Company lists · Data refreshed September 2026
Top 25 Government software contractors based in the United States
RevenueBase identified 1,232 government software contractors headquartered in the United States as of September 2026 and tracks 117,755 professional contacts across them, including 30,946 with verified work emails and 52,720 with mobile numbers. Washington is the largest hub.
This list covers government software contractors headquartered in the 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 3, 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.
The 25 largest government software contractors based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 24,019 | ||||
“GDIT is a global technology and professional services company that delivers solutions, technology and mission services to every major agency across the U.S.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 2 | 9,756 | ||||
“MANTECH is more than a technology company.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 3 | 6,863 | ||||
“Tyler Technologies (NYSE: TYL) provides integrated software and technology services to the public sector.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 4 | 4,524 | ||||
“ASRC Federal’s employees provide solutions for more than 30 U.S.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 5 | 2,378 | ||||
“For 25+ years, we’ve transformed the way government agencies serve their communities, providing software that delivers superior customer experiences, greater flexibility, and…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 6 | 1,899 | ||||
“Founded in 1975, AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,884 | ||||
“DCS delivers advanced technology and management solutions to Government agencies in the national security sector.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,693 | ||||
“DMI is a leading provider of digital services and technology solutions with a focus on end-to-end managed services, including managed mobility, cloud, cybersecurity, network…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,410 | ||||
“At Intrepid Global Solutions, we lead the way in mission-critical support where others can’t.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,037 | ||||
“Radiance Technologies, Inc.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 11 | The MIL CorporationPartial evidence | 942 | |||
“Established in 1980, MIL provides innovative cyber, engineering, financial, and information technology services to the federal government.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 12 | 906 | ||||
“CivicPlus is the only government technology company exclusively committed to powering and empowering governments to efficiently operate, serve, and govern through the use of our…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 13 | REI SystemsIndirect evidence | 861 | |||
“REI Systems delivers reliable and innovative technology solutions that empower federal, state, local, and nonprofit organizations to achieve their missions.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 14 | 830 | ||||
“At Cognosante, we help create a safe, healthy, more equitable nation for all.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 15 | 817 | ||||
“i3 Verticals seamlessly delivers integrated software and services to customers in Public Sector markets.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 16 | 771 | ||||
“CALIBRE Systems, Inc.(CALIBRE) is an employee-owned mission-focused solutions and digital transformation company supporting government and industry.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 17 | 752 | ||||
“Kay and Associates, Inc.(KAI) was established in 1960 by our founder Donald Kay to provide high quality, cost effective solutions in response to the need for engineering and…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 18 | 679 | ||||
“HX5, LLC has specialized in providing professional support services to meet the needs of Federal Government organizations since its incorporation in 2004.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 19 | 678 | ||||
“For over 25 years, NEOGOV has been at the forefront of public-sector innovation, building technology that helps government and education organizations work smarter, move faster…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 20 | 636 | ||||
“Telos empowers and protects the world’s most security-conscious organizations with solutions for continuous security assurance of individuals, systems, and information.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 21 | 608 | ||||
“Since 1988, PSI teams have provided our government customers with innovative, cost effective solutions that solve today’s complex challenges, improve operational efficiencies, and…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 22 | 537 | ||||
“Since 2005, TISTA has been a trusted partner with innovative IT solutions for the federal government.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 23 | 517 | ||||
“Euna Solutions® is a leading provider of purpose-built, cloud-based software that helps public sector and government organizations streamline procurement, budgeting, payments…” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 24 | Vencore INCIndirect evidence | 486 | |||
“As of June 1, 2018, we are Perspecta.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
| 25 | Tapestry SolutionsStrong evidence | 414 | |||
“Leveraging three decades of experience, Tapestry Solutions is a global provider of information management software and services for defense, government and commercial customers.” Source: company website · checked Sep 3, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,232 government software contractors based in the United States
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Government software contractors based in the United States at a glance
As of Sep 3, 2026Companies by employee count
Verified emails by last verification
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 software contractors, 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 the United States whose own description of what they do matches “government software contractors”. 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 government software contractors, and records with no verified work email. Companies headquartered outside United States 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, 30,946 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 3, 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 software contractors by metro
- Government software contractors in Washington55
- Government software contractors in Herndon42
- Government software contractors in Chantilly40
- Government software contractors in Reston40
- Government software contractors in Vienna28
- Government software contractors in Mclean27
- Government software contractors in Fairfax26
Frequently asked
How many government software contractors are there based in the United States?
RevenueBase identified 1,232 government software contractors headquartered in the 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?
General Dynamics Information Technology, headquartered in Falls Church, tops this list with the largest team on record.
Which city has the most government software contractors?
Washington leads with 55 headquartered companies, followed by Herndon (42) and Chantilly (40).
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 30,946 verified decision-maker contacts tracked across these 1,232 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 3, 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.
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