Company lists · Data refreshed September 2026

Top 14 Private security firms based in Washington, United States

Name: Private security firms based in Washington, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 33 companies tracked

RevenueBase identified 33 private security firms headquartered in Washington, United States as of September 2026 and tracks 575 professional contacts across them, including 74 with verified work emails. New York is the largest hub.

This list covers private security firms headquartered in Washington, 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 5, 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

33Companies

575Contacts tracked

74Verified emails

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The 14 largest private security firms based in Washington, United States

Ranked by team size

Top 14 of 33 private security firms based in Washington, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names private security firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Colorado Security AgencyPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	51-200	63
	“Established in 1974, Colorado Security Agency (CSA) is a professional security provider based in Georgetown Washington DC.” Source: company website · checked Sep 5, 2026
2	Global Security And Innovative Strategies GsisStrong evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	11-50	37
	“Global Security & Innovative Strategies (GSIS) leverages its extensive private sector, homeland, public security, public sector and international expertise to provide…” Source: company website · checked Sep 5, 2026
3	Valens GlobalPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	11-50	26
	“Valens Global takes a comprehensive, methodical, and thoughtful approach to security.” Source: company website · checked Sep 5, 2026
4	Hire PolicePartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	51-200	20
	“Hire Police is a physical security company that provides on-site physical security and roving security patrols using unarmed guards and armed officers.” Source: company website · checked Sep 5, 2026
5	Georgetown Protective ServicesPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	51-200	19
	“At Georgetown Protective Services, we provide top-tier security solutions tailored to your needs.” Source: company website · checked Sep 5, 2026
6	USP SecurityPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	201-500	11
	“At USP Security, we understand that safety is paramount, and we are dedicated to providing top-notch armed and unarmed security services for a diverse range of industries.” Source: company website · checked Sep 5, 2026
7	Atps SecurityIndirect evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	51-200	5
	“A.T.” Source: company website · checked Sep 5, 2026
8	XK GroupPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	4
	“XK Group provides advisory services Due Diligence Security Assessments Competitive Intelligence Background Investigations Crisis Management Insider Threat Analysis Fraud…” Source: company website · checked Sep 5, 2026
9	Axios Security GroupPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	11-50	3
	“Axios Security Group (ASG) is a veteran owned and operated Physical and Digital Security Consulting Company.” Source: company website · checked Sep 5, 2026
10	Iscg International Security Consulting GroupPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	3
	“International Security Consulting Group (ISCG) is a premier US-based security consultancy, driven by a team of dedicated, results-oriented professionals.” Source: company website · checked Sep 5, 2026
11	SpectrePartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	3
	“Discreet, bespoke international security, strategy and risk solutions.” Source: company website · checked Sep 5, 2026
12	ALUMAPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	3
	“Aluma is a risk management/security advisory firm that specializes in the U.S.” Source: company website · checked Sep 5, 2026
13	Clt3 Consulting, LLCPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	2
	“Drawing upon decades of experience protecting US Presidents and influential world leaders, CLT3 Security Consulting provides companies, government entities and individuals with…” Source: company website · checked Sep 5, 2026
14	Night OWL Protective Services, LLCPartial evidence	Washington, DC, United StatesHQ checked Sep 5, 2026	1-10	1
	“At Night Owl Protective Services we provide common sense, cost effective security protective services for any commercial or residential site in the nation's capital.” Source: company website · checked Sep 5, 2026

Showing 14 of 33 private security firms based in Washington, United States

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Private security firms based in Washington, United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

New YorkLargest hub · 148 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 Washington, over 33 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 private security firms, 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 Washington, United States whose own description of what they do matches “private security firms”. 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 private security firms, and records with no verified work email. Companies headquartered outside Washington 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, 74 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 5, 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.

Private security firms by metro in the United States

Private security firms in New York148
Private security firms in Los Angeles133
Private security firms in Houston102
Private security firms in Miami82
Private security firms in Chicago62
Private security firms in Atlanta60
Private security firms in Dallas59
Private security firms in Austin49
Private security firms in Phoenix44
Private security firms in Las Vegas43
Private security firms in Orlando37
Private security firms in Denver33
Private security firms in Washington33
Private security firms in Tampa31
Private security firms in San Diego28
Private security firms in Seattle28
Private security firms in Charlotte27
Private security firms in Nashville27
Private security firms in San Antonio25
Private security firms in San Francisco25

Frequently asked

How many private security firms are there based in Washington, United States?

RevenueBase identified 33 private security firms headquartered in Washington, 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?

Colorado Security Agency, headquartered in Washington, tops this list with the largest team on record.

Which city has the most private security firms?

New York leads with 148 headquartered companies, followed by Los Angeles (133) and Houston (102).

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 74 verified decision-maker contacts tracked across these 33 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 5, 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.