Company lists · Data refreshed September 2026

Top 25 Infrastructure design firms based in Los Angeles, United States

Name: Infrastructure design firms based in Los Angeles, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 62 companies tracked

RevenueBase identified 62 infrastructure design firms headquartered in Los Angeles, United States as of September 2026 and tracks 2,308 professional contacts across them, including 1,132 with verified work emails. Houston is the largest hub.

This list covers infrastructure design firms headquartered in Los Angeles, 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

62Companies

2,308Contacts tracked

1,132Verified emails

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The 25 largest infrastructure design firms based in Los Angeles, United States

Ranked by team size

Top 25 of 62 infrastructure design firms based in Los Angeles, 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	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	501-1,000	748 contacts →
	Indirect evidence “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Source: RevenueBase Database · checked Sep 20, 2026
2	Cordoba Corporation	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	501-1,000	516 contacts →
	Indirect evidence “CORDOBA CORPORATION is a California engineering, construction management, program management, and planning firm specializing in transportation, water, energy, education and…” Source: RevenueBase Database · checked Sep 20, 2026
3	John A. Martin & Associates, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	132 contacts →
	Indirect evidence “Established in 1953, John A.” Source: RevenueBase Database · checked Sep 20, 2026
4	Gruen Associates	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	73 contacts →
	Indirect evidence “Since 1946, Gruen Associates succeeds as one of Los Angeles’ best known legacy firms with a deep portfolio of landmark projects.” Source: RevenueBase Database · checked Sep 20, 2026
5	Brandow & Johnston	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	53 contacts →
	Indirect evidence “Our firm is proud to be identified among those who built the Los Angeles we see today.” Source: RevenueBase Database · checked Sep 20, 2026
6	SEA PAC Engineering, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	51 contacts →
	Indirect evidence “SEA PAC ENGINEERING, INC is a company based out of Los Angeles, California, United States.” Source: RevenueBase Database · checked Sep 20, 2026
7	JGM	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	47 contacts →
	Partial evidence “JGM has offered a comprehensive array of design and construction related services to public and private sector clients for over 40 years.” Source: RevenueBase Database · checked Sep 20, 2026
8	Englekirk Structural Engineers Englekirk Institutional	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	43 contacts →
	Indirect evidence “Englekirk fields two structural engineering firms specifically tailored to meet the challenges of the commercial and institutional market sectors.” Source: RevenueBase Database · checked Sep 20, 2026
9	Aecom Technology Corp	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	43 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
10	V&a, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
11	Nous Engineering	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Nous Engineering is an innovative Structural Engineering firm based in Los Angeles.” Source: RevenueBase Database · checked Sep 20, 2026
12	The Alliance Group Consulting	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	1-10	16 contacts →
	Indirect evidence “The Alliance Group Consulting (TAGC) is a California based transportation engineering firm which is located in Los Angeles and is certified as a SBE/VSBE/DBE/MBE/DGS firm.” Source: RevenueBase Database · checked Sep 20, 2026
13	BA INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	15 contacts →
	Partial evidence “BA Inc.(DBE/MBE/SBE) has been in business for 11 years; established and incorporated in 2004 to provide professional engineering design services to public agencies for public…” Source: RevenueBase Database · checked Sep 20, 2026
14	C2pm	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	14 contacts →
	Indirect evidence “C2PM stands at the forefront of the construction consulting landscape, offering a full spectrum of program management, construction management, and specialized engineering…” Source: RevenueBase Database · checked Sep 20, 2026
15	Innodez	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	13 contacts →
	Partial evidence “We are a design and engineering company with a passionate group of engineers that offers professional engineering design services for a range of clients in commercial and…” Source: RevenueBase Database · checked Sep 20, 2026
16	D R Consultants & Designers, INC	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “DRC, a public works engineering firm, in business for 40 years, provides expert level Transportation; Water/Wastewater engineering and Construction Management services to repeat…” Source: RevenueBase Database · checked Sep 20, 2026
17	The Robert Group	Indirect evidence	Los Angeles, United StatesHQ checked Sep 20, 2026	1-10	10 contacts →
	Indirect evidence “The Robert Group, based in Los Angeles and with a smaller but highly respected presence in San Francisco, is an established public affairs and strategic communications firm…” Source: RevenueBase Database · checked Sep 20, 2026
18	DK Engineer, Corp	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	1-10	9 contacts →
	Partial evidence “DK Engineer, Corp (DKE) is a boutique civil engineering consulting firm that provides design and construction administration services for construction projects throughout Southern…” Source: RevenueBase Database · checked Sep 20, 2026
19	Peter T. Erdelyi & Assoc. Inc.	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “Whether you're upgrading an existing structure or building from the ground up, Peter T.” Source: RevenueBase Database · checked Sep 20, 2026
20	Legion Contractors, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	51-200	9 contacts →
	Partial evidence “As a trusted General Contractor specializing in Infrastructural Public Works, we partner with government agencies to deliver projects that connect communities, enhance safety, and…” Source: RevenueBase Database · checked Sep 20, 2026
21	Parthenon Corporation	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	8 contacts →
	Indirect evidence “Parthenon Corporation is a leading provider of consulting, engineering, and construction services worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
22	Archimorphic	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	1-10	8 contacts →
	Indirect evidence “Archimorphic is a boutique architectural firm located in Downtown Los Angeles.” Source: RevenueBase Database · checked Sep 20, 2026
23	Roto Architects	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	7 contacts →
	Partial evidence “RoTo has envisioned, designed, and built a wide range of project types of varying type, scope, and complexity, locally, nationally, and internationally.” Source: RevenueBase Database · checked Sep 20, 2026
24	Steiner Consulting INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	1-10	5 contacts →
	Partial evidence “Steiner Consulting, Inc.(SCI) is a heavy civil-engineering consulting firm specializing in driving Southern California infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026
25	Suenram & Associates, INC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 20, 2026	11-50	4 contacts →
	Partial evidence “Suenram & Associates, Inc.(SAI) is a Los Angeles-based certified small business enterprise providing civil engineering design and consulting services for public agencies and…” 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 62 infrastructure design firms based in Los Angeles, United States

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Infrastructure design firms based in Los Angeles, United States at a glance

As of Sep 20, 2026

49.0%Verified-email coverage

37.2Average contacts per company

1-10Median size (employees)

251.6%Largest-city concentration · Houston

Sep 20, 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 Los Angeles, so it is reported there. Company counts and contact totals on this page are exact for Los Angeles, over 62 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 Los Angeles, 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 Los Angeles 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, 1,132 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 Los Angeles, United States?

RevenueBase identified 62 infrastructure design firms headquartered in Los Angeles, 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?

Psomas, headquartered in Los Angeles, 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 1,132 verified decision-maker contacts tracked across these 62 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.