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Company lists · Data refreshed September 2026

Top 25 IT consulting firms based in Fairfax, United States

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 113 companies tracked

RevenueBase identified 113 IT consulting firms headquartered in Fairfax, United States as of September 2026 and tracks 4,277 professional contacts across them, including 580 with verified work emails. New York is the largest hub.

This list covers IT consulting firms headquartered in Fairfax, 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
113Companies
4,277Contacts tracked
580Verified emails
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The 25 largest IT consulting firms based in Fairfax, United States

Ranked by team size
Top 25 of 113 IT consulting firms based in Fairfax, United States, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names IT consulting firms: 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.
#CompanyHeadquartersEmployeesContacts
1
ASM ResearchIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 20261,001-5,0001,556

“ASM Research, an Accenture Federal Services Company, is an information solutions integrator and a leading provider of innovative technology solutions and advanced analytical…”

Source: company website · checked Sep 4, 2026
2
IonideaIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 20261,001-5,000780
Source: company website · checked Sep 4, 2026
3
Nationwide IT Services, INCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 2026201-500194

“Nationwide IT Services, Inc.(NIS) is designated 8(a) by the SBA, and a CVE verified Service Disabled Veteran Owned Small Business (SDVOSB) Information Technology (IT) and…”

Source: company website · checked Sep 4, 2026
4
Concept Plus, LLCIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 2026201-500168

“Concept Plus is a technology services company offering deep technical expertise, an experienced team, and a dedication to maximizing business productivity.”

Source: company website · checked Sep 4, 2026
5
ICS Nett, Inc. ICSIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-200144

“ICS is a strategically diversified technology solutions company operating in different markets serving both Federal and Commercial clients with innovations that span…”

Source: company website · checked Sep 4, 2026
6
OnpointPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-50104

“OnPoint is a technology and consulting services partner helping government leaders secure their systems, effectively operate, and deliver critical services in today’s increasingly…”

Source: company website · checked Sep 4, 2026
7
Hadiamondstar Software Solutions LLCStrong evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20099

“Hadiamondstar Software Solutions LLC Known as is a leading Global Consulting and IT Services company, offering a wide array of solutions ranging from strategy consulting right…”

Source: company website · checked Sep 4, 2026
8
InalabStrong evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20090

“Inalab is a leading IT solutions and strategy consulting firm focused on providing solutions that transform enterprise operations in the government and commercial sectors by…”

Source: company website · checked Sep 4, 2026
9
Tiber Creek Consulting, INCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 2026201-50073

“Tiber Creek Consulting Inc.”

Source: company website · checked Sep 4, 2026
10
Luzon Technologies INCIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20065

“We RECRUIT, We TRAIN, and We STAFF Transforming Challenges into Opportunities!”

Source: company website · checked Sep 4, 2026
11
ERPIIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 2026201-50058

“Enterprise Resource Performance Inc.(ERPi) is a professional services rm that delivers strategic, advisory, technological, and implementation support services to Federal Agencies.”

Source: company website · checked Sep 4, 2026
12
CodeplusIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20049

“At CODEplus, we go beyond traditional technology providers to become your dedicated solution partner.”

Source: company website · checked Sep 4, 2026
13
Technova SystemsPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20049

“TechNova Systems is a technology consulting and workforce solutions company helping organizations build, scale, and modernize with confidence for 10 Years.”

Source: company website · checked Sep 4, 2026
14
Comter Systems INCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5029

“Comter Systems is a transformational IT services company which supports federal agencies, commercial enterprises, and non-profit organizations.”

Source: company website · checked Sep 4, 2026
15
M3 Technology Consultants, INCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5028

“Trust Your IT Systems to Work.”

Source: company website · checked Sep 4, 2026
16
Five 9 Group, INCIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20027
Source: company website · checked Sep 4, 2026
17
XA Systems, LLCIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20020

“Established leadership and innovative service delivery methods supporting a wide range of Information Technology requirements.”

Source: company website · checked Sep 4, 2026
18
Intellisoft TechnologiesIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 20261,001-5,00019

“Empowering Innovation with Intellisoft Technologies, Inc.”

Source: company website · checked Sep 4, 2026
19
Vizens CorpIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202651-20019

“VIZENS Corp is Software development & services company.”

Source: company website · checked Sep 4, 2026
20
Senet InternationalPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5016

“SeNet International Corporation is a company of information technology consulting professionals committed to helping public and private sector organizations securely operate their…”

Source: company website · checked Sep 4, 2026
21
KEY Concepts Knowledgebase LLCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5015

“WHO ARE WE: We are a solutions driven enterprise based in the DC Area, that is founded on the provision of quality services, creatve business and IT solutions, and responsible…”

Source: company website · checked Sep 4, 2026
22
TellengerPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5013

“Tellenger specializes in software development, enterprise IT and cloud solutions.”

Source: company website · checked Sep 4, 2026
23
Symposit LLCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5012

“Symposit LLC is an advisory management firm that specializes in leveraging information technology (IT) to provide value to it's clients by optimizing operations, reducing risk…”

Source: company website · checked Sep 4, 2026
24
Gunnison Consulting Group, INCPartial evidence
Fairfax, VA, United StatesHQ checked Sep 4, 2026201-50011

“In 1994 Gunnison Consulting Group began serving the greater Washington, D.C.”

Source: company website · checked Sep 4, 2026
25
Information Analysis IncorporatedIndirect evidence
Fairfax, VA, United StatesHQ checked Sep 4, 202611-5011

“Tellenger, Inc.(formerly Information Analysis Incorporated) is a wholly owned subsidiary subsidiary of WaveDancer, a publicly traded company (NASDAQ: WAVD), and certified small…”

Source: company website · checked Sep 4, 2026

Showing 25 of 113 IT consulting firms based in Fairfax, United States

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IT consulting firms based in Fairfax, United States at a glance

As of Sep 4, 2026
11-50Median size (employees)
New YorkLargest hub · 1002 HQs
Contacts with mobile numbers
Sep 4, 2026Data refreshed

Companies by employee count

1-10
53
11-50
34
51-200
16
201-500
6
1,001-5,000
3

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Fairfax, over 113 companies.

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 IT consulting firms, 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 Fairfax, United States whose own description of what they do matches “IT consulting firms”. 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 IT consulting firms, and records with no verified work email. Companies headquartered outside Fairfax 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, 580 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.

IT consulting firms by metro in the United States

Frequently asked

How many IT consulting firms are there based in Fairfax, United States?

RevenueBase identified 113 IT consulting firms headquartered in Fairfax, 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?

ASM Research, headquartered in Fairfax, tops this list with the largest team on record.

Which city has the most IT consulting firms?

New York leads with 1002 headquartered companies, followed by Houston (627) and Dallas (504).

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 580 verified decision-maker contacts tracked across these 113 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.

Ready to reach these companies? Verified emails and direct dials for all 113 IT consulting firms based in Fairfax, United States. Start with a free account, no credit card.

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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.

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