Company lists · Data refreshed September 2026

Top 25 Customer engagement agencies based in the United States

Name: Customer engagement agencies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 7,794 companies tracked

RevenueBase identified 7,794 customer engagement agencies headquartered in the United States as of September 2026 and tracks 265,010 professional contacts across them, including 70,751 with verified work emails. New York is the largest hub.

This list covers customer engagement 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 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 19, 2026 86% judged on-target in blind review

7,794Companies

265,010Contacts tracked

70,751Verified emails

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The 25 largest customer engagement agencies based in the United States

Ranked by team size

Top 25 of 7,794 customer engagement agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to customer engagement agencies: 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	IQOR	Partial evidence	Fort Lauderdale, FL, United StatesHQ checked Sep 19, 2026	10001+	17,310 contacts →
	Partial evidence “iQor is a trusted partner in customer experience solutions for global brands and a portfolio company of Mill Point Capital.” Source: RevenueBase Database · checked Sep 19, 2026
2	IBEX	Strong evidence	Washington, DC, United StatesHQ checked Sep 19, 2026	10001+	15,457 contacts →
	Strong evidence “ibex delivers innovative business process outsourcing (BPO), smart digital marketing, online acquisition technology, and end-to-end customer engagement solutions to help companies…” Source: RevenueBase Database · checked Sep 19, 2026
3	VML	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	10001+	15,338 contacts →
	Indirect evidence “VML is a global powerhouse born from the unification of Wunderman Thompson and VMLY & R, two of the world's most powerful and accomplished creative agencies with complementary…” Source: RevenueBase Database · checked Sep 19, 2026
4	Acosta	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 19, 2026	10001+	11,521 contacts →
	Indirect evidence “Acosta brings simplicity to retail sales.” Source: RevenueBase Database · checked Sep 19, 2026
5	QUAD	Indirect evidence	Sussex, WI, United StatesHQ checked Sep 19, 2026	10001+	9,567 contacts →
	Indirect evidence “Quad (NYSE: QUAD) is a global marketing experience company that helps brands make direct consumer connections, from household to in-store to online.” Source: RevenueBase Database · checked Sep 19, 2026
6	Fusion CX	Partial evidence	Norcross, GA, United StatesHQ checked Sep 19, 2026	10001+	4,785 contacts →
	Partial evidence “At Fusion CX, we revolutionize customer experience by blending innovative technology and human connection.” Source: RevenueBase Database · checked Sep 19, 2026
7	Merkle	Indirect evidence	Columbia, MD, United StatesHQ checked Sep 19, 2026	10001+	4,731 contacts →
	Indirect evidence “Merkle, a dentsu company, powers the experience economy.” Source: RevenueBase Database · checked Sep 19, 2026
8	Harte Hanks	Partial evidence	Chelmsford, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,901 contacts →
	Partial evidence “We are The Customer Company®, a global leader in Customer Experience (CX), Omnichannel Marketing, Data Services, Customer Care, Fulfillment, and Logistics.” Source: RevenueBase Database · checked Sep 19, 2026
9	Klaviyo	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,789 contacts →
	Indirect evidence “Klaviyo (NYSE: KVYO) is the autonomous B2C CRM.” Source: RevenueBase Database · checked Sep 19, 2026
10	Digitas North America	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,654 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 19, 2026
11	MRM	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,627 contacts →
	Indirect evidence “MRM is a modern relationship marketing agency that builds enduring brand relationships.” Source: RevenueBase Database · checked Sep 19, 2026
12	2020 Companies	Indirect evidence	Southlake, TX, United StatesHQ checked Sep 19, 2026	10001+	2,463 contacts →
	Indirect evidence “2020 Companies is an award-winning retail sales, merchandising, and experiential marketing agency headquartered in Southlake, TX.” Source: RevenueBase Database · checked Sep 19, 2026
13	Assembly Global	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,313 contacts →
	Indirect evidence “Assembly is a global omnichannel agency built for brands that want a more modern approach to building brands that perform.” Source: RevenueBase Database · checked Sep 19, 2026
14	DDB	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	5,001-10,000	2,190 contacts →
	Indirect evidence “The birthplace of the creative revolution, DDB is built on the belief that emotional advantage creates business advantage.” Source: RevenueBase Database · checked Sep 19, 2026
15	Marketing Werks	Partial evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	n/a	2,182 contacts →
	Partial evidence “Marketing Werks has become Product Connections, a fully integrated engagement agency specializing in omnichannel solutions that build relationships between brands and consumers.” Source: RevenueBase Database · checked Sep 19, 2026
16	BRAZE	Strong evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,142 contacts →
	Strong evidence “Braze is the leading customer engagement platform that empowers brands to Be Absolutely Engaging.™ Braze allows any marketer to collect and take action on any amount of data from…” Source: RevenueBase Database · checked Sep 19, 2026
17	BI Worldwide	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,905 contacts →
	Partial evidence “BI WORLDWIDE is a global engagement agency that uses the principles of behavioral economics to produce measurable business results by designing and delivering solutions that…” Source: RevenueBase Database · checked Sep 19, 2026
18	Op360 Officepartners360	Partial evidence	Ridgefield, CT, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,777 contacts →
	Partial evidence “OP360, part of iQor CXBPO™, is a trusted partner in intelligent customer experience solutions for global brands.” Source: RevenueBase Database · checked Sep 19, 2026
19	Razorfish	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,763 contacts →
	Indirect evidence “Hi there!” Source: RevenueBase Database · checked Sep 19, 2026
20	Support Services Group	Strong evidence	Waco, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	1,710 contacts →
	Strong evidence “Support Services Group (SSG) helps businesses accelerate growth and earn customers for life through high-touch, outsourced engagement center services.” Source: RevenueBase Database · checked Sep 19, 2026
21	TMS	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,688 contacts →
	Indirect evidence “tms unites technology and marketing and sourcing to drive transformational change for the world’s leading brands.” Source: RevenueBase Database · checked Sep 19, 2026
22	MKTG	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,502 contacts →
	Indirect evidence “For over 20 years MKTG S+E has led some of the most transformative sponsorships in sports & entertainment.” Source: RevenueBase Database · checked Sep 19, 2026
23	GMR Marketing	Indirect evidence	New Berlin, WI, United StatesHQ checked Sep 19, 2026	501-1,000	1,497 contacts →
	Indirect evidence “We are the Experience Agency making unforgettable stories born of humanity.” Source: RevenueBase Database · checked Sep 19, 2026
24	Hearts & Science	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,359 contacts →
	Indirect evidence “Hearts & Science, an Omnicom Media Group agency, transforms data signals into meaningful connections between brands and consumers that drive exponential growth.” Source: RevenueBase Database · checked Sep 19, 2026
25	Birdeye	Indirect evidence	Palo Alto, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,343 contacts →
	Indirect evidence “Birdeye is the #1 Agentic Marketing Platform for Multi-location Brands, purpose-built for multi-location brands.” Source: RevenueBase Database · checked Sep 19, 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: customer engagement agencies. 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 customer engagement agencies.
Partial evidence: Its own public description names part of customer engagement agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer engagement agencies. 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 7,794 customer engagement agencies based in the United States

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Customer engagement agencies based in the United States at a glance

As of Sep 19, 2026

26.7%Verified-email coverage

34.0Average contacts per company

1-10Median size (employees)

7.9%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

4,445

11-50

2,468

51-200

560

201-500

159

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 7,794 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 customer engagement agencies, 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 “customer engagement agencies”. 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 customer engagement agencies), 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 customer engagement 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 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, 70,751 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 19, 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.

Customer engagement agencies by metro

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 customer engagement agencies, 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 customer engagement agencies are there based in the United States?

RevenueBase identified 7,794 customer engagement 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?

IQOR, headquartered in Fort Lauderdale, tops this list with the largest team on record.

Which city has the most customer engagement agencies?

New York leads with 615 headquartered companies, followed by Los Angeles (346) and Miami (197).

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 70,751 verified decision-maker contacts tracked across these 7,794 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 19, 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.