Company lists · Data refreshed September 2026

Top 25 Outsourced sales and marketing agencies based in the United States

Name: Outsourced sales and marketing 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 21, 2026 10,831 companies tracked

RevenueBase identified 10,831 outsourced sales and marketing agencies headquartered in the United States as of September 2026 and tracks 142,858 professional contacts across them, including 27,664 with verified work emails. New York is the largest hub.

This list covers outsourced sales and 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 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 21, 2026 86% judged on-target in blind review

10,831Companies

142,858Contacts tracked

27,664Verified emails

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The 25 largest outsourced sales and marketing agencies based in the United States

Ranked by team size

Top 25 of 10,831 outsourced sales and marketing agencies based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to outsourced sales and marketing 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	Zoominfo	Indirect evidence	Vancouver, WA, United StatesHQ checked Sep 21, 2026	1,001-5,000	4,029 contacts →
	Indirect evidence “ZoomInfo (NASDAQ: GTM) is the go-to-market platform that helps businesses find, acquire and grow their customers.” Source: RevenueBase Database · checked Sep 21, 2026
2	Marketsource INC	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 21, 2026	5,001-10,000	3,063 contacts →
	Partial evidence “MarketSource, an Allegis Group company, is a sales acceleration company focused on delivering better outcomes for many of the world’s most iconic brands.” Source: RevenueBase Database · checked Sep 21, 2026
3	Advanced Call Center Technologies, LLC	Partial evidence	Berwyn, PA, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,774 contacts →
	Partial evidence “Advanced Call Center Technologies, LLC (ACT) is a premier provider of domestic (USA), near shore and far shore outsourced call center services to the financial services, mortgage…” Source: RevenueBase Database · checked Sep 21, 2026
4	KKM	Partial evidence	Woonsocket, RI, United StatesHQ checked Sep 21, 2026	n/a	2,747 contacts →
	Partial evidence “Founded in 1977, KKM is a customer-driven, knowledge and data based sales and service organization.” Source: RevenueBase Database · checked Sep 21, 2026
5	Interpublic Group IPG	Strong evidence	New York, NY, United StatesHQ checked Sep 21, 2026	10001+	2,682 contacts →
	Strong evidence “Interpublic has been acquired by Omnicom, the world's leading marketing and sales company.” Source: RevenueBase Database · checked Sep 21, 2026
6	Marketstar	Strong evidence	Ogden, UT, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,446 contacts →
	Strong evidence “MarketStar is a global B2B sales outsourcing leader with 38+ years of experience driving predictable revenue growth.” Source: RevenueBase Database · checked Sep 21, 2026
7	Power Digital Marketing	Partial evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	501-1,000	1,570 contacts →
	Partial evidence “Power Digital is a growth marketing firm fueled by technology and driven by a talented team of consultative marketers, creatives, analysts and technologists.” Source: RevenueBase Database · checked Sep 21, 2026
8	BDS Connected Solutions, LLC	Partial evidence	Lake Forest, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,530 contacts →
	Partial evidence “BDS Connected Solutions offers a complete suite of solutions that blend Advocacy, Assisted Sales, Training, Virtual, Retail, Experiential, Merchandising, Break Fix, Installations…” Source: RevenueBase Database · checked Sep 21, 2026
9	Tranzact	Partial evidence	Fort Lee, NJ, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,319 contacts →
	Partial evidence “TRANZACT is the market leader in delivering high-volume sales for the top insurance brands in America.” Source: RevenueBase Database · checked Sep 21, 2026
10	Full Potential Solutions	Partial evidence	Waltham, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,238 contacts →
	Partial evidence “Full Potential Solutions (FPS) is a new kind of performance-based outsourcing firm that puts culture and employees first, because we believe that happy, fulfilled teams accomplish…” Source: RevenueBase Database · checked Sep 21, 2026
11	Credico	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	n/a	1,188 contacts →
	Indirect evidence “Credico is the world's leading face-to-face customer acquisition agency, helping our clients attract and retain loyal customers.” Source: RevenueBase Database · checked Sep 21, 2026
12	Demandscience	Indirect evidence	Boston, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,087 contacts →
	Indirect evidence “With proprietary data and omni-channel activation like events, content, programmatic and chat, we cut through the noise to reach entire buyer groups, driving engagement and impact…” Source: RevenueBase Database · checked Sep 21, 2026
13	Cience	Indirect evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	201-500	1,068 contacts →
	Indirect evidence “CIENCE Technologies, Inc, founded in 2015 and headquartered in Denver, CO, is a pioneering global company in lead generation software and services, committed to transforming the…” Source: RevenueBase Database · checked Sep 21, 2026
14	Inktel Contact Center Solutions	Partial evidence	Doral, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	902 contacts →
	Partial evidence “Our Company Inktel is a leading business process outsourcer that specializes in creating personalized call center solutions which enable our clients to increase market share…” Source: RevenueBase Database · checked Sep 21, 2026
15	Memoryblue	Indirect evidence	Tysons, VA, United StatesHQ checked Sep 21, 2026	501-1,000	825 contacts →
	Indirect evidence “memoryBlue is the go-to partner for revenue leaders in B2B Tech looking to grow their pipeline engine.” Source: RevenueBase Database · checked Sep 21, 2026
16	Affinity Group, Sales & Marketing Agency	Partial evidence	Charlotte, WI, United StatesHQ checked Sep 21, 2026	501-1,000	815 contacts →
	Partial evidence “From culinary support, to store-level merchandising, to sales planning and strategy, Affinity Group's experienced retail and foodservice teams can help you build Your Bridge to…” Source: RevenueBase Database · checked Sep 21, 2026
17	S2w Media	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	806 contacts →
	Indirect evidence “We are innovators, problem solvers, thought leaders, and above all else, a team.” Source: RevenueBase Database · checked Sep 21, 2026
18	Manlitics B2B Ites	Partial evidence	New York, United StatesHQ checked Sep 21, 2026	501-1,000	750 contacts →
	Partial evidence “In an ERA of new and emerging digital mediums, we align our core expertise of today’s ever-changing technology with a clear understanding of traditional marketing methods without…” Source: RevenueBase Database · checked Sep 21, 2026
19	Anteriad	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	740 contacts →
	Indirect evidence “Data Driven.” Source: RevenueBase Database · checked Sep 21, 2026
20	Abstrakt Marketing Group	Indirect evidence	St Louis, MO, United StatesHQ checked Sep 21, 2026	501-1,000	724 contacts →
	Indirect evidence “We book the qualified meetings that fill your pipeline for any B2B company ready to grow.” Source: RevenueBase Database · checked Sep 21, 2026
21	Salebuild	Indirect evidence	Redwood City, CA, United StatesHQ checked Sep 21, 2026	n/a	708 contacts →
	Indirect evidence “Salesify, a leading provider of B2B demand generation services, helps our clients create pipeline and accelerate revenue by identifying, profiling, nurturing and connecting with…” Source: RevenueBase Database · checked Sep 21, 2026
22	Flexisales INC	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	201-500	697 contacts →
	Indirect evidence “Flexisales, is a global frontrunner in B2B Lead & Demand Generation and Data Services, serving technology companies & agencies worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
23	SCI	Indirect evidence	Miami, FL, United StatesHQ checked Sep 21, 2026	501-1,000	696 contacts →
	Indirect evidence “SCI was merged and sold to WPP in 2010.” Source: RevenueBase Database · checked Sep 21, 2026
24	Infinity	Partial evidence	Cedar Rapids, IA, United StatesHQ checked Sep 21, 2026	501-1,000	609 contacts →
	Partial evidence “Infinity is an award-winning inside sales agency and consulting firm with 30 years of experience helping B2B companies maximize sales and drive revenue.” Source: RevenueBase Database · checked Sep 21, 2026
25	CMD	Indirect evidence	Portland, OR, United StatesHQ checked Sep 21, 2026	n/a	604 contacts →
	Indirect evidence “Take command of every opportunity with a partner that gets results.” Source: RevenueBase Database · checked Sep 21, 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: outsourced sales and marketing 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 outsourced sales and marketing agencies.
Partial evidence: Its own public description names part of outsourced sales and marketing agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsourced sales and marketing 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 10,831 outsourced sales and marketing agencies based in the United States

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Outsourced sales and marketing agencies based in the United States at a glance

As of Sep 21, 2026

19.4%Verified-email coverage

13.2Average contacts per company

1-10Median size (employees)

4.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

6,217

11-50

3,443

51-200

856

201-500

198

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 10,831 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 outsourced sales and marketing 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 “outsourced sales and marketing 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 outsourced sales and marketing 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 outsourced sales and 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 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, 27,664 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 21, 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.

Outsourced sales and marketing 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 outsourced sales and marketing 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 outsourced sales and marketing agencies are there based in the United States?

RevenueBase identified 10,831 outsourced sales and 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?

Zoominfo, headquartered in Vancouver, tops this list with the largest team on record.

Which city has the most outsourced sales and marketing agencies?

New York leads with 456 headquartered companies, followed by Miami (250) and Los Angeles (245).

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 27,664 verified decision-maker contacts tracked across these 10,831 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 21, 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.