of the nation’s premier planning and design consulting firms.” Source: company website · checked Sep 6, 2026
2	WSP In The U.S	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	10001+	9,318 contacts →
	“What if you could shape built and natural environments – and the future of those that use them?” Source: company website · checked Sep 6, 2026
3	Gensler	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 6, 2026	5,001-10,000	7,900 contacts →
	“Gensler is a global architecture, design, and planning firm with 57 locations across the Americas, Europe, Greater China, Asia Pacific, and the Middle East.” Source: company website · checked Sep 6, 2026
4	Hensel Phelps	Indirect evidence	Greeley, CO, United StatesHQ checked Sep 6, 2026	5,001-10,000	4,094 contacts →
	“As an employee-owned company, Hensel Phelps culture is based on dedication and commitment to delivering EXCELLENCE for our clients and employees.” Source: company website · checked Sep 6, 2026
5	Gilbane Building	Indirect evidence	Providence, RI, United StatesHQ checked Sep 6, 2026	1,001-5,000	4,084 contacts →
	“Gilbane Building Company provides a full slate of construction and facilities-related services-from preconstruction services planning and integrated consulting capabilities to…” Source: company website · checked Sep 6, 2026
6	Perkins&will	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,958 contacts →
	“Since 1935, we’ve believed that design has the power to make the world a better, more beautiful place.” Source: company website · checked Sep 6, 2026
7	BL Harbert International LLC	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 6, 2026	5,001-10,000	2,818 contacts →
	“BL Harbert International, LLC began construction operations in under the leadership of Billy Harbert, Jr, carrying on a family tradition in the construction industry dating back…” Source: company website · checked Sep 6, 2026
8	Dewberry	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,795 contacts →
	“Dewberry is a leading, market-facing firm with a proven history of providing professional services to a wide variety of public- and private-sector clients.” Source: company website · checked Sep 6, 2026
9	HOK	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,614 contacts →
	“HOK is a global interdisciplinary design firm.” Source: company website · checked Sep 6, 2026
10	Hks, INC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,462 contacts →
	“We are a global firm of architects, designers, planners and advisors who create places noted for their beauty and performance.” Source: company website · checked Sep 6, 2026
11	The Haskell Company	Strong evidence	Jacksonville, FL, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,213 contacts →
	“Haskell delivers over $3 billion annually in Architecture, Engineering, Construction (AEC) and Consulting solutions to assure certainty of outcome for complex capital projects…” Source: company website · checked Sep 6, 2026
12	Colliers Engineering & Design	Strong evidence	Holmdel, NJ, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,049 contacts →
	“Colliers Engineering & Design, an affiliate of Colliers, is a trusted provider of multi-discipline engineering and architecture, design and consulting services to public and…” Source: company website · checked Sep 6, 2026
13	DLR Group	Strong evidence	30 Offices, MN, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,992 contacts →
	“DLR Group is an integrated design firm delivering architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse.” Source: company website · checked Sep 6, 2026
14	IMEG	Indirect evidence	Rock Island, IL, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,985 contacts →
	“Leaders in Engineering and Innovation.” Source: company website · checked Sep 6, 2026
15	Skidmore, Owings & Merrill SOM	Indirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,967 contacts →
	“Skidmore, Owings & Merrill (SOM) is a global practice of architects, designers, engineers, and planners, responsible for some of the world’s most technically and environmentally…” Source: company website · checked Sep 6, 2026
16	Rs&h	Strong evidence	Jacksonville, FL, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,942 contacts →
	“With a history of taking the leap from what is to what could be, RS & H is a 100% employee-owned, people-first firm that provides integrated architecture, engineering, and…” Source: company website · checked Sep 6, 2026
17	Smithgroup	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,849 contacts →
	“SmithGroup is an award-winning, multi-national integrated design firm that employs research, data, advanced technologies and design thinking to help clients solve their greatest…” Source: company website · checked Sep 6, 2026
18	Clayco	Strong evidence	Chicago, IL, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,720 contacts →
	“Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the…” Source: company website · checked Sep 6, 2026
19	Cannondesign	Strong evidence	New York, NY, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,660 contacts →
	“CannonDesign is a different kind of design firm, where architecture, strategy, experience, innovation and social good converge to create meaningful impact.” Source: company website · checked Sep 6, 2026
20	Ssoe Group	Strong evidence	Toledo, OH, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,603 contacts →
	“As an internationally ranked architecture and engineering firm, SSOE is known for delivering unparalleled client value that advances the AEC industry.” Source: company website · checked Sep 6, 2026
21	IA Interior Architects	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 6, 2026	501-1,000	1,584 contacts →
	“Celebrating 40 years of visionary design and innovation, IA Interior Architects is the first global architecture firm focused exclusively on interiors.” Source: company website · checked Sep 6, 2026
22	BW Design Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,555 contacts →
	“BW Design Group is the only independent, fully integrated AEC firm powered by a Manufacturer's Mindset™.” Source: company website · checked Sep 6, 2026
23	CRB	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,553 contacts →
	“CRB designs and builds the facilities that help bring life-enhancing therapies, critical medicines, and essential products to people around the world.” Source: company website · checked Sep 6, 2026
24	HGA	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,543 contacts →
	“HGA is a national interdisciplinary design firm committed to making a positive, lasting impact for our clients and communities through research-based, holistic solutions.” Source: company website · checked Sep 6, 2026
25	The American Institute Of Architects AIA	Strong evidence	Washington, DC, United StatesHQ checked Sep 6, 2026	n/a	1,541 contacts →
	“The American Institute of Architects (AIA) is a leading professional membership organization representing members, architecture firms, and 200+ chapters globally.” Source: company website · checked Sep 6, 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: architecture 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 architecture companies.
Partial evidence: Its own public description names part of architecture companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name architecture 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 25 of 33,363 architecture companies based in the United States

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Architecture companies based in the United States at a glance

As of Sep 6, 2026

46.7%Verified-email coverage

42.8%Mobile-number coverage

15.1Average contacts per company

1-10Median size (employees)

6.4%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

21,666

11-50

9,300

51-200

1,826

201-500

299

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

217,8870–30

15,51431–60

9161–90

4790–180

1,338180+

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 architecture 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 the United States whose own description of what they do matches “architecture 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 architecture 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 architecture companies, and records with no verified work email. Companies headquartered outside United States 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, 234,877 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 6, 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.

Architecture companies by metro

Frequently asked

How many architecture companies are based in the United States?

RevenueBase counts 33,363 architecture companies listed based in the United States. The directory also includes 503,041 contacts and 234,877 email addresses.

Which city has the most architecture companies in the list?

New York is the single most-represented city among the architecture companies on the list.

Where can I find contacts at architecture companies?

This directory includes 503,041 contacts and 234,877 email addresses for architecture companies based in the United States.

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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.