Company lists · Data refreshed September 2026

Top 25 Lead generation call centers based in the United States

Name: Lead generation 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 4, 2026 2,551 companies tracked

RevenueBase identified 2,551 lead generation call centers headquartered in the United States as of September 2026 and tracks 37,967 professional contacts across them, including 4,042 with verified work emails and 6,820 with mobile numbers. New York is the largest hub.

This list covers lead generation 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 4, 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 4, 2026 86% judged on-target in blind review

2,551Companies

37,967Contacts tracked

4,042Verified emails

6,820Mobile numbers

Unlock all 2,551 companies Free signup · no credit card · 500 free credits

The 25 largest lead generation call centers based in the United States

Ranked by team size

Top 25 of 2,551 lead generation call centers based in the United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names lead generation 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, TN, United StatesHQ checked Sep 4, 2026	5,001-10,000	2,779
	“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 4, 2026
2	CienceStrong evidence	Miami, FL, United StatesHQ checked Sep 4, 2026	201-500	1,071
	“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: company website · checked Sep 4, 2026
3	Inktel Contact Center SolutionsStrong evidence	Doral, FL, United StatesHQ checked Sep 4, 2026	1,001-5,000	905
	“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 4, 2026
4	AnswernetIndirect evidence	Horsham, PA, United StatesHQ checked Sep 4, 2026	501-1,000	892
	“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 4, 2026
5	S2w MediaIndirect evidence	New York, CA, United StatesHQ checked Sep 4, 2026	501-1,000	798
	“We are innovators, problem solvers, thought leaders, and above all else, a team.” Source: company website · checked Sep 4, 2026
6	SalebuildPartial evidence	Redwood City, CA, United StatesHQ checked Sep 4, 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 4, 2026
7	Telenet Marketing SolutionsIndirect evidence	Athens, GA, United StatesHQ checked Sep 4, 2026	201-500	554
	“From initial market awareness to the final stages of a complex B2B buying journey, modern buyers crave authentic interaction.” Source: company website · checked Sep 4, 2026
8	Callbox INCStrong evidence	Encino, CA, United StatesHQ checked Sep 4, 2026	201-500	501
	“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 4, 2026
9	SaleshiveIndirect evidence	Denver, CO, United StatesHQ checked Sep 4, 2026	51-200	455
	Source: company website · checked Sep 4, 2026
10	Alliance PdmsStrong evidence	Hurst, TX, United StatesHQ checked Sep 4, 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 4, 2026
11	Beyond Codes INCIndirect evidence	Simi Valley, TX, United StatesHQ checked Sep 4, 2026	201-500	385
	“Founded in 2008, Beyond Codes Inc.” Source: company website · checked Sep 4, 2026
12	The Connection Contact CenterPartial evidence	Bloomington, MN, United StatesHQ checked Sep 4, 2026	1,001-5,000	353
	“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 4, 2026
13	Teledirect Call CentersStrong evidence	Sacramento, CA, United StatesHQ checked Sep 4, 2026	201-500	309
	“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 4, 2026
14	By Appointment Only, Inc. BAOIndirect evidence	Chelmsford, AZ, United StatesHQ checked Sep 4, 2026	201-500	294
	“The market knows us as the leader in appointment setting.” Source: company website · checked Sep 4, 2026
15	Calltend INCStrong evidence	Los Angeles, United StatesHQ checked Sep 4, 2026	51-200	288
	“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 4, 2026
16	BoomsourcingStrong evidence	Lehi, UT, United StatesHQ checked Sep 4, 2026	501-1,000	254
	“Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: company website · checked Sep 4, 2026
17	Rocket ConnectionsPartial evidence	Detroit, MI, United StatesHQ checked Sep 4, 2026	1,001-5,000	248
	“Rocket Connections is a sales and support platform specializing in contact center services.” Source: company website · checked Sep 4, 2026
18	Marketjoy, INCStrong evidence	Pensacola, FL, United StatesHQ checked Sep 4, 2026	51-200	225
	“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 4, 2026
19	SqueezeIndirect evidence	Orem, UT, United StatesHQ checked Sep 4, 2026	501-1,000	217
	“Squeeze (GoSqueeze.com) is the leader in Sales Experience (SX).” Source: company website · checked Sep 4, 2026
20	Anomaly SquaredPartial evidence	Greensboro, NC, United StatesHQ checked Sep 4, 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 4, 2026
21	Belkins INCIndirect evidence	Dover, DE, United StatesHQ checked Sep 4, 2026	201-500	207
	“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 4, 2026
22	Quantum 3 MediaStrong evidence	Charlotte, NC, United StatesHQ checked Sep 4, 2026	51-200	203
	“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 4, 2026
23	Dynamic BDCPartial evidence	Troy, MI, United StatesHQ checked Sep 4, 2026	501-1,000	190
	“Dynamic Marketing Services was created to cost effectively address the needs of Dealers who want to professionally handle their internet leads as well as their outbound sales and…” Source: company website · checked Sep 4, 2026
24	Concept ServicesStrong evidence	Copley, OH, United StatesHQ checked Sep 4, 2026	51-200	186
	“Concept develops and implements comprehensive B2B lead generation and sales development solutions for companies.” Source: company website · checked Sep 4, 2026
25	Grupo NOA InternationalStrong evidence	Miami, United StatesHQ checked Sep 4, 2026	51-200	186
	“Grupo Noa International is a premier virtual call center for the international direct response industry.” Source: company website · checked Sep 4, 2026

Showing 25 of 2,551 lead generation call centers based in the United States

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Lead generation call centers based in the United States at a glance

As of Sep 4, 2026

11-50Median size (employees)

New YorkLargest hub · 119 HQs

6,820Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

1,191

11-50

866

51-200

342

201-500

106

501-1,000

1,001-5,000

5,001-10,000

Verified emails by last verification

0–30

31–60

373

61–90

1,951

90–180

1,641

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 lead generation 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 “lead generation 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 lead generation 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, 4,042 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 4, 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.

Lead generation call centers by metro

Lead generation call centers in New York119
Lead generation call centers in Sheridan81
Lead generation call centers in Los Angeles78
Lead generation call centers in Miami65
Lead generation call centers in San Francisco54
Lead generation call centers in San Diego51
Lead generation call centers in Austin48
Lead generation call centers in Houston42
Lead generation call centers in Las Vegas39
Lead generation call centers in Chicago35
Lead generation call centers in Dallas34
Lead generation call centers in Orlando33
Lead generation call centers in Atlanta28
Lead generation call centers in Denver27
Lead generation call centers in Wilmington27
Lead generation call centers in Tampa26

Frequently asked

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

RevenueBase identified 2,551 lead generation 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 Johnson City, tops this list with the largest team on record.

Which city has the most lead generation call centers?

New York leads with 119 headquartered companies, followed by Sheridan (81) and Los Angeles (78).

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 4,042 verified decision-maker contacts tracked across these 2,551 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 4, 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.