Company lists · Data refreshed September 2026

Top 25 Alarm monitoring services based in the United States

Name: Alarm monitoring services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 2,014 companies tracked

RevenueBase identified 2,014 alarm monitoring services headquartered in the United States as of September 2026 and tracks 34,244 professional contacts across them, including 8,440 with verified work emails. Houston is the largest hub.

This list covers alarm monitoring services 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 19, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

2,014Companies

34,244Contacts tracked

8,440Verified emails

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The 25 largest alarm monitoring services based in the United States

Ranked by team size

Top 25 of 2,014 alarm monitoring services based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to alarm monitoring services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Everon	Indirect evidence	Irving, TX, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,045 contacts →
	Indirect evidence “Everon is a leading national provider of commercial security, video, fire, sprinkler, and life safety solutions for complex, multi-site businesses and organizations.” Source: RevenueBase Database · checked Sep 19, 2026
2	Vector Security	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,287 contacts →
	Indirect evidence “Vector Security® has protected people and property by providing intelligent security solutions tailored to the needs of the customer for more than 50 years.” Source: RevenueBase Database · checked Sep 19, 2026
3	Safe Haven Security Services, LLC	Indirect evidence	North Kansas City, MO, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,276 contacts →
	Indirect evidence “Established in Safe Haven Security has grown to become the nation’s largest ADT-authorized dealer, trusted by homeowners and businesses across the country.” Source: RevenueBase Database · checked Sep 19, 2026
4	Simplisafe	Indirect evidence	Boston, MA, United StatesHQ checked Sep 19, 2026	501-1,000	1,253 contacts →
	Indirect evidence “Being safe should be simple.” Source: RevenueBase Database · checked Sep 19, 2026
5	Defenders	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 2026	1,001-5,000	885 contacts →
	Indirect evidence “DEFENDERS is a leader in the home security industry, providing safety and peace of mind to more than 1.5 million families nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
6	Securitas Electronic Security, INC	Indirect evidence	Uniontown, OH, United StatesHQ checked Sep 19, 2026	10001+	839 contacts →
	Indirect evidence “Securitas knows Security.” Source: RevenueBase Database · checked Sep 19, 2026
7	ADT Commercial	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 19, 2026	n/a	799 contacts →
	Indirect evidence “ADT Commercial, LLC was acquired by GTCR and is now Everon, LLC.” Source: RevenueBase Database · checked Sep 19, 2026
8	CPI Security	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 19, 2026	501-1,000	763 contacts →
	Indirect evidence “For more than 30 years, CPI Security has been a leader in customized home and business security and home automation services.” Source: RevenueBase Database · checked Sep 19, 2026
9	Guardian Protection	Indirect evidence	Warrendale, PA, United StatesHQ checked Sep 19, 2026	501-1,000	677 contacts →
	Indirect evidence “Protecting homes and businesses since 1950, Guardian Protection is one of the nation's largest and most highly regarded security companies.” Source: RevenueBase Database · checked Sep 19, 2026
10	Alert 360	Indirect evidence	Tulsa, TX, United StatesHQ checked Sep 19, 2026	501-1,000	572 contacts →
	Indirect evidence “Alert 360 security is a trusted and best-in-class provider of reliable security solutions for homes and businesses.” Source: RevenueBase Database · checked Sep 19, 2026
11	Rapid Response Monitoring	Partial evidence	Syracuse, NY, United StatesHQ checked Sep 19, 2026	501-1,000	490 contacts →
	Partial evidence “Rapid Response Monitoring is a leading provider of professional monitoring services founded in 1992.” Source: RevenueBase Database · checked Sep 19, 2026
12	Guardian Alarm	Partial evidence	Southfield, MI, United StatesHQ checked Sep 19, 2026	501-1,000	389 contacts →
	Partial evidence “Guardian Alarm is one of the largest independently-owned security companies protecting both homes and businesses throughout the Midwest.” Source: RevenueBase Database · checked Sep 19, 2026
13	Becklar Monitoring	Partial evidence	Ogden, UT, United StatesHQ checked Sep 19, 2026	201-500	375 contacts →
	Partial evidence “As the premier provider of critical event monitoring across North America, Becklar Monitoring is prepared to monitor any event, anytime, with speed, accuracy and exceptional…” Source: RevenueBase Database · checked Sep 19, 2026
14	Life Protect 24 7	Partial evidence	Norfolk, VA, United StatesHQ checked Sep 19, 2026	501-1,000	339 contacts →
	Partial evidence “As the nation's leading medical device service and monitoring company, we are committed to improving the standard of independent living and promote healthy aging through our…” Source: RevenueBase Database · checked Sep 19, 2026
15	ADS Security	Indirect evidence	Nashville, TN, United StatesHQ checked Sep 19, 2026	201-500	324 contacts →
	Indirect evidence “Headquartered in Nashville, TN, with branches throughout the Southeastern United States, ADS Security, a Vector Security company, is the 20th largest electronic security company…” Source: RevenueBase Database · checked Sep 19, 2026
16	Cops Monitoring	Partial evidence	Williamstown, NJ, United StatesHQ checked Sep 19, 2026	501-1,000	312 contacts →
	Partial evidence “Headquartered in Williamstown, NJ, COPS Monitoring is a leading provider of professional monitoring services in North America with comprehensive redundancy.” Source: RevenueBase Database · checked Sep 19, 2026
17	AFA Protective Systems, INC	Indirect evidence	Syosset, NY, United StatesHQ checked Sep 19, 2026	201-500	302 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
18	Dynafire	Partial evidence	Casselberry, FL, United StatesHQ checked Sep 19, 2026	201-500	258 contacts →
	Partial evidence “DynaFire, a leader in Fire & Life Safety, offers unparalleled services across fire alarm systems, fire suppression systems, fire sprinkler systems, fire extinguishers, BDA…” Source: RevenueBase Database · checked Sep 19, 2026
19	Alarm Detection Systems	Partial evidence	Aurora, IL, United StatesHQ checked Sep 19, 2026	201-500	225 contacts →
	Partial evidence “Family owned and operated since 1968, Alarm Detection Systems, Inc.(ADS) understands that nothing is more important than the safety of your family and the protection of your…” Source: RevenueBase Database · checked Sep 19, 2026
20	Guardian Security Systems, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	220 contacts →
	Indirect evidence “Guardian Security Systems is the leader in residential and commercial life safety solutions.” Source: RevenueBase Database · checked Sep 19, 2026
21	Affiliated Monitoring	Strong evidence	Union, NJ, United StatesHQ checked Sep 19, 2026	501-1,000	218 contacts →
	Strong evidence “Affiliated Monitoring combines over 40 years experience in alarm, fire and PERS monitoring with the latest technology to service security professionals nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
22	DGA Security	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	201-500	206 contacts →
	Indirect evidence “Since 1969, thousands of businesses across the country have entrusted their protection to DGA Security.” Source: RevenueBase Database · checked Sep 19, 2026
23	APX Alarm Security Solutions INC	Indirect evidence	Provo, UT, United StatesHQ checked Sep 19, 2026	5,001-10,000	193 contacts →
	Indirect evidence “Renamed Vivint, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
24	First Alarm	Partial evidence	Aptos, CA, United StatesHQ checked Sep 19, 2026	201-500	178 contacts →
	Partial evidence “First Alarm has been protecting businesses and homeowners for more than 55 years.” Source: RevenueBase Database · checked Sep 19, 2026
25	American Alarm And Communications, INC	Partial evidence	Arlington, MA, United StatesHQ checked Sep 19, 2026	201-500	159 contacts →
	Partial evidence “We are in the business of protecting people's lives and property, so we understand our customers want and need access to American Alarm's talent and technology around the clock.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: alarm monitoring services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names alarm monitoring services.
Partial evidence: Its own public description names part of alarm monitoring services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name alarm monitoring services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 2,014 alarm monitoring services based in the United States

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Alarm monitoring services based in the United States at a glance

As of Sep 19, 2026

24.6%Verified-email coverage

17.0Average contacts per company

11-50Median size (employees)

1.5%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

932

11-50

770

51-200

225

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 2,014 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 alarm monitoring services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, 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 “alarm monitoring services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names alarm monitoring services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among alarm monitoring services, 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 its RevenueBase Smart Search 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, 8,440 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 19, 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.

Alarm monitoring services by metro

Alarm monitoring services in Houston30
Alarm monitoring services in New York26

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names alarm monitoring services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many alarm monitoring services are there based in the United States?

RevenueBase identified 2,014 alarm monitoring services 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?

Everon, headquartered in Irving, tops this list with the largest team on record.

Which city has the most alarm monitoring services?

Houston leads with 30 headquartered companies, followed by New York (26) and Miami (20).

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 8,440 verified decision-maker contacts tracked across these 2,014 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 19, 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 Smart Search, 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.