Company lists · Data refreshed September 2026

Top 25 Outbound calling companies based in the United States

Name: Outbound calling companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 2,184 companies tracked

RevenueBase identified 2,184 outbound calling companies headquartered in the United States as of September 2026 and tracks 44,234 professional contacts across them, including 4,297 with verified work emails and 7,532 with mobile numbers. New York is the largest hub.

This list covers outbound calling companies 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

2,184Companies

44,234Contacts tracked

4,297Verified emails

7,532Mobile numbers

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The 25 largest outbound calling companies based in the United States

Ranked by team size

Top 25 of 2,184 outbound calling companies 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 outbound calling companies: 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
1	Advanced Call Center Technologies, LLCIndirect evidence	Berwyn, PA, United StatesHQ checked Sep 5, 2026	5,001-10,000	2,774
	“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: company website · checked Sep 5, 2026
2	Inktel Contact Center SolutionsIndirect evidence	Doral, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	902
	“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 Sep 5, 2026
3	AnswernetIndirect evidence	Horsham, PA, United StatesHQ checked Sep 5, 2026	501-1,000	883
	“If you are interested in growing your business or increasing efficiency, AnswerNet has the expertise, technology, and people to help you take your company to new heights!” Source: company website · checked Sep 5, 2026
4	SalelyticsIndirect evidence	Appleton, WI, United StatesHQ checked Sep 5, 2026	1,001-5,000	776
	“Salelytics is now MarketSource.” Source: company website · checked Sep 5, 2026
5	Abstrakt Marketing GroupIndirect evidence	St Louis, MO, United StatesHQ checked Sep 5, 2026	501-1,000	724
	“We book the qualified meetings that fill your pipeline for any B2B company ready to grow.” Source: company website · checked Sep 5, 2026
6	SalebuildIndirect evidence	Redwood City, CA, United StatesHQ checked Sep 5, 2026	n/a	708
	“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: company website · checked Sep 5, 2026
7	Flexisales INCIndirect evidence	Las Vegas, NV, United StatesHQ checked Sep 5, 2026	201-500	697
	“Flexisales, is a global frontrunner in B2B Lead & Demand Generation and Data Services, serving technology companies & agencies worldwide.” Source: company website · checked Sep 5, 2026
8	Movingdneedle Pvt. LTDIndirect evidence	Sterling Heights, MI, United StatesHQ checked Sep 5, 2026	51-200	528
	“movingDneedle is a Business to Business Sales Lead Generation Company that provides fast and scalable, sales qualified leads through its unique Personalized Email Marketing…” Source: company website · checked Sep 5, 2026
9	Callbox INCIndirect evidence	Encino, CA, United StatesHQ checked Sep 5, 2026	201-500	499
	“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 Sep 5, 2026
10	DemandshoreIndirect evidence	San Francisco, CA, United StatesHQ checked Sep 5, 2026	501-1,000	478
	“About DemandShore Since 2004, we’ve been working hard to deliver value to Sales & Marketing professionals across B2B Technology companies globally.” Source: company website · checked Sep 5, 2026
11	SaleshiveIndirect evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	51-200	455
	Source: company website · checked Sep 5, 2026
12	Ansafone Contact CentersIndirect evidence	Santa Ana, CA, United StatesHQ checked Sep 5, 2026	501-1,000	431
	“About : Ansafone is the leading outsourced contact center solution provider for companies in the US and Canada and maintains international alliances for global reach.” Source: company website · checked Sep 5, 2026
13	Alliance PdmsIndirect evidence	Hurst, TX, United StatesHQ checked Sep 5, 2026	51-200	428
	“Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: company website · checked Sep 5, 2026
14	Touchstone CommunicationsIndirect evidence	Fort Worth, TX, United StatesHQ checked Sep 5, 2026	501-1,000	393
	“Touchstone Communications was built in 2002 on the philosophy of hiring educated, motivated talent and then providing them with the best training and management to achieve our…” Source: company website · checked Sep 5, 2026
15	AmarketforceIndirect evidence	San Jose, CA, United StatesHQ checked Sep 5, 2026	201-500	391
	“aMarketForce is a full-scale B2B Contact Database & Demand Generation services company.” Source: company website · checked Sep 5, 2026
16	Beyond Codes INCIndirect evidence	Simi Valley, CA, United StatesHQ checked Sep 5, 2026	201-500	380
	“Beyond Codes is a global B2B lead generation and appointment-setting agency trusted by some of the world's leading technology companies to build enterprise sales pipeline.” Source: company website · checked Sep 5, 2026
17	EBQIndirect evidence	Austin, TX, United StatesHQ checked Sep 5, 2026	201-500	377
	“EBQ is an outsourced sales and marketing organization that provides services to help companies scale.” Source: company website · checked Sep 5, 2026
18	The Connection Contact CenterIndirect evidence	Bloomington, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	354
	“For over 35 years, The Connection has made a name for ourselves becoming one of the top industry partners to Fortune 500 companies looking to outsource their contact center…” Source: company website · checked Sep 5, 2026
19	By Appointment Only, Inc. BAOIndirect evidence	Chelmsford, MA, United StatesHQ checked Sep 5, 2026	201-500	291
	“The market knows us as the leader in appointment setting.” Source: company website · checked Sep 5, 2026
20	Calltend INCIndirect evidence	Los Angeles, TX, United StatesHQ checked Sep 5, 2026	51-200	289
	“Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: company website · checked Sep 5, 2026
21	BoomsourcingIndirect evidence	Lehi, UT, United StatesHQ checked Sep 5, 2026	501-1,000	256
	“Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: company website · checked Sep 5, 2026
22	Rocket ConnectionsIndirect evidence	Detroit, MI, United StatesHQ checked Sep 5, 2026	1,001-5,000	247
	“Rocket Connections is a sales and support platform specializing in contact center services.” Source: company website · checked Sep 5, 2026
23	Marketjoy, INCIndirect evidence	Pensacola, FL, United StatesHQ checked Sep 5, 2026	51-200	223
	“Founded in 2016 and headquartered in Pensacola, Florida, MarketJoy is a B2B lead generation, appointment generation and sales development partner built to deliver predictable…” Source: company website · checked Sep 5, 2026
24	Anomaly SquaredIndirect evidence	Greensboro, NC, United StatesHQ checked Sep 5, 2026	201-500	216
	“Schedule your FREE Consultation here: http://bit.ly/2gUckQb Anomaly Squared is a contact center services provider.” Source: company website · checked Sep 5, 2026
25	Belkins INCIndirect evidence	Dover, DE, United StatesHQ checked Sep 5, 2026	201-500	209
	“Belkins is the #1 ranked appointment-setting agency in the USA for 5 years in a row, driving results for businesses in 50+ industries across the globe.” Source: company website · checked Sep 5, 2026

Showing 25 of 2,184 outbound calling companies based in the United States

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Outbound calling companies based in the United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

New YorkLargest hub · 99 HQs

7,532Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

853

11-50

736

51-200

406

201-500

122

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

3,921

31–60

292

61–90

90–180

180+

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 calling companies, 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 “outbound calling companies”. 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 calling companies, 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, 4,297 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.

Outbound calling companies by metro

Outbound calling companies in New York99
Outbound calling companies in Sheridan67
Outbound calling companies in Los Angeles59
Outbound calling companies in Miami51
Outbound calling companies in Austin46
Outbound calling companies in San Francisco42
Outbound calling companies in Houston38
Outbound calling companies in Las Vegas35
Outbound calling companies in Dallas31
Outbound calling companies in Chicago29
Outbound calling companies in San Diego28
Outbound calling companies in Atlanta27

Frequently asked

How many outbound calling companies are there based in the United States?

RevenueBase identified 2,184 outbound calling companies 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?

Advanced Call Center Technologies, LLC, headquartered in Berwyn, tops this list with the largest team on record.

Which city has the most outbound calling companies?

New York leads with 99 headquartered companies, followed by Sheridan (67) and Los Angeles (59).

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 4,297 verified decision-maker contacts tracked across these 2,184 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.