Company lists · Data refreshed September 2026

Top 25 IT services companies based in Fairfax, United States

Name: IT services companies based in Fairfax, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 64 companies tracked

RevenueBase identified 64 IT services companies headquartered in Fairfax, United States as of September 2026 and tracks 2,174 professional contacts across them, including 334 with verified work emails. New York is the largest hub.

This list covers IT services companies 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

64Companies

2,174Contacts tracked

334Verified emails

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The 25 largest IT services companies based in Fairfax, United States

Ranked by team size

Top 25 of 64 IT services companies 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 services companies: 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.
#	Company	Headquarters	Employees	Contacts
1	IonideaIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	1,001-5,000	780
	Source: company website · checked Sep 4, 2026
2	Future Technologies INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	201-500	196
	“FTI is dedicated to empowering customers with mission-critical technology solutions, helping solve their most complex challenges.” Source: company website · checked Sep 4, 2026
3	Concept Plus, LLCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	201-500	168
	“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
4	ICS Nett, Inc. ICSIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	144
	“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
5	Hadiamondstar Software Solutions LLCStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	99
	“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
6	Tiber Creek Consulting, INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	201-500	73
	“Tiber Creek Consulting Inc.” Source: company website · checked Sep 4, 2026
7	Luzon Technologies INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	65
	“We RECRUIT, We TRAIN, and We STAFF Transforming Challenges into Opportunities!” Source: company website · checked Sep 4, 2026
8	Siyaton Global Solutions INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	58
	“Siyaton as the title speaks is an impeccable target oriented company demonstrating equivalent results to every prospect, a universal provider of innovative consulting, technology…” Source: company website · checked Sep 4, 2026
9	BMW Of FairfaxIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	54
	“Bmw Of Fairfax is an information technology and services company based out of 8427 Lee Hwy, Fairfax, Virginia, United States.” Source: company website · checked Sep 4, 2026
10	Comter Systems INCStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	29
	“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
11	M3 Technology Consultants, INCStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	28
	“Trust Your IT Systems to Work.” Source: company website · checked Sep 4, 2026
12	XA Systems, LLCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	20
	“Established leadership and innovative service delivery methods supporting a wide range of Information Technology requirements.” Source: company website · checked Sep 4, 2026
13	Vizens CorpIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	19
	“VIZENS Corp is Software development & services company.” Source: company website · checked Sep 4, 2026
14	M2 Solutions INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	14
	“M² Solutions, Inc.” Source: company website · checked Sep 4, 2026
15	TellengerStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	13
	“Tellenger specializes in software development, enterprise IT and cloud solutions.” Source: company website · checked Sep 4, 2026
16	Information Analysis IncorporatedIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	11
	“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
17	SlableIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	11
	“Slable is a leader in innovative technology solutions, helping businesses take the hassle out of I.T- From VoIP phone systems to network and computer installations and…” Source: company website · checked Sep 4, 2026
18	Tharu Technologies LLCStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	10
	“Tharu Technologies is a Global IT professional consulting Company.” Source: company website · checked Sep 4, 2026
19	Advance Digital SystemsIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	9
	“Advance Digital Systems (ADS) is a leading provider of information technology and consulting services for federal and commercial clients.” Source: company website · checked Sep 4, 2026
20	Emagine It, INCStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	51-200	6
	“Emagine IT is an information technology services and consulting company based in the Washington, DC metropolitan area that specializes in delivering cost conscious, innovative…” Source: company website · checked Sep 4, 2026
21	TechclarityIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	1-10	5
	“Since 2003, TechClarity has served as a trusted partner to small- and medium-sized businesses across the Washington, DC metropolitan area.” Source: company website · checked Sep 4, 2026
22	Acs-I Advanced Computer Support, INCIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	4
	“Honesty - Integrity - Technology Advanced Computer Support, Inc.” Source: company website · checked Sep 4, 2026
23	Xala TechStrong evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	2
	“Xala Technology Services is one of the leading DC Metro area IT providers of reliable, dependable, dedicated cost-effective IT Support Company.” Source: company website · checked Sep 4, 2026
24	VoltsitIndirect evidence	Fairfax, VA, United StatesHQ checked Sep 4, 2026	11-50	1
	“Voltsit is a Global Business Consulting company.” Source: company website · checked Sep 4, 2026
25	Kobel Systems LLCIndirect evidence	Fairfax, VT, United StatesHQ checked Sep 4, 2026	1-10	1
	“In today’s fast-paced and competitive market, businesses must boost revenue, cut costs, and streamline operations, all while prioritizing security.” Source: company website · checked Sep 4, 2026

Showing 25 of 64 IT services companies based in Fairfax, United States

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IT services companies based in Fairfax, United States at a glance

As of Sep 4, 2026

11-50Median size (employees)

New YorkLargest hub · 636 HQs

Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 64 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 services companies, 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 services companies”. 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 services companies, 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, 334 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 services companies by metro in the United States

Frequently asked

How many IT services companies are there based in Fairfax, United States?

RevenueBase identified 64 IT services companies 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?

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

Which city has the most IT services companies?

New York leads with 636 headquartered companies, followed by Houston (408) and Austin (303).

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 334 verified decision-maker contacts tracked across these 64 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.

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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.