Skip to main content

Company lists · Data refreshed September 2026

Top 25 Customer service consulting firms based in the United States

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 11,923 companies tracked

RevenueBase identified 11,923 customer service consulting firms headquartered in the United States as of September 2026 and tracks 178,913 professional contacts across them, including 39,971 with verified work emails and 43,356 with mobile numbers. New York is the largest hub.

This list covers customer service consulting firms 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 24, 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 24, 2026 86% judged on-target in blind review
11,923Companies
178,913Contacts tracked
39,971Verified emails
43,356Mobile numbers
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest customer service consulting firms based in the United States

Ranked by team size
Top 25 of 11,923 customer service consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to customer service consulting firms: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1
Alorica
Partial evidenceIrvine, CA, United StatesHQ checked Sep 24, 202610001+47,558 contacts →

Partial evidence

“We’re passionate about creating customers for life by designing experiences that elevate your brand.”

Source: RevenueBase Database · checked Sep 24, 2026
2
Slalom
Partial evidenceSeattle, WA, United StatesHQ checked Sep 24, 202610001+10,032 contacts →

Partial evidence

“Slalom is a fiercely human business and technology consulting company that leads with outcomes to bring more value, in all ways, always.”

Source: RevenueBase Database · checked Sep 24, 2026
3
Protiviti
Partial evidenceMenlo Park, CA, United StatesHQ checked Sep 24, 20265,001-10,0008,779 contacts →

Partial evidence

“Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…”

Source: RevenueBase Database · checked Sep 24, 2026
4
Everise
Partial evidencePlantation, FL, United StatesHQ checked Sep 24, 202610001+5,863 contacts →

Partial evidence

“Everise delivers happiness to millions of customers around the world.”

Source: RevenueBase Database · checked Sep 24, 2026
5
Qualfon
Partial evidenceHighland Park, MI, United StatesHQ checked Sep 24, 202610001+5,840 contacts →

Partial evidence

“Qualfon provides 360 degrees of customer experience support for your business with mission-driven processes that keep each person at the heart of every interaction.”

Source: RevenueBase Database · checked Sep 24, 2026
6
Accenture Strategy & Consulting
Indirect evidenceChicago, IL, United StatesHQ checked Sep 24, 20265,001-10,0005,514 contacts →

Indirect evidence

“Accenture Strategy combines deep industry expertise, advanced analytics capabilities and human-led design methodologies that enable clients to act with speed and confidence.”

Source: RevenueBase Database · checked Sep 24, 2026
7
Fusion CX
Partial evidenceNorcross, GA, United StatesHQ checked Sep 24, 202610001+4,785 contacts →

Partial evidence

“At Fusion CX, we revolutionize customer experience by blending innovative technology and human connection.”

Source: RevenueBase Database · checked Sep 24, 2026
8
Harte Hanks
Partial evidenceChelmsford, MA, United StatesHQ checked Sep 24, 20261,001-5,0003,901 contacts →

Partial evidence

“We are The Customer Company®, a global leader in Customer Experience (CX), Omnichannel Marketing, Data Services, Customer Care, Fulfillment, and Logistics.”

Source: RevenueBase Database · checked Sep 24, 2026
9
Advanced Call Center Technologies, LLC
Indirect evidenceBerwyn, PA, United StatesHQ checked Sep 24, 20265,001-10,0002,774 contacts →

Indirect 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 24, 2026
10
Op360 Officepartners360
Partial evidenceRidgefield, CT, United StatesHQ checked Sep 24, 20261,001-5,0001,777 contacts →

Partial evidence

“OP360, part of iQor CXBPO™, is a trusted partner in intelligent customer experience solutions for global brands.”

Source: RevenueBase Database · checked Sep 24, 2026
11
MCA
Partial evidenceWestport, CT, United StatesHQ checked Sep 24, 2026n/a1,650 contacts →

Partial evidence

“MCAworks is a strategic marketing consulting firm passionately dedicated to helping our clients accelerate and sustain business growth.”

Source: RevenueBase Database · checked Sep 24, 2026
12
Argano
Indirect evidencePlano, TX, United StatesHQ checked Sep 24, 20261,001-5,0001,603 contacts →

Indirect evidence

“Argano is the world’s first and largest digital services consultancy focused exclusively on enabling high performance across our clients’ business operations, at scale and around…”

Source: RevenueBase Database · checked Sep 24, 2026
13
Servion Global Solutions
Strong evidencePrinceton, NJ, United StatesHQ checked Sep 24, 20261,001-5,0001,250 contacts →

Strong evidence

“Servion is a CX Consulting and global systems integrator (SI) headquartered in the United States, with over three decades in customer experience (CX) transformation.”

Source: RevenueBase Database · checked Sep 24, 2026
14
W3global
Partial evidenceFrisco, TX, United StatesHQ checked Sep 24, 2026501-1,0001,149 contacts →

Partial evidence

“W3Global is a leading provider of end-to-end consulting services, empowering businesses to achieve their strategic goals and optimize their operations.”

Source: RevenueBase Database · checked Sep 24, 2026
15
Talentpop
Partial evidenceCosta Mesa, CA, United StatesHQ checked Sep 24, 2026501-1,000747 contacts →

Partial evidence

“TalentPop is a leading Customer Service Management Agency that works with over 500 fast-growing E-Commerce brands to revolutionize their customer service and turn customer service…”

Source: RevenueBase Database · checked Sep 24, 2026
16
Clearsource BPO
Partial evidenceSandy, UT, United StatesHQ checked Sep 24, 20261,001-5,000708 contacts →

Partial evidence

“ClearSource at its core is a customer experience company.”

Source: RevenueBase Database · checked Sep 24, 2026
17
Prophet
Partial evidenceSan Francisco, CA, United StatesHQ checked Sep 24, 2026501-1,000661 contacts →

Partial evidence

“Prophet is the Uncommon Growth Company-accelerating impact for business and marketing leaders through consulting, experience, and creative services.”

Source: RevenueBase Database · checked Sep 24, 2026
18
Clear Harbor
Indirect evidenceBirmingham, AL, United StatesHQ checked Sep 24, 20261,001-5,000647 contacts →

Indirect evidence

“CLEAR HARBOR, Leader in How Agents Exist in an AI World.”

Source: RevenueBase Database · checked Sep 24, 2026
19
Analytix Solutions
Indirect evidenceWoburn, MA, United StatesHQ checked Sep 24, 2026501-1,000640 contacts →

Indirect evidence

“Welcome to Analytix Solutions!”

Source: RevenueBase Database · checked Sep 24, 2026
20
SEI
Partial evidenceCincinnati, OH, United StatesHQ checked Sep 24, 2026501-1,000618 contacts →

Partial evidence

“SEI is a management consulting firm delivering fresh perspectives and reliable results.”

Source: RevenueBase Database · checked Sep 24, 2026
21
Global Contact Services GCS
Partial evidenceSalisbury, NC, United StatesHQ checked Sep 24, 2026501-1,000542 contacts →

Partial evidence

“We are customer service experts.”

Source: RevenueBase Database · checked Sep 24, 2026
22
American Customer Care
Partial evidenceBristol, CT, United StatesHQ checked Sep 24, 20261,001-5,000513 contacts →

Partial evidence

“American Customer Care specializes in providing individualized contact with your customers.”

Source: RevenueBase Database · checked Sep 24, 2026
23
Logic, Part Of Accenture
Indirect evidenceBloomington, MN, United StatesHQ checked Sep 24, 20261,001-5,000496 contacts →

Indirect evidence

“Logic works with the world’s leading retailers to help them move faster, innovate smarter, and thrive in the face of retail disruption.”

Source: RevenueBase Database · checked Sep 24, 2026
24
Onesupport
Partial evidenceSan Marcos, TX, United StatesHQ checked Sep 24, 20261,001-5,000475 contacts →

Partial evidence

“OneSupport is a leading provider of customer experience, technical support, and sales enablement solutions for technology products and services.”

Source: RevenueBase Database · checked Sep 24, 2026
25
Sendero
Strong evidenceDallas, TX, United StatesHQ checked Sep 24, 2026201-500420 contacts →

Strong evidence

“Sendero is a management consulting firm that optimizes technology, improves operations, advances workforce productivity, and enhances customer experience-all to deliver tangible…”

Source: RevenueBase Database · checked Sep 24, 2026

Showing 25 of 11,923 customer service consulting firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 39,971 reachable decision-makers.

Free signup · no credit card

View the full list →

Customer service consulting firms based in the United States at a glance

As of Sep 24, 2026
22.3%Verified-email coverage
24.2%Mobile-number coverage
15.0Average contacts per company
1-10Median size (employees)
4.1%Largest-city concentration · New York
Sep 24, 2026Page data refreshed

Companies by employee count

1-10
9,207
11-50
2,020
51-200
455
201-500
118
501-1,000
53
1,001-5,000
37
5,001-10,000
4
10001+
19

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 27.0d

Company record updated

Median 88.0d

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 customer service consulting firms, 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 “customer service consulting firms”. 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 customer service consulting firms), 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 customer service consulting firms, 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, 39,971 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 24, 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.

Customer service consulting firms by metro

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 customer service consulting firms, 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 customer service consulting firms are there based in the United States?

RevenueBase identified 11,923 customer service consulting firms 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?

Alorica, headquartered in Irvine, tops this list with the largest team on record.

Which city has the most customer service consulting firms?

New York leads with 485 headquartered companies, followed by Atlanta (302) and Chicago (291).

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 39,971 verified decision-maker contacts tracked across these 11,923 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 24, 2026.

Ready to reach these companies? Verified emails and direct dials for all 11,923 customer service consulting firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

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.

More company lists