Company lists · Data refreshed August 2026

Top 25 Outbound marketing agencies based in the United States

Name: Outbound 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 Aug 29, 2026 16,818 companies tracked

There are 16,818 outbound marketing agencies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 136,622 professional contacts across them, including 37,512 with verified work emails and 44,045 with mobile numbers. New York is the largest hub.

This list covers outbound 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 August 29, 2026.

16,818Companies

136,622Contacts tracked

37,512Verified emails

44,045Mobile numbers

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The 25 largest outbound marketing agencies based in the United States

Ranked by team size

Top 25 of 16,818 outbound marketing agencies based in the United States, ranked by team size, largest first. Data refreshed Aug 29, 2026. Evidence rates how directly each company's own description names outbound 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.
#	Company	Headquarters	Employees	Contacts	Verified emails
1	Horizon MediaIndirect evidence “Horizon Media is a leader in driving business-based outcomes for marketers.” Source: company website · checked Aug 29, 2026	Los Angeles, CA, United States	1,001-5,000	2,354	1,588
2	CenterfieldIndirect evidence “Super-powered customer acquisition.” Source: company website · checked Aug 29, 2026	Los Angeles, CA, United States	1,001-5,000	1,057	349
3	Inktel Contact Center SolutionsIndirect 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: company website · checked Aug 29, 2026	Doral, FL, United States	1,001-5,000	905	113
4	Logical PositionIndirect evidence “Logical Position (LP) is an Inc.” Source: company website · checked Aug 29, 2026	Lake Oswego, OR, United States	501-1,000	899	674
5	AnteriadIndirect evidence “Data Driven.” Source: company website · checked Aug 29, 2026	New York, NY, United States	501-1,000	737	348
6	Abstrakt Marketing GroupPartial evidence “Abstrakt Marketing Group helps businesses grow with bold strategies that deliver results.” Source: company website · checked Aug 29, 2026	St Louis, MO, United States	501-1,000	724	235
7	SCIIndirect evidence “SCI was merged and sold to WPP in 2010.” Source: company website · checked Aug 29, 2026	Miami, FL, United States	501-1,000	693	6
8	Telenet Marketing SolutionsIndirect evidence “From initial market awareness to the final stages of a complex B2B buying journey, modern buyers crave authentic interaction.” Source: company website · checked Aug 29, 2026	Athens, GA, United States	201-500	554	40
9	Callbox INCIndirect evidence “Callbox is the #1 trusted lead generation services and AI-Powered Growth Strategy Partner by enterprise and scaling businesses in the USA, Canada, Asia Pacific, Latin America…” Source: company website · checked Aug 29, 2026	Encino, CA, United States	201-500	501	2
10	AmsivePartial evidence “Amsive is a data-driven performance marketing agency that enhances marketing ROI through innovative customer acquisition and engagement solutions.” Source: company website · checked Aug 29, 2026	Greenville, SC, United States	501-1,000	497	298
11	Sg360Indirect evidence “sg360° can help you identify and connect with your best prospects 1:1, both offline and on.” Source: company website · checked Aug 29, 2026	Wheeling, IL, United States	501-1,000	473	175
12	Ebrandz LLPIndirect evidence “Within a short span, eBrandz has seen enormous growth.” Source: company website · checked Aug 29, 2026	New York, NY, United States	201-500	427	115
13	5wprPartial evidence “5WPR is one of the largest independently owned PR and digital marketing agencies in the US.” Source: company website · checked Aug 29, 2026	New York, NY, United States	201-500	392	153
14	LocaledgeIndirect evidence “LocalEdge, a Hearst Media Services Company, offers a full suite of online advertising products and services for any size business and budget across the country.” Source: company website · checked Aug 29, 2026	Buffalo, NY, United States	501-1,000	386	43
15	EBQPartial evidence “EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: company website · checked Aug 29, 2026	Austin, TX, United States	201-500	379	105
16	Money MailerPartial evidence “Money Mailer is recognized as a leader in the direct marketing industry, delivering local deals to neighborhoods since 1979.” Source: company website · checked Aug 29, 2026	Cypress, CA, United States	201-500	377	66
17	Reprise DigitalIndirect evidence “We are now KINESSO.” Source: company website · checked Aug 29, 2026	Los Angeles, CA, United States	1,001-5,000	371	28
18	FUNNLIndirect evidence “FunnL was built on a revolutionary idea: B2B companies don’t need more leads-they need more qualified sales meetings with decision-makers.” Source: company website · checked Aug 29, 2026	Philadelphia, United States	201-500	351	1
19	Coalition TechnologiesIndirect evidence “Coalition Technologies is one of the leading SEO & web design agencies in the United States.” Source: company website · checked Aug 29, 2026	Los Angeles, CA, United States	201-500	320	116
20	TargetbasePartial evidence “Targetbase is a precision marketing agency obsessed with performance-our clients’ and our own.” Source: company website · checked Aug 29, 2026	Raleigh, NC, United States	201-500	317	125
21	Unboundb2bPartial evidence “UnboundB2B is a marketing agency that caters to Enterprise and Technology companies across the globe to improve ROI on their marketing spend and shorten sales cycle with its…” Source: company website · checked Aug 29, 2026	San Jose, CA, United States	201-500	295	131
22	Drive Social MediaIndirect evidence “Drive Social Media takes a holistic approach to designing strategies for our clients.” Source: company website · checked Aug 29, 2026	Atlanta, GA, United States	201-500	279	1
23	BoomsourcingIndirect evidence “Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: company website · checked Aug 29, 2026	Lehi, UT, United States	501-1,000	254	13
24	Rocket ConnectionsIndirect evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: company website · checked Aug 29, 2026	Detroit, MI, United States	1,001-5,000	248	21
25	Hawke MediaPartial evidence “Hawke Media is a full-service marketing agency and your Outsourced CMO®, helping brands drive measurable growth through strategy, paid media, creative, PR, SEO, social media…” Source: company website · checked Aug 29, 2026	Santa Monica, CA, United States	201-500	236	131

Showing 25 of 16,818 outbound marketing agencies based in the United States

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Outbound marketing agencies based in the United States at a glance

As of Aug 29, 2026

1-10Median size (employees)

New YorkLargest hub · 696 HQs

44,045Contacts with mobile numbers

Aug 29, 2026Data refreshed

Companies by employee count

1-10

11,287

11-50

4,427

51-200

836

201-500

182

501-1,000

1,001-5,000

10001+

Outbound marketing agencies by metro

Metro	Companies
Outbound marketing agencies in New York	696
Outbound marketing agencies in Los Angeles	466
Outbound marketing agencies in Miami	354
Outbound marketing agencies in Chicago	283
Outbound marketing agencies in Houston	281
Outbound marketing agencies in Austin	280
Outbound marketing agencies in Atlanta	269

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 outbound 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: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “outbound 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 outbound 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.
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, 37,512 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 August 29, 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.

Frequently asked

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

There are 16,818 outbound marketing agencies headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Horizon Media, headquartered in Los Angeles, tops this list with the largest team on record.

Which city has the most outbound marketing agencies?

New York leads with 696 headquartered companies, followed by Los Angeles (466) and Miami (354).

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 37,512 verified decision-maker contacts tracked across these 16,818 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 29, 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.