Company lists · Data refreshed September 2026

Top 25 Internal communications firms based in the United States

Name: Internal communications 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 20, 2026 4,394 companies tracked

RevenueBase identified 4,394 internal communications firms headquartered in the United States as of September 2026 and tracks 54,721 professional contacts across them, including 21,418 with verified work emails. New York is the largest hub.

This list covers internal communications 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 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

4,394Companies

54,721Contacts tracked

21,418Verified emails

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The 25 largest internal communications firms based in the United States

Ranked by team size

Top 25 of 4,394 internal communications firms based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to internal communications 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	Edelman	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	5,001-10,000	6,242 contacts →
	Partial evidence “Edelman is a global communications firm that partners with businesses and organizations to evolve, promote and protect their brands and reputations.” Source: RevenueBase Database · checked Sep 20, 2026
2	Burson	Partial evidence	New York, United StatesHQ checked Sep 20, 2026	5,001-10,000	3,541 contacts →
	Partial evidence “Burson is the global leader in communications, purpose-built to create value for our clients through reputation.” Source: RevenueBase Database · checked Sep 20, 2026
3	Hill & Knowlton	Indirect evidence	NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,450 contacts →
	Indirect evidence “Hill & Knowlton is a strategic and creative partner to drive breakthrough opportunities for growth and value creation, advance corporate strategy, and build reputation capital and…” Source: RevenueBase Database · checked Sep 20, 2026
4	Finn Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	903 contacts →
	Indirect evidence “1300+ People.” Source: RevenueBase Database · checked Sep 20, 2026
5	Zeno Group	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	501-1,000	887 contacts →
	Partial evidence “Zeno Group is the fiercely independent and global, integrated communications agency, born from PR.” Source: RevenueBase Database · checked Sep 20, 2026
6	Porter Novelli	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	501-1,000	821 contacts →
	Partial evidence “Porter Novelli is the strategic communications company, fueled by innovation, empowering clients to do business better in an ever-changing world.” Source: RevenueBase Database · checked Sep 20, 2026
7	Ruder Finn	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	815 contacts →
	Partial evidence “Ruder Finn is one of the world’s largest global independent integrated marketing and communications agencies, leading at the intersection of technology, human creativity, and…” Source: RevenueBase Database · checked Sep 20, 2026
8	ICR	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	693 contacts →
	Partial evidence “ICR is a strategic communications and advisory firm that helps management teams align how they communicate with how markets think.” Source: RevenueBase Database · checked Sep 20, 2026
9	Prosek Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	543 contacts →
	Indirect evidence “Prosek Partners builds – and protects – the top brands in business.” Source: RevenueBase Database · checked Sep 20, 2026
10	BCW Global	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	449 contacts →
	Partial evidence “BCW is the global communications agency built to move people.” Source: RevenueBase Database · checked Sep 20, 2026
11	Workshop	Strong evidence	Omaha, NE, United StatesHQ checked Sep 20, 2026	51-200	447 contacts →
	Strong evidence “Workshop is a modern, purpose-built internal communications platform that helps teams create, send, manage, and measure employee communications in one place, starting with email…” Source: RevenueBase Database · checked Sep 20, 2026
12	Sunshine Sachs Morgan & Lylis	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	364 contacts →
	Partial evidence “Sunshine Sachs Morgan & Lylis is an independent, full-service firm specializing in communications and narrative strategy.” Source: RevenueBase Database · checked Sep 20, 2026
13	DKC	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	349 contacts →
	Indirect evidence “DKC is a full service public relations, marketing and government affairs firm and part of the Acceleration Community of Companies, Based in New York City, and with offices in Los…” Source: RevenueBase Database · checked Sep 20, 2026
14	Jeffreygroup	Partial evidence	Miami, FL, United StatesHQ checked Sep 20, 2026	201-500	329 contacts →
	Partial evidence “Founded in 1993, JeffreyGroup is the leading marketing, corporate communications and public affairs consultancy focused exclusively on Latin America.” Source: RevenueBase Database · checked Sep 20, 2026
15	Nail Communications	Indirect evidence	Providence, RI, United StatesHQ checked Sep 20, 2026	n/a	315 contacts →
	Indirect evidence “Nail Where every brand finds its fascinating.” Source: RevenueBase Database · checked Sep 20, 2026
16	Berlinrosen, An Orchestra Company	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	302 contacts →
	Partial evidence “Built to operate with the speed and intensity of a political campaign, BerlinRosen takes a 360-degree approach to communications, activating audiences and elevating story above…” Source: RevenueBase Database · checked Sep 20, 2026
17	Reingold, INC	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 20, 2026	201-500	282 contacts →
	Partial evidence “Reingold is a full-service strategic communications and marketing firm, helping clients tell stories that get results.” Source: RevenueBase Database · checked Sep 20, 2026
18	Joele Frank	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	201-500	243 contacts →
	Partial evidence “Joele Frank is a strategic communications firm that enables clients to take control in key moments of challenge and opportunity, from bet-the-company situations to the ongoing…” Source: RevenueBase Database · checked Sep 20, 2026
19	G&s Business Communications, A G&s Agency	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	227 contacts →
	Partial evidence “G&S Business Communications is an independent B2B and B2B2C communications agency with over 55 years of experience helping organizations navigate complexity and build momentum.” Source: RevenueBase Database · checked Sep 20, 2026
20	Stratcomm, INC	Partial evidence	Framingham, MA, United StatesHQ checked Sep 20, 2026	51-200	225 contacts →
	Partial evidence “People always ask, what does strategic communications mean?” Source: RevenueBase Database · checked Sep 20, 2026
21	TVS Communication Solutions	Partial evidence	Detroit, MI, United StatesHQ checked Sep 20, 2026	n/a	221 contacts →
	Partial evidence “Centrally located in Metro Detroit, TVS Communication Solutions is the perfect full service communications agency providing companies and individuals the means to communicate…” Source: RevenueBase Database · checked Sep 20, 2026
22	Text100 NOW Archetype	Indirect evidence	New York, United StatesHQ checked Sep 20, 2026	501-1,000	207 contacts →
	Indirect evidence “Text100 & Bite are now Archetype.” Source: RevenueBase Database · checked Sep 20, 2026
23	Devries Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	206 contacts →
	Indirect evidence “DeVries Global is a boutique agency with a global view that lives at the intersection of life and style.” Source: RevenueBase Database · checked Sep 20, 2026
24	Cohn & Wolfe	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	200 contacts →
	Partial evidence “Cohn & Wolfe, a global communications agency, builds brands and corporate reputations through an uncompromising commitment to creativity.” Source: RevenueBase Database · checked Sep 20, 2026
25	Mixing Board, Powered By Axios	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 20, 2026	n/a	197 contacts →
	Indirect evidence “Mixing Board is a community of top professionals who share insights, support each other, and seek to elevate the industry at large.” 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: internal communications 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 internal communications firms.
Partial evidence: Its own public description names part of internal communications firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name internal communications 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 4,394 internal communications firms based in the United States

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Internal communications firms based in the United States at a glance

As of Sep 20, 2026

39.1%Verified-email coverage

12.5Average contacts per company

1-10Median size (employees)

9.0%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

3,319

11-50

896

51-200

128

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,394 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 internal communications 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 “internal communications 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 internal communications 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 internal communications 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, 21,418 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.

Internal communications firms by metro

Internal communications firms in New York395
Internal communications firms in Washington170
Internal communications firms in Chicago147
Internal communications firms in Los Angeles125
Internal communications firms in San Francisco94
Internal communications firms in Boston79
Internal communications firms in Atlanta78
Internal communications firms in Miami68
Internal communications firms in Denver65
Internal communications firms in Austin59
Internal communications firms in Dallas58
Internal communications firms in Houston53
Internal communications firms in Minneapolis50
Internal communications firms in Portland49
Internal communications firms in Seattle47
Internal communications firms in Philadelphia41
Internal communications firms in San Diego35
Internal communications firms in Alexandria31
Internal communications firms in Columbus29
Internal communications firms in Baltimore28
Internal communications firms in Nashville28
Internal communications firms in Phoenix28
Internal communications firms in Milwaukee27
Internal communications firms in New York City27
Internal communications firms in Pittsburgh26
Internal communications firms in Raleigh25

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 internal communications 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 internal communications firms are there based in the United States?

RevenueBase identified 4,394 internal communications 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?

Edelman, headquartered in New York, tops this list with the largest team on record.

Which city has the most internal communications firms?

New York leads with 395 headquartered companies, followed by Washington (170) and Chicago (147).

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 21,418 verified decision-maker contacts tracked across these 4,394 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.