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Company lists · Data verified August 2026

Top 25 Call center service providers based in the United States

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 911 companies tracked

There are 911 call center service providers headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 54,777 professional contacts across them, including 4,792 with verified work emails and 10,612 with mobile numbers. Houston is the largest hub.

This list covers call center service providers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

911Companies
54,777Contacts tracked
4,792Verified emails
10,612Mobile numbers
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The 25 largest call center service providers based in the United States

Ranked by team size
Top 25 of 911 call center service providers based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#CompanyHQEmployeesContactsVerified emails
1Startek IndiaDenver, CO10001+4,405347
2TelvistaDallas, TX1,001-5,0003,12539
3CAT Technologies ArgentinaMiami, FL1,001-5,0002,211323
4Infocision Management CorporationAkron, OH1,001-5,0001,773146
5SupportninjaAustin, TX1,001-5,0001,695547
6DialamericaMahwah, NJ1,001-5,0001,53750
7RDI CorporationCincinnati, OH1,001-5,0001,51238
8Senture, LLCLondon1,001-5,0001,477198
9Valor GlobalScottsdale, AZ1,001-5,0001,04472
10Inktel Contact Center SolutionsDoral, FL1,001-5,000905113
11AnswernetHorsham, PA501-1,000892148
12Focus ServicesRoy, UT1,001-5,00079363
13Sequential Technology InternationalBethlehem1,001-5,00076243
14Iqor IndiaSt Petersburg, FL10001+64994
15TelenetworkSan Marcos, TX1,001-5,00056746
16Global Contact Services GCSYuma, AZ501-1,0005429
17Contactus CommunicationsColumbus, OH1,001-5,00051335
18Activus ConnectOrlando, FL501-1,00048071
19OnesupportSan Marcos, TX1,001-5,000478114
20SupportzebraHouston, TX1,001-5,00045299
21Ansafone Contact CentersOcala, FL501-1,00042970
22CentrisLongview, TX1,001-5,00036525
23The Connection Contact CenterBurnsville, MN1,001-5,0003536
24ExpertcallersPrinceton, NJ501-1,0002659
25BoomsourcingLehi, UT501-1,00025413

Showing 25 of 911 call center service providers based in the United States

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Call center service providers based in the United States at a glance

As of Aug 28, 2026
11-50Median size (employees)
HoustonLargest hub · 21 HQs
10,612Contacts with mobile numbers
19Emails re-verified in last 30 days

Companies by employee count

1-10
178
11-50
288
51-200
235
201-500
103
501-1,000
44
1,001-5,000
43
10001+
8

Call center service providers by metro

MetroCompanies
Call center service providers in Houston21
Call center service providers in New York20
Call center service providers in Miami19
Call center service providers in Austin17
Call center service providers in Sheridan13
Call center service providers in Los Angeles13
Call center service providers in Orlando13

How this list was built

Source
The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion
Companies whose own business descriptions match “call center service providers”, with match quality audited by blind human judging, and headquartered in the United States.
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
Contact records re-verify on a rolling cadence; 19 contacts on this list were re-verified in the last 30 days.
Refresh
Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many call center service providers are there based in the United States?

There are 911 call center service providers headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Startek India, headquartered in Denver, tops this list with the largest team on record.

Which city has the most call center service providers?

Houston leads with 21 headquartered companies, followed by New York (20) and Miami (19).

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 4,792 verified decision-maker contacts tracked across these 911 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Related lists

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.

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