Company lists · Data refreshed September 2026
Top 14 Security companies based in Seattle, United States
This directory lists 44 security companies based in Seattle, United States, with 694 contacts and 131 email addresses for business research and outreach. As of September 2026, New York is the single most-represented city among the companies on the list.
Security companies provide services, systems, or products that protect people, property, facilities, data, networks, or other assets from security threats. This list covers companies that provide security products or services, including physical security, cybersecurity, monitoring, access control, risk management, and related protection solutions. Ranked by team size, largest first. Data current as of September 6, 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 14 largest security companies based in Seattle, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Guardian Security Systems, INCStrong evidence | 220 | |||
“Guardian Security Systems is the leader in residential and commercial life safety solutions.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 2 | Washington Alarm, INCStrong evidence | 44 | |||
“Washington Alarm is your local fire safety and security industry specialists, protecting both lives and property with fire alarm and security systems.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 3 | Seattle's Finest Security And Traffic ControlStrong evidence | 31 | |||
“Seattle’s Finest provides clients with a range of traffic control and security solutions within Washington State.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 4 | 21 | ||||
“Copperhead Consulting is a team of highly capable Agents, Investigators, Special Operations Veterans and technical professionals.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 5 | Watson SecurityStrong evidence | 16 | |||
“Rob Watson started working in the Security industry in 1979.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 6 | Secure Source International, LLCStrong evidence | 10 | |||
“Secure Source International is a global security risk mitigation firm that serves family offices, HNW individuals, corporate enterprises and law firms throughout the US and Europe.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 7 | RadiusvisionStrong evidence | 9 | |||
“RadiusVision delivers AI-powered video surveillance built for the places traditional security can't reach.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 8 | Northwest Alarm MonitoringStrong evidence | 8 | |||
“We are the premier wholesale alarm, burg, fire, life safety company with highest integrity of account security utilizing MAS software and CSAA certified operators with all the…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 9 | 8 | ||||
“DPS has been providing residential, commercial, and personal security services to the Washington State security sector for over 5 years.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 10 | Sound Security GroupStrong evidence | 5 | |||
“At Sound Security Group, we specialize in replacing underperforming security providers that fail to deliver on their promises.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 11 | 3 | ||||
“At Signal Security of Western Washington, our unwavering commitment is to set the gold standard in security services across residential, commercial, retail, and institutional…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 12 | 3 | ||||
“We are an IT consulting team that partners with clients to elevate their IT security skills and knowledge in crafting, deploying, and supporting intelligent and leading-edge IP…” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 13 | Homeland Patrol Division SecurityStrong evidence | 2 | |||
“Homeland Patrol Division Security, LLC (HPD) is a professional security guard company headquartered in Seattle Washington.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
| 14 | Str8 UP SecurityStrong evidence | 2 | |||
“We are STR8 UP, a Seattle based private security company.” Source: company website · checked Sep 6, 2026Thanks. The Data Team will review it. | |||||
Showing 14 of 44 security companies based in Seattle, United States
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Security companies based in Seattle, United States at a glance
As of Sep 6, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 44 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 security companies, 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 Seattle, United States whose own description of what they do matches “security companies”. 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 security companies, and records with no verified work email. Companies headquartered outside Seattle 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, 131 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 6, 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.
Security companies by metro in the United States
- Security companies in New York224
- Security companies in Los Angeles187
- Security companies in Houston184
- Security companies in Miami154
- Security companies in Chicago102
- Security companies in Atlanta99
- Security companies in Dallas99
- Security companies in Austin84
- Security companies in Phoenix84
- Security companies in Las Vegas67
- Security companies in Orlando66
- Security companies in San Antonio59
- Security companies in Tampa59
- Security companies in Charlotte56
- Security companies in Denver56
- Security companies in San Diego55
- Security companies in Indianapolis46
- Security companies in Sacramento46
- Security companies in San Francisco45
- Security companies in San Jose45
- Security companies in Jacksonville44
- Security companies in Seattle44
- Security companies in Baltimore42
- Security companies in Nashville37
- Security companies in Fort Lauderdale36
- Security companies in Columbus34
- Security companies in Memphis34
- Security companies in Portland34
- Security companies in Washington34
- Security companies in Philadelphia32
- Security companies in Raleigh32
- Security companies in Columbia31
- Security companies in Fort Worth31
- Security companies in Cincinnati30
- Security companies in Brooklyn29
- Security companies in Louisville28
- Security companies in Wilmington28
- Security companies in Albuquerque26
- Security companies in Richmond26
- Security companies in Riverside26
- Security companies in Springfield26
- Security companies in Boca Raton25
- Security companies in Boston25
- Security companies in Colorado Springs25
- Security companies in Irvine25
Frequently asked
How many security companies are based in Seattle, United States?
RevenueBase counts 44 security companies based in Seattle, United States on this list.
How many contacts and email addresses are available for security companies?
The list includes 694 contacts and 131 email addresses for security companies.
Which city has the most security companies on the list?
New York is the single most-represented city among the companies on the list.
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Security companies by geography
- Security companies based in the United States
- Security companies based in the United Kingdom
- Security companies based in Brazil
- Security companies based in France
- Security companies based in Canada
- Security companies based in Germany
- Security companies based in Italy
- Security companies based in Australia
- Security companies based in the Netherlands
- Security companies based in Mexico
- Security companies based in South Africa
- Security companies based in Spain
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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.