Company lists · Data refreshed September 2026

Top 25 Engineering consultancy firms based in Baton Rouge, United States

Name: Engineering consultancy firms based in Baton Rouge, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 27, 2026 65 companies tracked

RevenueBase identified 65 engineering consultancy firms headquartered in Baton Rouge, United States as of September 2026 and tracks 7,096 professional contacts across them, including 2,180 with verified work emails. Across the United States, Houston is the largest hub for this category (537 companies); Baton Rouge has 65.

This list covers engineering consultancy firms headquartered in Baton Rouge, 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 27, 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 27, 2026 86% judged on-target in blind review

65Companies

7,096Contacts tracked

2,180Verified emails

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The 25 largest engineering consultancy firms based in Baton Rouge, United States

Ranked by team size

Top 25 of 65 engineering consultancy firms based in Baton Rouge, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to engineering consultancy 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	APTIM	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	1,001-5,000	2,639 contacts →
	Indirect evidence “APTIM enhances the quality of the environment, wellbeing of people, resilience of communities, and opportunity for employees to make a difference, not just a living.” Source: RevenueBase Database · checked Sep 27, 2026
2	Providence	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	n/a	2,232 contacts →
	Partial evidence “Providence is an employee-owned engineering and environmental consulting firm.” Source: RevenueBase Database · checked Sep 27, 2026
3	GIS Engineering, LLC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	1,001-5,000	322 contacts →
	Partial evidence “The GIS Industrial Engineering & Construction team offers clients a single point of contact to utilize our 19 strategically located facilities, employees, and 21 service lines.” Source: RevenueBase Database · checked Sep 27, 2026
4	Csrs, A Westwood Company	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	305 contacts →
	Indirect evidence “CSRS was acquired by Westwood Professional Services on June 30, 2025.” Source: RevenueBase Database · checked Sep 27, 2026
5	Stantec Consulting	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	10001+	299 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
6	G.E.C., Inc. GEC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	134 contacts →
	Partial evidence “Established in 1986, GEC is a Louisiana-based engineering firm providing complete and proficient services from planning to implementation for private and public clients.” Source: RevenueBase Database · checked Sep 27, 2026
7	Wink Engineering, LLC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	201-500	122 contacts →
	Partial evidence “Wink Engineering, LLC is a professional consulting firm which provides engineering and design to a diversified clientele, specializing in services to the industrial sector.” Source: RevenueBase Database · checked Sep 27, 2026
8	CK Associates Environmental Consultants	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	101 contacts →
	Indirect evidence “CK Associates is an environmental consulting firm that is fully owned by its employees.” Source: RevenueBase Database · checked Sep 27, 2026
9	Orion Engineers Constructors	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	97 contacts →
	Partial evidence “Orion has the ability to meet your every engineering need from determining the feasibility of your project right through to full EPC, commissioning and startup of industrial…” Source: RevenueBase Database · checked Sep 27, 2026
10	Forte And Tablada, INC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	93 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
11	Group Contractors	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	201-500	70 contacts →
	Indirect evidence “GROUP Contractors is an industrial full-service contractor, headquartered in Baton Rouge, LA.” Source: RevenueBase Database · checked Sep 27, 2026
12	Sems, INC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	61 contacts →
	Indirect evidence “SEMS was established in 1992 and currently has 7 offices in the southeast region of the US, with Baton Rouge, LA serving as our Corporate Headquarters.” Source: RevenueBase Database · checked Sep 27, 2026
13	SJB Group	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	61 contacts →
	Indirect evidence “Founded in 1953, SJB Group has evolved into one of the most respected and diversified firms in its class separating itself from competitors through its personnel, breadth of…” Source: RevenueBase Database · checked Sep 27, 2026
14	Moran Consultants	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	44 contacts →
	Partial evidence “Since its inception in 1968, Moran Consultants has been meeting the needs of lenders, syndicators, and investors on a national scale.” Source: RevenueBase Database · checked Sep 27, 2026
15	Eagle Environmental Services, INC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	42 contacts →
	Indirect evidence “About Us Eagle provides comprehensive environmental consulting services to our clients in the industrial and governmental sectors in the Gulf Coast Region.” Source: RevenueBase Database · checked Sep 27, 2026
16	Gotech, INC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	30 contacts →
	Partial evidence “GOTECH, Inc, a professional engineering and consulting firm, was established in 1981 by Rhaoul A.” Source: RevenueBase Database · checked Sep 27, 2026
17	QRI	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	27 contacts →
	Indirect evidence “Established in 1986, Quaternary Resource Investigations, LLC (QRI) is an Economically Disadvantaged Woman Owned Small Business (EDWOSB) headquartered in Baton Rouge, Louisiana.” Source: RevenueBase Database · checked Sep 27, 2026
18	Professional Engineering Consultants Corporation PEC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	23 contacts →
	Indirect evidence “PEC is a multi-disciplined consulting firm with engineers and other specialists experienced in the following areas, civil, sanitary, transportation, mechanical, recreational…” Source: RevenueBase Database · checked Sep 27, 2026
19	Sigma Consulting Group, Inc. NOW Waggoner	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	22 contacts →
	Indirect evidence “Sigma Consulting Group, Inc.” Source: RevenueBase Database · checked Sep 27, 2026
20	Psdesign	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	22 contacts →
	Indirect evidence “Since 1997, PSDESIGN has grown in size and expanded the breadth of services to better serve customer in a continually evolving industry.” Source: RevenueBase Database · checked Sep 27, 2026
21	Marrero Couvillon & Associates, LLC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	17 contacts →
	Partial evidence “Marrero, Couvillon & Associates, LLC provides consulting engineering and construction services in the Mechanical, Electrical, and Plumbing Disciplines; providing services to…” Source: RevenueBase Database · checked Sep 27, 2026
22	SDR Engineering, INC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	17 contacts →
	Partial evidence “In 2026, the SDR Engineering Team joined WGI.” Source: RevenueBase Database · checked Sep 27, 2026
23	Timbalier Resources, LLC	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	13 contacts →
	Indirect evidence “At Timbalier Resources, we are your strategic partner in large-scale infrastructure projects.” Source: RevenueBase Database · checked Sep 27, 2026
24	Southeast Engineers, LLC	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	11-50	12 contacts →
	Partial evidence “With a combined 70 plus years of experience, Southeast Engineers has become a market leader in a wide range of engineering services.” Source: RevenueBase Database · checked Sep 27, 2026
25	Ppmg Consultants	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	51-200	12 contacts →
	Partial evidence “PPMG is a construction project management consultancy.” Source: RevenueBase Database · checked Sep 27, 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: engineering consultancy 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 engineering consultancy firms.
Partial evidence: Its own public description names part of engineering consultancy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name engineering consultancy 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 65 engineering consultancy firms based in Baton Rouge, United States

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Engineering consultancy firms based in Baton Rouge, United States at a glance

As of Sep 27, 2026

30.7%Verified-email coverage

109.2Average contacts per company

11-50Median size (employees)

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Baton Rouge, so it is reported there. Company counts and contact totals on this page are exact for Baton Rouge, over 65 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 engineering consultancy 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 Baton Rouge, United States whose own description of what they do matches “engineering consultancy 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 engineering consultancy 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 engineering consultancy firms, and records with no verified work email. Companies headquartered outside Baton Rouge 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, 2,180 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 27, 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.

Engineering consultancy 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 engineering consultancy 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 engineering consultancy firms are there based in Baton Rouge, United States?

RevenueBase identified 65 engineering consultancy firms headquartered in Baton Rouge, 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?

APTIM, headquartered in Baton Rouge, tops this list with the largest team on record.

Which city in the United States has the most engineering consultancy firms?

Houston leads the United States with 537 headquartered companies, followed by New York (412) and Chicago (189). Baton Rouge has 65.

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 2,180 verified decision-maker contacts tracked across these 65 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 27, 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.