Skip to main content

Company lists · Data verified August 2026

Top 25 Customer service call centers based in the United States

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 656 companies tracked

There are 656 customer service call centers headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 47,132 professional contacts across them, including 4,048 with verified work emails and 9,120 with mobile numbers. Houston is the largest hub.

This list covers customer service 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. Data current as of August 28, 2026.

656Companies
47,132Contacts tracked
4,048Verified emails
9,120Mobile numbers
Unlock all 656 companies Free account · no credit card · 2 minutes

The 25 largest customer service call centers based in the United States

Ranked by team size
Top 25 of 656 customer service call centers 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
3Advanced Call Center Technologies, LLCJohnson City, TN5,001-10,0002,779282
4CAT Technologies ArgentinaMiami, FL1,001-5,0002,211323
5Infocision Management CorporationAkron, OH1,001-5,0001,773146
6SupportninjaAustin, TX1,001-5,0001,695547
7DialamericaMahwah, NJ1,001-5,0001,53750
8RDI CorporationCincinnati, OH1,001-5,0001,51238
9Senture, LLCLondon1,001-5,0001,477198
10Valor GlobalScottsdale, AZ1,001-5,0001,04472
11MCILas Cruces, NM5,001-10,00097452
12Inktel Contact Center SolutionsDoral, FL1,001-5,000905113
13AnswernetHorsham, PA501-1,000892148
14CBE CompaniesWaterloo, IA1,001-5,000838117
15Sequential Technology InternationalBethlehem1,001-5,00076243
16Global Contact Services GCSYuma, AZ501-1,0005429
17Contactus CommunicationsColumbus, OH1,001-5,00051335
18Coast Professional, INCWest Monroe, LA501-1,00050898
19OnesupportSan Marcos, TX1,001-5,000478114
20SupportzebraHouston, TX1,001-5,00045299
21Ansafone Contact CentersOcala, FL501-1,00042970
22The Connection Contact CenterBurnsville, MN1,001-5,0003536
23BoomsourcingLehi, UT501-1,00025413
24Mass MarketsWest Des Moines, IA501-1,00023516
25American SupportJacksonville, FL501-1,0001913

Showing 25 of 656 customer service call centers based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 4,048 reachable decision-makers.

Free account · no credit card

See all 656 companies

Customer service call centers based in the United States at a glance

As of Aug 28, 2026
51-200Median size (employees)
HoustonLargest hub · 17 HQs
9,120Contacts with mobile numbers
5Emails re-verified in last 30 days

Companies by employee count

1-10
102
11-50
199
51-200
176
201-500
85
501-1,000
39
1,001-5,000
37
5,001-10,000
7
10001+
8

Customer service call centers by metro

MetroCompanies
Customer service call centers in Houston17
Customer service call centers in Miami14
Customer service call centers in Los Angeles12
Customer service call centers in New York12
Customer service call centers in Austin12
Customer service call centers in Orlando11
Customer service call centers in Sheridan9

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 “customer service call centers”, 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; 5 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 customer service call centers are there based in the United States?

There are 656 customer service call centers 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 customer service call centers?

Houston leads with 17 headquartered companies, followed by Miami (14) and Los Angeles (12).

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 4,048 verified decision-maker contacts tracked across these 656 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.

Ready to reach these companies? Verified emails and direct dials for all 656 customer service call centers based in the United States. Start with a free account, no credit card.

Get the full list

Related lists

Browse: Companies home · All United States lists · All Customer service call centers lists · New lists

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.

More company lists