Company lists · Data refreshed September 2026

Top 25 Lead generation call centers worldwide

Name: Lead generation call centers worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 6,729 companies tracked

RevenueBase identified 6,729 lead generation call centers worldwide as of September 2026 and tracks 73,840 professional contacts across them, including 8,412 with verified work emails and 7,749 with mobile numbers. The United States is the largest market and London the largest hub.

This list covers lead generation call centers worldwide, 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 4, 2026. Country and city lists for lead generation call centers follow the table.

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 4, 2026 86% judged on-target in blind review

6,729Companies

73,840Contacts tracked

8,412Verified emails

7,749Mobile numbers

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The 25 largest lead generation call centers worldwide

Ranked by team size

Top 25 of 6,729 lead generation call centers worldwide, ranked by team size, largest first. Data refreshed Sep 4, 2026. RevenueBase Smart Search rates how each company's information relates to lead generation 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, TN, United StatesHQ checked Sep 4, 2026	5,001-10,000	2,779 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 4, 2026
2	Cience	Strong evidence	Miami, FL, United StatesHQ checked Sep 4, 2026	201-500	1,071 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 4, 2026
3	Inktel Contact Center Solutions	Strong evidence	Doral, FL, United StatesHQ checked Sep 4, 2026	1,001-5,000	905 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 4, 2026
4	Answernet	Indirect evidence	Horsham, PA, United StatesHQ checked Sep 4, 2026	501-1,000	892 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 4, 2026
5	S2w Media	Indirect evidence	New York, CA, United StatesHQ checked Sep 4, 2026	501-1,000	798 contacts →
	Indirect evidence “We are innovators, problem solvers, thought leaders, and above all else, a team.” Source: RevenueBase Database · checked Sep 4, 2026
6	Talksure	Indirect evidence	Umhlanga Durban, South AfricaHQ checked Sep 4, 2026	501-1,000	717 contacts →
	Indirect evidence “Established in 2010, Talksure has developed a reputation for being a respected financial services provider and outsource business services partner.” Source: RevenueBase Database · checked Sep 4, 2026
7	Salebuild	Partial evidence	Redwood City, CA, United StatesHQ checked Sep 4, 2026	n/a	708 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 4, 2026
8	Girnar Care	Partial evidence	Jaipur, IndiaHQ checked Sep 4, 2026	501-1,000	649 contacts →
	Partial evidence “We at Girnar Care work towards customer satisfaction and it is also a center of customer excellence.” Source: RevenueBase Database · checked Sep 4, 2026
9	Digitalzone	Partial evidence	New York, United StatesHQ checked Sep 4, 2026	501-1,000	557 contacts →
	Partial evidence “Digitalzone is a global marketing and demand gen company dedicated to delivering compliant leads, exceptional customer satisfaction, and an end-to-end approach.” Source: RevenueBase Database · checked Sep 4, 2026
10	Telenet Marketing Solutions	Indirect evidence	Athens, GA, United StatesHQ checked Sep 4, 2026	201-500	554 contacts →
	Indirect evidence “From initial market awareness to the final stages of a complex B2B buying journey, modern buyers crave authentic interaction.” Source: RevenueBase Database · checked Sep 4, 2026
11	Callbox INC	Strong evidence	Encino, CA, United StatesHQ checked Sep 4, 2026	201-500	501 contacts →
	Strong 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: RevenueBase Database · checked Sep 4, 2026
12	Saleshive	Indirect evidence	Denver, CO, United StatesHQ checked Sep 4, 2026	51-200	455 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 4, 2026
13	Qualifa	Strong evidence	Brighton, United KingdomHQ checked Sep 4, 2026	51-200	440 contacts →
	Strong evidence “We are an award winning multilingual lead generation and market research service provider for B2B publishing, marketing, events and tech companies.” Source: RevenueBase Database · checked Sep 4, 2026
14	Alliance Pdms	Strong evidence	Hurst, TX, United StatesHQ checked Sep 4, 2026	51-200	428 contacts →
	Strong evidence “Alliance is a domestically operated, internationally recognized professional contact center specializing in lead generation and appointment setting.” Source: RevenueBase Database · checked Sep 4, 2026
15	The Lead Market	Partial evidence	Nagpur, IndiaHQ checked Sep 4, 2026	51-200	390 contacts →
	Partial evidence “TLM empowers businesses to generate revenue through their qualified leads.” Source: RevenueBase Database · checked Sep 4, 2026
16	Beyond Codes INC	Indirect evidence	Simi Valley, TX, United StatesHQ checked Sep 4, 2026	201-500	385 contacts →
	Indirect evidence “Founded in 2008, Beyond Codes Inc.” Source: RevenueBase Database · checked Sep 4, 2026
17	The Connection Contact Center	Partial evidence	Bloomington, MN, United StatesHQ checked Sep 4, 2026	1,001-5,000	353 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 4, 2026
18	Teledirect Call Centers	Strong evidence	Sacramento, CA, United StatesHQ checked Sep 4, 2026	201-500	309 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 4, 2026
19	By Appointment Only, Inc. BAO	Indirect evidence	Chelmsford, AZ, United StatesHQ checked Sep 4, 2026	201-500	294 contacts →
	Indirect evidence “The market knows us as the leader in appointment setting.” Source: RevenueBase Database · checked Sep 4, 2026
20	Calltend INC	Strong evidence	Los Angeles, United StatesHQ checked Sep 4, 2026	51-200	288 contacts →
	Strong 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 4, 2026
21	leads.io	Strong evidence	Holland, NetherlandsHQ checked Sep 4, 2026	201-500	254 contacts →
	Strong evidence “Leads.io is the World’s Leading AI-Powered Lead Generation Agency, founded on a performance-based pay-per-lead model.” Source: RevenueBase Database · checked Sep 4, 2026
22	Boomsourcing	Strong evidence	Lehi, UT, United StatesHQ checked Sep 4, 2026	501-1,000	254 contacts →
	Strong evidence “Boomsourcing (A Fusion CX Company) is a call center established in 2007.” Source: RevenueBase Database · checked Sep 4, 2026
23	Rocket Connections	Partial evidence	Detroit, MI, United StatesHQ checked Sep 4, 2026	1,001-5,000	248 contacts →
	Partial evidence “Rocket Connections is a sales and support platform specializing in contact center services.” Source: RevenueBase Database · checked Sep 4, 2026
24	The Telemarketing Company	Indirect evidence	Brighton, United KingdomHQ checked Sep 4, 2026	201-500	242 contacts →
	Indirect evidence “The Telemarketing Company is one of the UK's most trusted telemarketing agencies, delivering flexible, high-quality voice services, including pre and post sales research…” Source: RevenueBase Database · checked Sep 4, 2026
25	Marketjoy, INC	Strong evidence	Pensacola, FL, United StatesHQ checked Sep 4, 2026	51-200	225 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 4, 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: lead generation 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 lead generation call centers.
Partial evidence: Its own public description names part of lead generation call centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name lead generation 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 6,729 lead generation call centers worldwide

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Lead generation call centers worldwide at a glance

As of Sep 4, 2026

11.4%Verified-email coverage

10.5%Mobile-number coverage

11.0Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · London

Sep 4, 2026Page data refreshed

Companies by employee count

1-10

3,428

11-50

2,248

51-200

769

201-500

194

501-1,000

1,001-5,000

5,001-10,000

10001+

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 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.
Coverage: 25 countries, largest first: the United States, India, the United Kingdom, France, Canada, the Netherlands, Australia, Germany, Brazil, Spain and 15 more. Country and city lists for lead generation call centers are linked below.
What qualifies: Companies worldwide 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.
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 lead generation 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 lead generation call centers, and records with no verified work email.
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, 8,412 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 between September 4, 2026 and September 14, 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 location

49 lists · largest first

Every Lead generation call centers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 lead generation 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 lead generation call centers are there worldwide?

RevenueBase identified 6,729 lead generation call centers worldwide 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 country has the most lead generation call centers?

The United States leads with 2,551 companies, followed by India (856) and the United Kingdom (814). Every lead generation call centers list by country and city is linked on this page.

Which city has the most lead generation call centers?

London leads with 252 headquartered companies, followed by Pune (216) and New York (119).

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 8,412 verified decision-maker contacts tracked across these 6,729 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 4, 2026 and September 14, 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.