Company lists · Data verified August 2026

Top 25 Communications consulting firms based in the United States

Name: Communications consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 5,945 companies tracked

There are 5,945 communications consulting firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 56,011 professional contacts across them, including 16,822 with verified work emails and 18,919 with mobile numbers. New York is the largest hub.

This list covers communications consulting 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. Data current as of August 28, 2026.

5,945Companies

56,011Contacts tracked

16,822Verified emails

18,919Mobile numbers

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The 25 largest communications consulting firms based in the United States

Ranked by team size

Top 25 of 5,945 communications consulting firms based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Hill & Knowlton	Austin, TX	1,001-5,000	1,463	366
2	Zeno Group	New York, NY	501-1,000	901	486
3	Porter Novelli	New York, NY	501-1,000	831	211
4	ICR	San Francisco, CA	201-500	684	292
5	Prosek Partners	Boston, MA	201-500	541	452
6	Sunshine Sachs Morgan & Lylis	Los Angeles, CA	201-500	361	231
7	DKC	New York, NY	201-500	346	147
8	Berlinrosen, An Orchestra Company	New York, NY	201-500	307	176
9	Cartesian	Somerset, NJ	201-500	298	164
10	Joele Frank	San Francisco, CA	201-500	250	181
11	Edelman Smithfield	n/a	201-500	241	139
12	Jackson Spalding	Los Angeles, CA	51-200	168	127
13	Orchestra	New York, NY	501-1,000	167	103
14	Rational 360	Washington, DC	51-200	157	94
15	SIA Addison	New York, NY	51-200	154	13
16	Clarity	Los Angeles, CA	51-200	125	80
17	ACTUM	Los Angeles, CA	51-200	123	79
18	Quest Corporation Of America, Inc. Quest	Land O Lakes, FL	51-200	122	81
19	RF Binder	Los Angeles, CA	51-200	122	39
20	Campbell Marketing & Communications	Dearborn, MI	51-200	113	72
21	Vested	New York, NY	51-200	111	70
22	VOX Global	Indianapolis, IN	51-200	100	54
23	Lambert	Grand Rapids, MI	51-200	98	34
24	H Advisors Abernathy	New York, NY	51-200	87	51
25	Blue Streak	Miami, FL	501-1,000	85	54

Showing 25 of 5,945 communications consulting firms based in the United States

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Communications consulting firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 483 HQs

18,919Contacts with mobile numbers

96Emails re-verified in last 30 days

Companies by employee count

1-10

4,808

11-50

963

51-200

130

201-500

501-1,000

1,001-5,000

5,001-10,000

Communications consulting firms by metro

Metro	Companies
Communications consulting firms in New York	483
Communications consulting firms in Washington	348
Communications consulting firms in Los Angeles	206
Communications consulting firms in Chicago	165
Communications consulting firms in Atlanta	126
Communications consulting firms in San Francisco	113
Communications consulting firms in Austin	111
Communications consulting firms in Boston	108

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “communications consulting firms”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 96 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many communications consulting firms are there based in the United States?

There are 5,945 communications consulting firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Hill & Knowlton, headquartered in Austin, tops this list with the largest team on record.

Which city has the most communications consulting firms?

New York leads with 483 headquartered companies, followed by Washington (348) and Los Angeles (206).

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 16,822 verified decision-maker contacts tracked across these 5,945 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.