Company lists · Data refreshed September 2026

Top 25 IT professional services companies based in Fairfax, United States

Name: IT professional 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 27, 2026 68 companies tracked

RevenueBase identified 68 IT professional services companies headquartered in Fairfax, United States as of September 2026 and tracks 2,391 professional contacts across them, including 492 with verified work emails. Across the United States, New York is the largest hub for this category (583 companies); Fairfax has 68.

This list covers IT professional 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 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 27, 2026 86% judged on-target in blind review

68Companies

2,391Contacts tracked

492Verified emails

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

Ranked by team size

Top 25 of 68 IT professional services companies based in Fairfax, United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to IT professional services companies: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Ionidea	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	784 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026
2	Nationwide IT Services, INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	201-500	190 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 27, 2026
3	Concept Plus, LLC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	201-500	168 contacts →
	Indirect evidence “Concept Plus is a technology services company offering deep technical expertise, an experienced team, and a dedication to maximizing business productivity.” Source: RevenueBase Database · checked Sep 27, 2026
4	ICS Nett, Inc. ICS	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	140 contacts →
	Indirect evidence “ICS is a strategically diversified technology solutions company operating in different markets serving both Federal and Commercial clients with innovations that span…” Source: RevenueBase Database · checked Sep 27, 2026
5	Hadiamondstar Software Solutions LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	98 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 27, 2026
6	Inalab	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	91 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 27, 2026
7	Right&above	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	201-500	83 contacts →
	Indirect evidence “Right & Above helps companies use technology and AI to improve how they work, simplify processes, and create new products faster.” Source: RevenueBase Database · checked Sep 27, 2026
8	Inforeliance	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	201-500	70 contacts →
	Indirect evidence “When organizations need to be on time-and on budget-they call InfoReliance.” Source: RevenueBase Database · checked Sep 27, 2026
9	Luzon Technologies INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	65 contacts →
	Indirect evidence “We RECRUIT, We TRAIN, and We STAFF Transforming Challenges into Opportunities!” Source: RevenueBase Database · checked Sep 27, 2026
10	ERPI	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	201-500	57 contacts →
	Partial evidence “Enterprise Resource Performance Inc.(ERPi) is a professional services rm that delivers strategic, advisory, technological, and implementation support services to Federal Agencies.” Source: RevenueBase Database · checked Sep 27, 2026
11	Technova Systems	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	51 contacts →
	Indirect evidence “TechNova Systems is a technology consulting and workforce solutions company helping organizations build, scale, and modernize with confidence for 10 Years.” Source: RevenueBase Database · checked Sep 27, 2026
12	Codeplus	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	46 contacts →
	Indirect evidence “At CODEplus, we go beyond traditional technology providers to become your dedicated solution partner.” Source: RevenueBase Database · checked Sep 27, 2026
13	Comter Systems INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	29 contacts →
	Partial evidence “Comter Systems is a transformational IT services company which supports federal agencies, commercial enterprises, and non-profit organizations.” Source: RevenueBase Database · checked Sep 27, 2026
14	M3 Technology Consultants, INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	28 contacts →
	Partial evidence “Trust Your IT Systems to Work.” Source: RevenueBase Database · checked Sep 27, 2026
15	Galaxy Infotech INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	25 contacts →
	Partial evidence “Galaxy Infotech is a US based Staffing firm Headquartered in Fairfax, VA which provides high quality IT consultants to our clients.” Source: RevenueBase Database · checked Sep 27, 2026
16	Intellisoft Technologies	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	1,001-5,000	20 contacts →
	Indirect evidence “Empowering Innovation with Intellisoft Technologies, Inc.” Source: RevenueBase Database · checked Sep 27, 2026
17	XA Systems, LLC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	20 contacts →
	Indirect evidence “Established leadership and innovative service delivery methods supporting a wide range of Information Technology requirements.” Source: RevenueBase Database · checked Sep 27, 2026
18	Vizens Corp	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	19 contacts →
	Indirect evidence “VIZENS Corp is Software development & services company.” Source: RevenueBase Database · checked Sep 27, 2026
19	Tellenger	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	13 contacts →
	Partial evidence “Tellenger specializes in software development, enterprise IT and cloud solutions.” Source: RevenueBase Database · checked Sep 27, 2026
20	KEY Concepts Knowledgebase LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	12 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 27, 2026
21	Information Analysis Incorporated	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	11 contacts →
	Indirect evidence “Tellenger, Inc.(formerly Information Analysis Incorporated) is a wholly owned subsidiary subsidiary of WaveDancer, a publicly traded company (NASDAQ: WAVD), and certified small…” Source: RevenueBase Database · checked Sep 27, 2026
22	Sysalgo Technologies	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	10 contacts →
	Indirect evidence “We help Clients implement today’s latest Digital Technologies to Innovate, Transform and rapidly Grow.” Source: RevenueBase Database · checked Sep 27, 2026
23	Tharu Technologies LLC	Strong evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	10 contacts →
	Strong evidence “Tharu Technologies is a Global IT professional consulting Company.” Source: RevenueBase Database · checked Sep 27, 2026
24	Advance Digital Systems	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	51-200	9 contacts →
	Indirect evidence “Advance Digital Systems (ADS) is a leading provider of information technology and consulting services for federal and commercial clients.” Source: RevenueBase Database · checked Sep 27, 2026
25	Vanguard Management Solutions, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 2026	11-50	8 contacts →
	Indirect evidence “Vanguard Management Solutions (VMGTS) is a minority-owned cybersecurity and technology firm serving government and commercial organizations.” Source: RevenueBase Database · checked Sep 27, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: IT professional services companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names IT professional services companies.
Partial evidence: Its own public description names part of IT professional services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name IT professional services companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 68 IT professional services companies based in Fairfax, United States

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

As of Sep 27, 2026

20.6%Verified-email coverage

35.2Average contacts per company

11-50Median size (employees)

Sep 27, 2026Page data 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 for Fairfax, so it is reported there. Company counts and contact totals on this page are exact for Fairfax, over 68 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 professional services companies, 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 Fairfax, United States whose own description of what they do matches “IT professional services companies”. 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 IT professional services companies), 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 IT professional 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 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, 492 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 27, 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 professional services companies by metro in the United States

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

RevenueBase identified 68 IT professional 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 in the United States has the most IT professional services companies?

New York leads the United States with 583 headquartered companies, followed by Houston (455) and Dallas (343). Fairfax has 68.

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 492 verified decision-maker contacts tracked across these 68 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 27, 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 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.