Top IT Services Companies In Northern Virginia In 2027

Last updated: November 14, 2026

The top IT services companies in Northern Virginia in 2027 are Booz Allen Hamilton, Leidos, SAIC, CACI, General Dynamics Information Technology, ManTech, Peraton, Accenture Federal Services, ICF and Iron Bow Technologies. Together they deliver a large share of federal IT modernization, cybersecurity, cloud and mission systems work.

Northern Virginia, from Arlington and McLean to Reston, Herndon and Chantilly, is the center of the federal IT market. Proximity to the Pentagon, the intelligence community and civilian agencies has made it home to the largest government technology integrators, along with thousands of small businesses that team with them.

For smaller managed IT providers that serve local businesses, see our managed IT services in Northern Virginia list.

Northern Virginia IT Services Companies At A Glance

Company	Headquarters	Founded	Focus
Booz Allen Hamilton	McLean, VA	1914	Consulting, AI, cyber and mission engineering
Leidos	Reston, VA	1969	Defense, health, civil and intelligence IT
SAIC	Reston, VA	2013 (as current company)	IT modernization and mission systems
CACI International	Reston, VA	1962	Intelligence, cyber and enterprise IT
General Dynamics Information Technology	Falls Church, VA	Part of General Dynamics	Large-scale federal IT and digital modernization
ManTech	Herndon, VA	1968	Cyber, data and mission IT
Peraton	Reston, VA	2017	Space, intelligence and citizen services IT
Accenture Federal Services	Arlington, VA	Part of Accenture	Digital transformation for federal agencies
ICF	Reston, VA	1969	Digital, data and policy consulting
Iron Bow Technologies	Herndon, VA	1983	Technology solutions and IT integration

The Top IT Services Companies In Northern Virginia In 2027

1. Booz Allen Hamilton — The Largest Consulting-Led Federal Technology Firm

Founded in 1914 and headquartered in McLean, Booz Allen provides consulting, AI, cybersecurity and engineering to defense, intelligence and civil agencies.

It is the default name when agencies want consulting depth combined with technology delivery.

2. Leidos — A Science And Technology Giant Across Defense, Health And Civil

Reston-based Leidos delivers IT, engineering and mission systems across defense, intelligence, health and civil markets.

Its scale makes it a frequent prime on the largest federal programs.

3. SAIC — IT Modernization And Mission Integration

SAIC, headquartered in Reston, focuses on IT modernization, cloud, enterprise IT and mission systems for defense and civilian customers.

It is a strong partner for large modernization efforts.

4. CACI International — Intelligence, Cyber And Enterprise Technology

CACI, founded in 1962, provides expertise and technology for intelligence, defense and federal civilian missions, including electronic warfare and cyber.

It is a key player in national security IT.

5. General Dynamics Information Technology — Federal IT At Massive Scale

GDIT, the IT business of General Dynamics headquartered in Falls Church, runs large enterprise IT, cloud and digital modernization programs.

It suits agencies with complex, mission-critical environments.

6. ManTech — Cyber, Data And Mission IT For National Security

ManTech, founded in 1968 and headquartered in Herndon, delivers cyber, data, IT and mission solutions to national security agencies.

It is a frequent partner on intelligence and defense programs.

7. Peraton — Space, Intelligence And Citizen-Facing Systems

Peraton, formed in 2017 and grown through major acquisitions, supports space, intelligence, defense, health and citizen services missions.

It is one of the largest privately held federal integrators.

8. Accenture Federal Services — Commercial-Grade Digital Transformation For Agencies

Accenture Federal Services, headquartered in Arlington, brings Accenture’s commercial technology and design capabilities to federal agencies.

It suits agencies pursuing large digital and customer experience programs.

9. ICF — Digital Modernization With Policy And Program Expertise

ICF, founded in 1969 and based in Reston, combines digital, data and technology services with deep policy and program knowledge.

It is strong in health, energy and civilian agency work.

10. Iron Bow Technologies — Technology Solutions Provider For Government

Iron Bow provides IT solutions, integration and managed services to government and commercial customers.

It is a common channel for agencies buying infrastructure, collaboration and cybersecurity technology.

How We Evaluated These Companies

• Presence and headquarters in Northern Virginia
• Scale and range of federal IT services
• Mission areas served: defense, intelligence, civil and health
• Importance as primes and teaming partners for smaller firms

How To Work With Northern Virginia IT Primes

Small businesses often grow by subcontracting to these firms. Register with their supplier portals, attend small business events, and show specific capabilities and past performance. Make sure your compliance is in order: many primes require CMMC readiness. See our CMMC RPO list and guide to winning government contracts.

Frequently Asked Questions

Why are so many IT companies in Northern Virginia?

Northern Virginia is close to the Pentagon, intelligence agencies and federal headquarters, which concentrates federal IT spending and talent in the region.

Which is the largest IT services company in Northern Virginia?

Booz Allen Hamilton, Leidos, SAIC, CACI and GDIT are among the largest by federal revenue.

Can small businesses partner with these companies?

Yes. Large primes run small business programs and subcontract work to meet small business goals.

Do these companies hire cleared professionals?

Yes. Many roles require security clearances, especially in defense and intelligence work.

Conclusion

Northern Virginia hosts the core of the federal IT industry. These ten firms lead it, and they also anchor a large ecosystem of small businesses and specialists across the region.

For more rankings, comparisons and guides on this topic, visit the Washington DC & Northern Virginia hub.