Company lists · Data refreshed September 2026

Top 25 Media agencies based in the United States

RevenueBase identified 15,882 media agencies headquartered in the United States as of September 2026 and tracks 353,610 professional contacts across them, including 102,905 with verified work emails and 111,476 with mobile numbers. New York is the largest hub.

This list covers media 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 5, 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 HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
15,882Companies
353,610Contacts tracked
102,905Verified emails
111,476Mobile numbers
Unlock all 15,882 companies Free signup · no credit card · 500 free credits

The 25 largest media agencies based in the United States

Ranked by team size
Top 25 of 15,882 media agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names media 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
OgilvyIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+12,165

“Ogilvy has been creating impact for brands through iconic, culture-changing, value-driving ideas since the company was founded by David Ogilvy 75 years ago.”

Source: company website · checked Sep 5, 2026
2
QUADIndirect evidence
Sussex, WI, United StatesHQ checked Sep 5, 202610001+9,567

“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 5, 2026
3
GroupmIndirect evidence
NY, United StatesHQ checked Sep 5, 202610001+8,120

“We’ve rebranded!”

Source: company website · checked Sep 5, 2026
4
StarcomStrong evidence
Chicago, IL, United StatesHQ checked Sep 5, 20265,001-10,0005,520

“With a history that dates back over 80 years, Starcom is a global communications planning and media leader.”

Source: company website · checked Sep 5, 2026
5
LEO BurnettIndirect evidence
Chicago, IL, United StatesHQ checked Sep 5, 20265,001-10,0005,385

“Leo Burnett is a communications agency powered by its HumanKind operating system, with the belief that creativity, data and technology work together to transform human behavior…”

Source: company website · checked Sep 5, 2026
6
IPG MediabrandsStrong evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+4,963

“IPG Mediabrands is the media and marketing solutions division of Interpublic Group (NYSE: IPG).”

Source: company website · checked Sep 5, 2026
7
The Trade DeskIndirect evidence
Ventura, CA, United StatesHQ checked Sep 5, 20261,001-5,0004,307

“It's more than just clicks.”

Source: company website · checked Sep 5, 2026
8
Omnicom Media GroupStrong evidence
New York, United StatesHQ checked Sep 5, 202610001+3,989

“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 5, 2026
9
Mccann WorldgroupIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+3,874

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

Source: company website · checked Sep 5, 2026
10
SGKIndirect evidence
Des Plaines, IL, United StatesHQ checked Sep 5, 20265,001-10,0003,587

“SGK, part of the Propelis Group, is a global brand and content production agency.”

Source: company website · checked Sep 5, 2026
11
ThompsonIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20265,001-10,0003,574

“J.”

Source: company website · checked Sep 5, 2026
12
InitiativeIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20265,001-10,0002,980

“Initiative unlocks business growth for the world’s most ambitious brands.”

Source: company website · checked Sep 5, 2026
13
Spark FoundryStrong evidence
NY, United StatesHQ checked Sep 5, 20261,001-5,0002,822

“As one of the fastest-growing global media agency networks, Spark Foundry is not beholden to legacy.”

Source: company website · checked Sep 5, 2026
14
Digitas North AmericaIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 20261,001-5,0002,654

“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 5, 2026
15
GREYIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20265,001-10,0002,648

“Grey’s mission is to create Famously Effective ideas that move people, business, and the world forward-harnessing the power of creativity to solve business problems and deliver…”

Source: company website · checked Sep 5, 2026
16
OMDStrong evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+2,639

“OMD is the world’s largest media network, with more than people working across more than 100 countries.”

Source: company website · checked Sep 5, 2026
17
PublicisIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,0002,531

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

Source: company website · checked Sep 5, 2026
18
Clear Channel OutdoorIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,0002,462

“Clear Channel Outdoor Holdings, Inc.(NYSE: CCO) is at the forefront of driving innovation in the out-of-home advertising industry.”

Source: company website · checked Sep 5, 2026
19
Horizon MediaStrong evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,0002,368

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

Source: company website · checked Sep 5, 2026
20
Assembly GlobalIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,0002,313

“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 5, 2026
21
Marketing WerksIndirect evidence
Chicago, IL, United StatesHQ checked Sep 5, 2026n/a2,182

“Marketing Werks has become Product Connections, a fully integrated engagement agency specializing in omnichannel solutions that build relationships between brands and consumers.”

Source: company website · checked Sep 5, 2026
22
UM WorldwideIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 20261,001-5,0001,981

“Our Stand Against Bland approach creates limitless possibilities, making everything we do intelligently driven, diversely courageous, business- and brand-obsessed, and dedicated…”

Source: company website · checked Sep 5, 2026
23
OmnicomIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+1,727

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

Source: company website · checked Sep 5, 2026
24
Wieden KennedyIndirect evidence
Portland, OR, United StatesHQ checked Sep 5, 20261,001-5,0001,711

“Wieden+Kennedy is an independent, global creative company that has built and transformed some of the world’s most well-known, exciting brands for over forty years.”

Source: company website · checked Sep 5, 2026
25
Young & RubicamIndirect evidence
New York, NY, United StatesHQ checked Sep 5, 202610001+1,602

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

Source: company website · checked Sep 5, 2026

Showing 25 of 15,882 media agencies based in the United States

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Media agencies based in the United States at a glance

As of Sep 5, 2026
1-10Median size (employees)
New YorkLargest hub · 1316 HQs
111,476Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
9,748
11-50
4,725
51-200
980
201-500
228
501-1,000
78
1,001-5,000
63
5,001-10,000
17
10001+
34

Verified emails by last verification

0–30
95,985
31–60
6,105
61–90
55
90–180
46
180+
714

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 media 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 “media 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 media 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, 102,905 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 5, 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.

Media agencies by metro

Frequently asked

How many media agencies are there based in the United States?

RevenueBase identified 15,882 media 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?

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

Which city has the most media agencies?

New York leads with 1316 headquartered companies, followed by Los Angeles (761) and Miami (416).

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 102,905 verified decision-maker contacts tracked across these 15,882 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 5, 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 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.