Company lists · Data refreshed September 2026

Top 25 Full service marketing agencies based in the United States

RevenueBase identified 66,124 full service marketing agencies headquartered in the United States as of September 2026 and tracks 547,644 professional contacts across them, including 157,934 with verified work emails and 184,289 with mobile numbers. New York is the largest hub.

This list covers full service marketing agencies 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review
66,124Companies
547,644Contacts tracked
157,934Verified emails
184,289Mobile numbers
Unlock all 66,124 companies Free signup · no credit card · 500 free credits

The 25 largest full service marketing agencies based in the United States

Ranked by team size
Top 25 of 66,124 full service marketing agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names full service marketing agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
QUADPartial evidence
Sussex, WI, United States10001+9,571

“Quad (NYSE: QUAD) is a global marketing experience company that helps brands make direct consumer connections, from household to in-store to online.”

Source: company website · checked Sep 3, 2026
2
Deloitte DigitalIndirect evidence
Denver, CO, United States10001+7,701

“At Deloitte Digital, we connect brands with the right strategies and tools to create great impact.”

Source: company website · checked Sep 3, 2026
3
Omnicom Media GroupIndirect evidence
New York, United States10001+4,016

“Omnicom Media Group (OMG), the media services division of Omnicom Group Inc, delivers transformational experiences for consumers, clients, and talent.”

Source: company website · checked Sep 3, 2026
4
Mccann WorldgroupIndirect evidence
New York, NY, United States10001+3,879

“McCann Worldgroup, part of the Interpublic Group (NYSE: IPG), is the irrefutable leader in the business of creativity.”

Source: company website · checked Sep 3, 2026
5
Digitas North AmericaIndirect evidence
Boston, MA, United States1,001-5,0002,692

“Digitas is the Networked Experience Agency, built on the vision that we create magnetic experiences that earn the right for brands to exist in human networks.”

Source: company website · checked Sep 3, 2026
6
PublicisIndirect evidence
San Francisco, CA, United States1,001-5,0002,551

“You can either adapt to change, ignore it or lead it.”

Source: company website · checked Sep 3, 2026
7
Horizon MediaIndirect evidence
Los Angeles, CA, United States1,001-5,0002,354

“Horizon Media is a leader in driving business-based outcomes for marketers.”

Source: company website · checked Sep 3, 2026
8
Assembly GlobalIndirect evidence
Los Angeles, CA, United States1,001-5,0002,293

“Assembly is a global omnichannel agency built for brands that want a more modern approach to building brands that perform.”

Source: company website · checked Sep 3, 2026
9
Wunderman ThompsonIndirect evidence
New York, NY, United States10001+1,886

“Part creative agency, part consultancy and part technology company, we inspire growth for ambitious brands.”

Source: company website · checked Sep 3, 2026
10
RazorfishIndirect evidence
New York, NY, United States1,001-5,0001,799

“Hi there!”

Source: company website · checked Sep 3, 2026
11
Critical MassIndirect evidence
Chicago, IL, United States1,001-5,0001,723

“We’re Critical Mass.”

Source: company website · checked Sep 3, 2026
12
OmnicomPartial evidence
New York, NY, United States10001+1,702

“Omnicom is the world’s leading marketing and sales company, built for intelligent growth in the next era.”

Source: company website · checked Sep 3, 2026
13
Young & RubicamPartial evidence
New York, NY, United States10001+1,595

“Y&R is a leading global marketing communications company, with more than 189 offices in 90+ countries.”

Source: company website · checked Sep 3, 2026
14
Hearts & ScienceIndirect evidence
New York, NY, United States1,001-5,0001,401

“Hearts & Science, an Omnicom Media Group agency, transforms data signals into meaningful connections between brands and consumers that drive exponential growth.”

Source: company website · checked Sep 3, 2026
15
Tbwa WorldwideIndirect evidence
New York, NY, United States10001+1,249

“TBWA is The Disruption Company®.”

Source: company website · checked Sep 3, 2026
16
CMI Media GroupStrong evidence
Costa Mesa, CA, United States1,001-5,0001,229

“CMI Media Group, a WPP company, is a full-service media agency focused solely on health, wellness, and pharmaceutical marketing.”

Source: company website · checked Sep 3, 2026
17
MccannIndirect evidence
New York, NY, United States10001+1,197

“We build enduring brands that move people and markets through the radical creativity of Truth Well Told™.”

Source: company website · checked Sep 3, 2026
18
FCB Health NEW YorkStrong evidence
New York, NY, United States1,001-5,0001,180

“Part of Omnicom Health, FCB Health New York is a full-service agency with more than 40 years of experience marketing to healthcare professionals, patients and consumers.”

Source: company website · checked Sep 3, 2026
19
Hakuhodo INCIndirect evidence
New York, NY, United States1,001-5,0001,149

“Founded in 1895, Hakuhodo Inc.”

Source: company website · checked Sep 3, 2026
20
BrainlabsIndirect evidence
New York, NY, United States1,001-5,0001,033

“Brainlabs is an independent, AI-native media agency built to grow client revenue and prove the impact of every dollar spent on media.”

Source: company website · checked Sep 3, 2026
21
Area 23Strong evidence
York, United States1,001-5,000954

“AREA 23, part of Omnicom Health, is a full-service agency focused on pushing creativity and invention in healthcare marketing to new heights.”

Source: company website · checked Sep 3, 2026
22Rogers, MN, United States1,001-5,000933

“Archway is the preferred partner in marketing execution for well-known brands.”

Source: company website · checked Sep 3, 2026
23
Finn PartnersIndirect evidence
Denver, CO, United States1,001-5,000897

“1300+ People.”

Source: company website · checked Sep 3, 2026
24
Ruder FinnIndirect evidence
New York, NY, United States1,001-5,000814

“Ruder Finn is one of the world’s largest independent global communications and creative agencies.”

Source: company website · checked Sep 3, 2026
25
EssenceIndirect evidence
Minneapolis, MN, United States1,001-5,000788

“Formerly Essence, we are now EssenceMediacom.”

Source: company website · checked Sep 3, 2026

Showing 25 of 66,124 full service marketing agencies based in the United States

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Full service marketing agencies based in the United States at a glance

As of Sep 3, 2026
1-10Median size (employees)
New YorkLargest hub · 3859 HQs
184,289Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
49,131
11-50
14,185
51-200
2,122
201-500
398
501-1,000
90
1,001-5,000
64
10001+
40

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 full service marketing agencies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “full service marketing agencies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among full service marketing agencies, 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 an evidence 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, 157,934 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 3, 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.

Full service marketing agencies by metro

  • Full service marketing agencies in New York3859
  • Full service marketing agencies in Los Angeles2691
  • Full service marketing agencies in Miami1522
  • Full service marketing agencies in Chicago1364
  • Full service marketing agencies in Atlanta1332
  • Full service marketing agencies in Houston1047
  • Full service marketing agencies in Austin1009

Frequently asked

How many full service marketing agencies are there based in the United States?

RevenueBase identified 66,124 full service marketing agencies 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?

QUAD, headquartered in Sussex, tops this list with the largest team on record.

Which city has the most full service marketing agencies?

New York leads with 3859 headquartered companies, followed by Los Angeles (2691) and Miami (1522).

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 157,934 verified decision-maker contacts tracked across these 66,124 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 3, 2026.

Ready to reach these companies? Verified emails and direct dials for all 66,124 full service marketing agencies based in the United States. Start with a free account, no credit card.

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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 SmartSearch, 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.