Company lists · Data refreshed September 2026

Top 25 Outbound call centers based in the United States

Name: Outbound call centers 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 979 companies tracked

RevenueBase identified 979 outbound call centers headquartered in the United States as of September 2026 and tracks 34,751 professional contacts across them, including 3,143 with verified work emails and 6,420 with mobile numbers. Los Angeles is the largest hub.

This list covers outbound call centers 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

979Companies

34,751Contacts tracked

3,143Verified emails

6,420Mobile numbers

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The 25 largest outbound call centers based in the United States

Ranked by team size

Top 25 of 979 outbound call centers 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 call centers: 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, LLCStrong 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	Infocision Management CorporationPartial evidence	Akron, OH, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,764
	“InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: company website · checked Sep 5, 2026
3	Km2 SolutionsIndirect evidence	Boca Raton, FL, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,741
	“Award-winning outsourcing partner with two decades of experience operating an exclusively nearshore strategy that delivers better performance, close to home, and at a lower cost.” Source: company website · checked Sep 5, 2026
4	Transparent BPOPartial evidence	Rockville, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	972
	“Transparent BPO was founded to provide its clients with superior nearshore contact center services and business process outsourcing at competitive pricing.” Source: company website · checked Sep 5, 2026
5	Inktel Contact Center SolutionsStrong 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
6	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
7	CBE CompaniesIndirect evidence	Cedar Falls, IA, United StatesHQ checked Sep 5, 2026	1,001-5,000	877
	“CBE Companies is the parent organization of CBE Customer Solutions and CBE Group.” Source: company website · checked Sep 5, 2026
8	Global Contact Services GCSIndirect evidence	Salisbury, NC, United StatesHQ checked Sep 5, 2026	501-1,000	542
	“We are customer service experts.” Source: company website · checked Sep 5, 2026
9	SupportzebraIndirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	454
	“SupportZebra is a business process outsourcing company based in the Philippines, with headquarters in the Houston,TX region, that specializes in: Sales & Marketing Retention \|…” Source: company website · checked Sep 5, 2026
10	Ansafone Contact CentersPartial 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
11	Alliance PdmsPartial 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
12	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
13	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
14	The Connection Contact CenterPartial 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
15	Teledirect Call CentersStrong evidence	Sacramento, CA, United StatesHQ checked Sep 5, 2026	201-500	307
	“TeleDirect provides 24/7 U.S-based call center and answering services for organizations that cannot afford to miss important calls.” Source: company website · checked Sep 5, 2026
16	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
17	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
18	Redial BPOIndirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	501-1,000	285
	“Redial is a full-service nearshore and offshore business processing outsourcing (BPO) company.” Source: company website · checked Sep 5, 2026
19	ExpertcallersIndirect evidence	Princeton, NJ, United StatesHQ checked Sep 5, 2026	501-1,000	264
	“ExpertCallers (a division of Flatworld Solutions) is a global consulting and outsourcing company, with a wealth of experience in providing operational and strategic excellence to…” Source: company website · checked Sep 5, 2026
20	BoomsourcingStrong 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
21	Rocket ConnectionsPartial 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
22	Anomaly SquaredPartial 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
23	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
24	CallzillaIndirect evidence	Miramar, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	205
	“Callzilla is a Customer Experience Management practice, that blends cutting edge AI with twenty one years of CX management mastery that are faster, smarter, and unmistakably human.” Source: company website · checked Sep 5, 2026
25	Quantum 3 MediaPartial evidence	Charlotte, NC, United StatesHQ checked Sep 5, 2026	51-200	204
	“Quantum 3 Media is one of the fastest growing organizations within the customer acquisition, lead generation/Pay per call within all verticals of insurance and education, contact…” Source: company website · checked Sep 5, 2026

Showing 25 of 979 outbound call centers based in the United States

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Outbound call centers based in the United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

Los AngelesLargest hub · 29 HQs

6,420Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

224

11-50

316

51-200

262

201-500

103

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

2,844

31–60

250

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 call centers, 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 call centers”. 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 call centers, 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, 3,143 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 call centers by metro

Outbound call centers in Los Angeles29
Outbound call centers in Miami26

Frequently asked

How many outbound call centers are there based in the United States?

RevenueBase identified 979 outbound call centers 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 call centers?

Los Angeles leads with 29 headquartered companies, followed by Miami (26) and Houston (24).

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 3,143 verified decision-maker contacts tracked across these 979 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.