Company lists · Data refreshed September 2026

Top 25 Architecture firms based in the United States

Name: Architecture firms 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 39,548 companies tracked

RevenueBase identified 39,548 architecture firms headquartered in the United States as of September 2026 and tracks 702,400 professional contacts across them, including 322,616 with verified work emails and 287,120 with mobile numbers. New York is the largest hub.

This list covers architecture firms headquartered in the 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 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

39,548Companies

702,400Contacts tracked

322,616Verified emails

287,120Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest architecture firms based in the United States

Ranked by team size

Top 25 of 39,548 architecture firms 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 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	AECOM	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 6, 2026	10001+	63,914 contacts →
	“AECOM is the global infrastructure leader, committed to delivering a better world.” Source: company website · checked Sep 6, 2026
2	HDR	Strong evidence	Omaha, NE, United StatesHQ checked Sep 6, 2026	10001+	15,269 contacts →
	“HDR is an employee-owned design firm specializing in engineering, architecture, environmental and construction services.” Source: company website · checked Sep 6, 2026
3	Burns & Mcdonnell	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 6, 2026	10001+	12,497 contacts →
	“At Burns & McDonnell, our engineers, construction professionals, architects, planners, technologists and scientists do more than plan, design and construct.” Source: company website · checked Sep 6, 2026
4	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
5	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
6	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
7	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
8	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
9	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
10	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
11	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
12	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
13	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
14	Olsson	Indirect evidence	Lincoln, NE, United StatesHQ checked Sep 6, 2026	1,001-5,000	2,108 contacts →
	“Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Source: company website · checked Sep 6, 2026
15	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
16	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
17	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
18	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
19	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
20	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
21	Layton Construction	Indirect evidence	Sandy, UT, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,826 contacts →
	Source: company website · checked Sep 6, 2026
22	Ryan Companies Us, INC	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,821 contacts →
	“At Ryan Companies, we believe the value of the buildings we design, develop, finance, manage and construct is about more than dollars and cents – it’s also about the value they…” Source: company website · checked Sep 6, 2026
23	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
24	JMT	Indirect evidence	Serving Clients Across The Us, MD, United StatesHQ checked Sep 6, 2026	1,001-5,000	1,688 contacts →
	“Johnson, Mirmiran & Thompson is an employee owned, multi-disciplined firm offering a full array of planning, design, and construction phase consulting services for infrastructure…” Source: company website · checked Sep 6, 2026
25	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

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 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 architecture firms.
Partial evidence: Its own public description names part of architecture firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name architecture 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 39,548 architecture firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 322,616 reachable decision-makers.

Free signup · no credit card

View the full list →

Architecture firms based in the United States at a glance

As of Sep 6, 2026

45.9%Verified-email coverage

40.9%Mobile-number coverage

17.8Average contacts per company

1-10Median size (employees)

6.3%Largest-city concentration · New York

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

25,694

11-50

10,896

51-200

2,246

201-500

387

501-1,000

110

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

299,1500–30

21,12231–60

14461–90

6890–180

2,132180+

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 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 the United States whose own description of what they do matches “architecture 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 architecture 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 architecture firms, 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, 322,616 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 firms by metro

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 architecture 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 architecture firms are there based in the United States?

RevenueBase identified 39,548 architecture firms headquartered in the 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?

AECOM, headquartered in Dallas, tops this list with the largest team on record.

Which city has the most architecture firms?

New York leads with 2473 headquartered companies, followed by Los Angeles (1046) and Chicago (781).

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 322,616 verified decision-maker contacts tracked across these 39,548 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 6, 2026.

Ready to reach these companies? Verified emails and direct dials for all 39,548 architecture firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Architecture firms by geography

Browse the directory

Browse: Companies home · All United States lists · All Architecture firms lists · New lists

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.