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, its RevenueBase Smart Search rating, 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 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 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. RevenueBase Smart Search rates how each company's information relates to outbound call centers: 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	Advanced Call Center Technologies, LLC	Strong evidence	Berwyn, PA, United StatesHQ checked Sep 5, 2026	5,001-10,000	2,774 contacts →
	Strong 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 5, 2026
2	Infocision Management Corporation	Partial evidence	Akron, OH, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,764 contacts →
	Partial evidence “InfoCision is an award-winning contact center partner trusted by leading brands for over 40 years.” Source: RevenueBase Database · checked Sep 5, 2026
3	Km2 Solutions	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 5, 2026	5,001-10,000	1,741 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
4	Transparent BPO	Partial evidence	Rockville, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	972 contacts →
	Partial evidence “Transparent BPO was founded to provide its clients with superior nearshore contact center services and business process outsourcing at competitive pricing.” Source: RevenueBase Database · checked Sep 5, 2026
5	Inktel Contact Center Solutions	Strong evidence	Doral, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	902 contacts →
	Strong 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 5, 2026
6	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 5, 2026	501-1,000	883 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
7	CBE Companies	Indirect evidence	Cedar Falls, IA, United StatesHQ checked Sep 5, 2026	1,001-5,000	877 contacts →
	Indirect evidence “CBE Companies is the parent organization of CBE Customer Solutions and CBE Group.” Source: RevenueBase Database · checked Sep 5, 2026
8	Global Contact Services GCS	Indirect evidence	Salisbury, NC, United StatesHQ checked Sep 5, 2026	501-1,000	542 contacts →
	Indirect evidence “We are customer service experts.” Source: RevenueBase Database · checked Sep 5, 2026
9	Supportzebra	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	454 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
10	Ansafone Contact Centers	Partial evidence	Santa Ana, CA, United StatesHQ checked Sep 5, 2026	501-1,000	431 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
11	Alliance Pdms	Partial evidence	Hurst, TX, United StatesHQ checked Sep 5, 2026	51-200	428 contacts →
	Partial evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 5, 2026
12	Touchstone Communications	Indirect evidence	Fort Worth, TX, United StatesHQ checked Sep 5, 2026	501-1,000	393 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
13	Beyond Codes INC	Indirect evidence	Simi Valley, CA, United StatesHQ checked Sep 5, 2026	201-500	380 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
14	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	354 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 2026
15	Teledirect Call Centers	Strong evidence	Sacramento, CA, United StatesHQ checked Sep 5, 2026	201-500	307 contacts →
	Strong evidence “TeleDirect provides 24/7 U.S-based call center and answering services for organizations that cannot afford to miss important calls.” Source: RevenueBase Database · checked Sep 5, 2026
16	By Appointment Only, Inc. BAO	Indirect evidence	Chelmsford, MA, United StatesHQ checked Sep 5, 2026	201-500	291 contacts →
	Indirect evidence “The market knows us as the leader in appointment setting.” Source: RevenueBase Database · checked Sep 5, 2026
17	Calltend INC	Indirect evidence	Los Angeles, TX, United StatesHQ checked Sep 5, 2026	51-200	289 contacts →
	Indirect evidence “Current Vertical Focus: Real Estate - Lead Generation, Lead Conversion, Lead Qualification, Agent Recruiting Mortgage - Lead Conversion, Lead Qualification Insurance - Lead…” Source: RevenueBase Database · checked Sep 5, 2026
18	Redial BPO	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 5, 2026	501-1,000	285 contacts →
	Indirect evidence “Redial is a full-service nearshore and offshore business processing outsourcing (BPO) company.” Source: RevenueBase Database · checked Sep 5, 2026
19	Expertcallers	Indirect evidence	Princeton, NJ, United StatesHQ checked Sep 5, 2026	501-1,000	264 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
20	Boomsourcing	Strong evidence	Lehi, UT, United StatesHQ checked Sep 5, 2026	501-1,000	256 contacts →
	Strong evidence “Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: RevenueBase Database · checked Sep 5, 2026
21	Rocket Connections	Partial evidence	Detroit, MI, United StatesHQ checked Sep 5, 2026	1,001-5,000	247 contacts →
	Partial evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: RevenueBase Database · checked Sep 5, 2026
22	Anomaly Squared	Partial evidence	Greensboro, NC, United StatesHQ checked Sep 5, 2026	201-500	216 contacts →
	Partial evidence “Schedule your FREE Consultation here: http://bit.ly/2gUckQb Anomaly Squared is a contact center services provider.” Source: RevenueBase Database · checked Sep 5, 2026
23	Belkins INC	Indirect evidence	Dover, DE, United StatesHQ checked Sep 5, 2026	201-500	209 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
24	Callzilla	Indirect evidence	Miramar, FL, United StatesHQ checked Sep 5, 2026	1,001-5,000	205 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 5, 2026
25	Quantum 3 Media	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 5, 2026	51-200	204 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 5, 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: outbound call centers. 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 outbound call centers.
Partial evidence: Its own public description names part of outbound call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outbound call centers. 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 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

9.0%Verified-email coverage

18.5%Mobile-number coverage

35.5Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · Los Angeles

Sep 5, 2026Page data 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+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

2,8440–30

25031–60

161–90

090–180

48180+

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 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 “outbound call centers”. 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 outbound call centers), 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 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 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, 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.

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 outbound call centers, 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 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 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.