Company lists · Data refreshed September 2026

Top 22 Government cybersecurity contractors based in Fairfax, United States

Name: Government cybersecurity contractors based in Fairfax, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 39 companies tracked

RevenueBase identified 39 government cybersecurity contractors headquartered in Fairfax, United States as of September 2026 and tracks 603 professional contacts across them, including 164 with verified work emails. Across the United States, New York is the largest hub for this category (129 companies); Fairfax has 39.

This list covers government cybersecurity contractors 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 28, 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 28, 2026 86% judged on-target in blind review

39Companies

603Contacts tracked

164Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 22 largest government cybersecurity contractors based in Fairfax, United States

Ranked by team size

Top 22 of 39 government cybersecurity contractors based in Fairfax, United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to government cybersecurity contractors: 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	Onpoint	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	104 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
2	JCS Solutions LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	81 contacts →
	Partial evidence “JCS Solutions is a premier cybersecurity and technology solutions provider.” Source: RevenueBase Database · checked Sep 28, 2026
3	Inforeliance	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 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 28, 2026
4	True Zero Technologies	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	53 contacts →
	Partial evidence “True Zero Technologies ("True Zero") is a seasoned, Veteran-Owned Small Business (VOSB) specializing in comprehensive cybersecurity and consulting services.” Source: RevenueBase Database · checked Sep 28, 2026
5	Usmax Corporation	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	39 contacts →
	Indirect evidence “USmax Corporation is an ISO 9001:2015 registered, ISO registered, ISO 27001:2013 registered, and CMMI-SVC Level 3 appraised Enterprise Information Technology (IT) and Professional…” Source: RevenueBase Database · checked Sep 28, 2026
6	Total Cyber Solutions	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	23 contacts →
	Partial evidence “We provide Vulnerability services including: Vulnerability Assessments Penetration Testing Compliance and Policy Analysis Cybersecurity as a Service (also known as MSP) Cloud…” Source: RevenueBase Database · checked Sep 28, 2026
7	Senet International	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	16 contacts →
	Indirect evidence “SeNet International Corporation is a company of information technology consulting professionals committed to helping public and private sector organizations securely operate their…” Source: RevenueBase Database · checked Sep 28, 2026
8	Polito, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
9	Lp3	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	14 contacts →
	Indirect evidence “LP3 is a highly experienced cyber and integration company with offices in Fairfax, VA, Syracuse, NY, St.” Source: RevenueBase Database · checked Sep 28, 2026
10	Assurit	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	13 contacts →
	Indirect evidence “CMMC Level 2 \| CAGE 6VE87 \| UEI DL3JL6J1XG98 \| SBA 8(a)\| 8(a) STARS \| HACS SINs \| CMMI-SVC \| ISO 9001 \| ISO 27001 \| ISO \| Assurit, an 8(a) certified and recognized leader in…” Source: RevenueBase Database · checked Sep 28, 2026
11	Datalock Consulting Group	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	9 contacts →
	Partial evidence “A Cybersecurity Firm Focused on Securing Mission-Critical Systems, Protecting Supply Chains, and Safeguarding Digital Assets Within Federal Agencies, While Ensuring Regulatory…” Source: RevenueBase Database · checked Sep 28, 2026
12	Deci Technology	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “IT consulting company providing cyber security, analytics and data science services.” Source: RevenueBase Database · checked Sep 28, 2026
13	Itfrastructure, Inc. D B A Itinfra	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Implementing Zero Trust Architecture to Enhance Security, Productivity, and Data Integrity, while Optimizing for Future-Readiness and Mission Success 8(a) Certified Small Business…” Source: RevenueBase Database · checked Sep 28, 2026
14	Purplesec	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	8 contacts →
	Indirect evidence “Committed to Intelligent Risk Defense.” Source: RevenueBase Database · checked Sep 28, 2026
15	Capsentinel	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	6 contacts →
	Partial evidence “CapSentinel is a Small Business that offers world class Information Technology (IT) Risk, Cybersecurity, and financial management solutions to help commercial and federal…” Source: RevenueBase Database · checked Sep 28, 2026
16	Emagine It, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	51-200	5 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 28, 2026
17	Cleared Systems	Strong evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	4 contacts →
	Strong evidence “Headquartered in Fairfax, VA, Cleared Systems specializes in helping federal contractors and highly regulated organizations meet cybersecurity and compliance requirements under…” Source: RevenueBase Database · checked Sep 28, 2026
18	Crosshair Cyber	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	11-50	3 contacts →
	Indirect evidence “Crosshair Cyber was founded by industry veterans who have over 20 years’ experience defending some of the most targeted, critical networks in the world-from banks to key…” Source: RevenueBase Database · checked Sep 28, 2026
19	Waveport Security	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	2 contacts →
	Indirect evidence “LEADING CYBER SOLUTIONS WavePort Security applies proven tools, professional services, and years of cyber-focused experience to create security strategies that provide unrivaled…” Source: RevenueBase Database · checked Sep 28, 2026
20	Grocyber	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	2 contacts →
	Indirect evidence “GroCyber brings over 4 decades of cyber security experience supporting large enterprise security programs and growing start-up and turn-around companies.” Source: RevenueBase Database · checked Sep 28, 2026
21	Cape Romain Solutions, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
22	Advanced Security & Infrastructure, Inc. ASI Federal	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	1-10	1 contacts →
	Indirect evidence “Advanced Security & Infrastructure (ASI) is a leading provider of technical, engineering, and support services for federal agencies.” Source: RevenueBase Database · checked Sep 28, 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: government cybersecurity contractors. 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 government cybersecurity contractors.
Partial evidence: Its own public description names part of government cybersecurity contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name government cybersecurity contractors. 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 22 of 39 government cybersecurity contractors based in Fairfax, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 164 reachable decision-makers.

Free signup · no credit card

View the full list →

Government cybersecurity contractors based in Fairfax, United States at a glance

As of Sep 28, 2026

27.2%Verified-email coverage

15.5Average contacts per company

11-50Median size (employees)

Sep 28, 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 39 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 government cybersecurity contractors, 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 “government cybersecurity contractors”. 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 government cybersecurity contractors), 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 government cybersecurity contractors, 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, 164 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 28, 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.

Government cybersecurity contractors 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 government cybersecurity contractors, 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 government cybersecurity contractors are there based in Fairfax, United States?

RevenueBase identified 39 government cybersecurity contractors 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?

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

Which city in the United States has the most government cybersecurity contractors?

New York leads the United States with 129 headquartered companies, followed by Washington (124) and Atlanta (101). Fairfax has 39.

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 164 verified decision-maker contacts tracked across these 39 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 28, 2026.

Ready to reach these companies? Verified emails and direct dials for all 39 government cybersecurity contractors based in Fairfax, United States. Start with a free account, no credit card.

Download this list →

Related lists

Government cybersecurity contractors by geography

Browse the directory

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.