# IT services companies headquartered in Fairfax
Tamtam tracks 34 IT services companies headquartered in Fairfax. This list ranks the 30 largest by number of employees on LinkedIn, led by ECS, GovCIO and MAG Aerospace. Their median headcount is 359. Half of them were founded in 2000 or later.
The companies listed in Fairfax are primarily mid-sized firms specializing in IT services and defense manufacturing, with a strong focus on government contracts. Many of them offer advanced technology and digital solutions. For example, ECS provides cybersecurity solutions, GovCIO delivers IT solutions for government operations, and MAG Aerospace offers situational awareness solutions for global safety. General Dynamics Advanced Information Systems focuses on mission solutions for defense and intelligence.
A notable pattern among these companies is their significant involvement in serving government clients. Companies like ASM Research and Salient CRGT are dedicated providers of IT consulting and technology solutions for the federal government. This indicates a strong concentration of businesses catering to public sector needs in the Fairfax area.
๐บ๐ธ Fairfax ยท 30 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ECS](https://www.tamtam.ai/c/ecs-fairfax) (ecstech.com)
ECS provides advanced technology, science, and digital solutions to address cyber threats for customers in the public and private sectors | IT System Data Services | ๐บ๐ธ Fairfax | 3,996 | 1993 |
| 2 | [GovCIO](https://www.tamtam.ai/c/govcio) (govcio.com)
Deliver IT solutions and services using Agile methods and innovation to optimize government operations and support citizen-focused missions. | IT System Data Services | ๐บ๐ธ Fairfax | 3,164 | 2010 |
| 3 | [MAG Aerospace](https://www.tamtam.ai/c/mag-aerospace) (magaero.com)
Provider of real-time situational awareness solutions enabling global safety, delivering C5ISR services, joint domain command, and premier engineering & operational solutions worldwide Website: wwwmagaerocom | Defense and Space Manufacturing | ๐บ๐ธ Fairfax | 1,928 | 2009 |
| 4 | [General Dynamics Advanced Information Systems](https://www.tamtam.ai/c/general-dynamics-advanced-information-systems) (gd-ais.com)
An advanced information systems provider offering mission solutions for defense, intelligence, space, and homeland security, integrating land, air, sea, space, and cyber assets | Defense and Space Manufacturing | ๐บ๐ธ Fairfax | 1,840 | 1952 |
| 5 | [3Pillar](https://www.tamtam.ai/c/3pillar) (3pillarglobal.com)
Innovative product development partner driving rapid revenue and growth for industry leaders through lean, agile digital solutions across various technologies | Software Development | ๐บ๐ธ Fairfax | 1,709 | |
| 6 | [ASM Research](https://www.tamtam.ai/c/asm-research) (asmr.com)
A provider of technology solutions for the Federal government with expertise in IT, program management, security, healthcare, education, and training | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 1,678 | 1978 |
| 7 | [Riverside Research](https://www.tamtam.ai/c/riverside-research) (riversideresearch.org)
A nonprofit organization conducting independent research in various scientific fields to advance innovation and provide high-value solutions to government customers | Research Services | ๐บ๐ธ Fairfax | 801 | 1967 |
| 8 | [Salient CRGT](https://www.tamtam.ai/c/salient-crgt) (govcio.com)
Providing comprehensive government IT consulting and management services focused on mission success, innovation, and long-term client partnerships. | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 790 | 1998 |
| 9 | [IonIdea](https://www.tamtam.ai/c/ionidea) (ionidea.com)
A technology and business process solutions company focused on delivering excellent products, innovative technologies, and high-quality services through passionate professionals and best practices | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 783 | 1991 |
| 10 | [All Native Group, The Federal Services Division of Ho-Chunk Inc.](https://www.tamtam.ai/c/all-native-group-the-federal-services-division-of-ho-chunk-inc) (allnativegroup.com)
A government services provider offering training, health services, IT/telecommunications, staffing, professional services, and program management with key certifications | Government Relations Services | ๐บ๐ธ Fairfax | 445 | 1999 |
| 11 | [UCS](https://www.tamtam.ai/c/ucs) (ucs-inc.com)
A rapidly growing government contractor providing Enterprise IT Solutions and Health Services to improve performance across all levels of government | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 432 | 2000 |
| 12 | [ITC Federal](https://www.tamtam.ai/c/itc-federal) (itcfederal.com)
This company is a federal systems integrator focusing on technical and business solutions through innovative practices and skilled professionals | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 421 | 2006 |
| 13 | [ControlCase](https://www.tamtam.ai/c/controlcase) (controlcase.com)
IT compliance company providing peace of mind through proactive, innovative solutions, automation, and comprehensive services for various regulatory requirements in on-premise and cloud environments | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 392 | 2004 |
| 14 | [CC Pace](https://www.tamtam.ai/c/cc-pace) (ccpace.com)
A business & IT consulting firm in Fairfax, Virginia offering Business & Data Consulting, Digital Services, Agile Transformation, and technology staffing solutions nationwide | Staffing and Recruiting | ๐บ๐ธ Fairfax | 371 | 1980 |
| 15 | [INTEGRITYOne Partners](https://www.tamtam.ai/c/integrityone-partners) (ionep.com)
A business and technology services company specializing in helping Federal Government organizations address challenges and implement effective solutions | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 359 | 2001 |
| 16 | [Zimmerman Associates, Inc.](https://www.tamtam.ai/c/zimmerman-associates-inc) (zai-inc.com)
A Records and Information Management company in Fairfax, VA providing program management and engineering services to DoD entities, certified in ISO standards and CMMI Level 3 | Information Services | ๐บ๐ธ Fairfax | 315 | 1977 |
| 17 | [ICF Macro](https://www.tamtam.ai/c/icf-macro) (icf.com)
The company, now part of ICF, serves various markets and offers job opportunities through its website | Business Consulting and Services | ๐บ๐ธ Fairfax | 183 | |
| 18 | [Hadiamondstar Software Solutions LLC](https://www.tamtam.ai/c/hadiamondstar-software-solutions-llc) (hadiamondstar.com)
A global IT services company specializing in consulting and implementing solutions to help businesses re-engineer and compete successfully in the marketplace | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 104 | 2005 |
| 19 | [Quantrium](https://www.tamtam.ai/c/quantrium) (quantrium.ai)
An IT company specializing in AI, ML, Cloud, and Edge technologies, helping businesses improve efficiency and customer experience through practical applications | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 97 | 2019 |
| 20 | [Riverside Technology, inc.](https://www.tamtam.ai/c/riverside-technology-inc) (css-inc.com)
Provides innovative IT solutions for environmental decision support systems, using various environmental data sources for informed stakeholder decisions. | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 70 | 1985 |
| 21 | [Reinventing Geospatial, Inc. (RGi)](https://www.tamtam.ai/c/reinventing-geospatial-inc-rgi) (rgi-corp.com)
C5ISR innovator and geospatial expert in National Security. Immediate impact for soldiers and analysts through empowered, innovative critical thinkers. | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 51 | 2009 |
| 22 | [USmax Corporation](https://www.tamtam.ai/c/usmax-corporation) (usmax.com)
A leading IT services firm specializing in Cyber Security, Infrastructure Management, and Enterprise Applications for government, commercial, and non-profit organizations | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 33 | 1995 |
| 23 | [Elite Systems Inc.](https://www.tamtam.ai/c/elite-systems-inc) (elitesystems.com)
The company specializes in systems integration, cloud migration, software development, network and applications security, cyber security, RF benchmarking, wireless optimization, and IT staffing | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 28 | 1999 |
| 24 | [Intellisoft Technologies](https://www.tamtam.ai/c/intellisoft-technologies) (intellisoft-tech.com)
A leading provider of diverse IT solutions for Federal and Commercial sectors, offering consulting, training, software products, and outsourcing services | Software Development | ๐บ๐ธ Fairfax | 18 | 1995 |
| 25 | [Cogent](https://www.tamtam.ai/c/cogent) (cogent.partners)
A global leader in AI and Data Engineering outsourcing, specializing in implementing AI solutions for enterprises and startups to drive business impact | Software Development | ๐บ๐ธ Fairfax | 17 | 2023 |
| 26 | [Tiber Solutions LLC](https://www.tamtam.ai/c/tiber-solutions-llc) (tibersolutions.com)
A consultancy specializing in Data Warehousing and Analytics, helping government and commercial clients make better decisions through data-driven solutions | Information Services | ๐บ๐ธ Fairfax | 16 | 2005 |
| 27 | [Rotunda Solutions](https://www.tamtam.ai/c/rotunda-solutions) (rotundasolutions.com)
A SDVOSB specializing in data analytics and data science consulting for federal and commercial clients | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 15 | 2015 |
| 28 | [Advance Digital Systems](https://www.tamtam.ai/c/advance-digital-systems) (advancedigitalsys.com)
Provider of IT and consulting services for federal and commercial clients, offering a broad range of projects and services across various technologies | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 14 | |
| 29 | [Adaptalytics, LLC](https://www.tamtam.ai/c/adaptalytics-llc) (adaptalytics.com)
A leading data analytic consulting firm specializing in using data, technology, scientific methods, and creativity to solve complex business problems | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 13 | 2012 |
| 30 | [NumInformatics Inc.](https://www.tamtam.ai/c/numinformatics-inc) (numinformatics.com)
Consulting firm specializing in data analytics, machine learning, and AI technologies with experienced data scientists and consultants serving private, public, and government sectors | IT Services and IT Consulting | ๐บ๐ธ Fairfax | 8 | |
## How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
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- [IT Services and IT Consulting companies in Fairfax](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-fairfax) (36)
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## The same list elsewhere in United States
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- [IT services companies in Chicago](https://www.tamtam.ai/l/it-services-companies-chicago) (114)
- [IT services companies in Austin](https://www.tamtam.ai/l/it-services-companies-austin) (93)
- [IT services companies in Atlanta](https://www.tamtam.ai/l/it-services-companies-atlanta) (91)
- [IT services companies in Miami](https://www.tamtam.ai/l/it-services-companies-miami) (88)
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Source: https://www.tamtam.ai/l/it-services-companies-fairfax