Company lists · Data refreshed September 2026

Top 25 Access control system contractors based in the United States

Name: Access control system contractors based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 1,976 companies tracked

RevenueBase identified 1,976 access control system contractors headquartered in the United States as of September 2026 and tracks 27,731 professional contacts across them, including 8,301 with verified work emails. New York is the largest hub.

This list covers access control system 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 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 30, 2026 86% judged on-target in blind review

1,976Companies

27,731Contacts tracked

8,301Verified emails

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The 25 largest access control system contractors based in the United States

Ranked by team size

Top 25 of 1,976 access control system contractors based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to access control system contractors: 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	Automated Systems Design, INC	Partial evidence	Alpharetta, GA, United StatesHQ checked Sep 30, 2026	n/a	2,678 contacts →
	Partial evidence “Since 1987, Automated Systems Design, Inc.(ASD®) a five-time Inc.” Source: RevenueBase Database · checked Sep 30, 2026
2	Security 101	Partial evidence	West Palm Beach, FL, United StatesHQ checked Sep 30, 2026	501-1,000	849 contacts →
	Partial evidence “Security 101® is a nationwide leader in designing, installing, and maintaining advanced security systems tailored to the unique needs of organizations of all sizes.” Source: RevenueBase Database · checked Sep 30, 2026
3	Assa Abloy Opening Solutions Americas	Partial evidence	New Haven, CT, United StatesHQ checked Sep 30, 2026	10001+	506 contacts →
	Partial evidence “ASSA ABLOY Opening Solutions Americas provides a complete range of door opening products for access solutions in homes, businesses, and institutions.” Source: RevenueBase Database · checked Sep 30, 2026
4	The Cook & Boardman Group, LLC	Indirect evidence	Winston-Salem, NC, United StatesHQ checked Sep 30, 2026	1,001-5,000	445 contacts →
	Indirect evidence “Established in 1955, The Cook & Boardman Group is the nation’s premier provider of architectural doors and frames, door hardware and related building specialty products in…” Source: RevenueBase Database · checked Sep 30, 2026
5	Napco Security Technologies	Indirect evidence	Amityville, NY, United StatesHQ checked Sep 30, 2026	501-1,000	427 contacts →
	Indirect evidence “NAPCO Security Technologies (NASDAQ: NSSC) is one of the world's leading manufacturers of technologically advanced electronic security equipment including intrusion and fire alarm…” Source: RevenueBase Database · checked Sep 30, 2026
6	AFA Protective Systems, INC	Indirect evidence	Syosset, NY, United StatesHQ checked Sep 30, 2026	201-500	302 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
7	Wittenbach	Indirect evidence	Sparks, MD, United StatesHQ checked Sep 30, 2026	201-500	244 contacts →
	Indirect evidence “For over 50 years, Wittenbach has been a trusted leader in advanced security solutions in financial and commercial industries.” Source: RevenueBase Database · checked Sep 30, 2026
8	NAVCO	Partial evidence	Orange, CA, United StatesHQ checked Sep 30, 2026	51-200	232 contacts →
	Partial evidence “One of the largest privately held national electronic security system integrator in the USA, NAVCO keeps you one step ahead of ever-changing technology.” Source: RevenueBase Database · checked Sep 30, 2026
9	Alarm Detection Systems	Partial evidence	Aurora, IL, United StatesHQ checked Sep 30, 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 30, 2026
10	Datawatch Systems	Strong evidence	Bethesda, MD, United StatesHQ checked Sep 30, 2026	201-500	206 contacts →
	Strong evidence “An industry leader in managed access control security solutions and services since 1981, Datawatch Systems is trusted by building owners, property managers, and tenants across the…” Source: RevenueBase Database · checked Sep 30, 2026
11	Convergint Technologies	Strong evidence	Atlanta, United StatesHQ checked Sep 30, 2026	5,001-10,000	202 contacts →
	Strong evidence “Electronic Security Integrator Access Control Closed Circuit Television Intercom” Source: RevenueBase Database · checked Sep 30, 2026
12	Stone Security, A Bearcom Company	Strong evidence	Salt Lake City, UT, United StatesHQ checked Sep 30, 2026	201-500	202 contacts →
	Strong evidence “Stone Security has been driving the implementation of network-based surveillance, access control and intrusion systems for over 15 years.” Source: RevenueBase Database · checked Sep 30, 2026
13	GIL Korta	Indirect evidence	Boca Raton, FL, United StatesHQ checked Sep 30, 2026	1,001-5,000	192 contacts →
	Indirect evidence “At Red Hawk Fire & Security, we install, test and inspect, integrate, service and monitor a comprehensive range of advanced technologies custom designed for your specific business…” Source: RevenueBase Database · checked Sep 30, 2026
14	Amag Technology	Strong evidence	Hawthorne, CA, United StatesHQ checked Sep 30, 2026	201-500	177 contacts →
	Strong evidence “AMAG Technology is a market leader in Physical Access Control, Identity Management and integrated security solutions.” Source: RevenueBase Database · checked Sep 30, 2026
15	Aegis Protective Services	Indirect evidence	Cincinnati, OH, United StatesHQ checked Sep 30, 2026	201-500	165 contacts →
	Indirect evidence “Security Guard and Technology Services.” Source: RevenueBase Database · checked Sep 30, 2026
16	General Security	Indirect evidence	Plainview, NY, United StatesHQ checked Sep 30, 2026	51-200	159 contacts →
	Indirect evidence “General Security is a family owned and operated company with offices from Buffalo, NY to South East Florida.” Source: RevenueBase Database · checked Sep 30, 2026
17	Sentry Security	Partial evidence	Wheeling, IL, United StatesHQ checked Sep 30, 2026	n/a	159 contacts →
	Partial evidence “Comprehensive, cutting-edge integrated security systems to protect your people, business and assets for years to come.” Source: RevenueBase Database · checked Sep 30, 2026
18	Vicon Industries	Partial evidence	Hauppauge, NY, United StatesHQ checked Sep 30, 2026	51-200	156 contacts →
	Partial evidence “Since 1967, Vicon has been a leading provider of mission-critical security surveillance systems.” Source: RevenueBase Database · checked Sep 30, 2026
19	OLD Account	Indirect evidence	Hammond, LA, United StatesHQ checked Sep 30, 2026	n/a	156 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
20	Safe Home Security, INC	Partial evidence	Middletown, CT, United StatesHQ checked Sep 30, 2026	201-500	148 contacts →
	Partial evidence “Installation and monitoring of commercial and residential security systems.” Source: RevenueBase Database · checked Sep 30, 2026
21	Comtel Systems Technology, INC	Partial evidence	Sunnyvale, CA, United StatesHQ checked Sep 30, 2026	51-200	145 contacts →
	Partial evidence “Comtel is a full service systems integrator providing communications and security systems to the Commercial, Healthcare and Education markets since 1982.” Source: RevenueBase Database · checked Sep 30, 2026
22	VTI Security	Indirect evidence	Burnsville, MN, United StatesHQ checked Sep 30, 2026	1,001-5,000	143 contacts →
	Indirect evidence “For almost 40 years, VTI has been called upon and recognized by our industry for a full range of advanced physical security technologies.” Source: RevenueBase Database · checked Sep 30, 2026
23	EPS Security	Indirect evidence	Grand Rapids, MI, United StatesHQ checked Sep 30, 2026	201-500	140 contacts →
	Indirect evidence “A home and business security provider, EPS Security was founded in Grand Rapids, Michigan.” Source: RevenueBase Database · checked Sep 30, 2026
24	Bulldog Security Services, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	201-500	128 contacts →
	Indirect evidence “Bulldog Security Services is a family-owned national ADT Authorized Dealer with over a decade of industry experience.” Source: RevenueBase Database · checked Sep 30, 2026
25	Controlled Products Systems Group	Strong evidence	Denver, CO, United StatesHQ checked Sep 30, 2026	51-200	127 contacts →
	Strong evidence “Controlled Products is the largest wholesale distributor of perimeter access control equipment in the U.S.” Source: RevenueBase Database · checked Sep 30, 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: access control system contractors. 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 access control system contractors.
Partial evidence: Its own public description names part of access control system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name access control system contractors. 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 1,976 access control system contractors based in the United States

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Access control system contractors based in the United States at a glance

As of Sep 30, 2026

29.9%Verified-email coverage

14.0Average contacts per company

11-50Median size (employees)

2.0%Largest-city concentration · New York

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

925

11-50

805

51-200

196

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 1,976 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 access control system contractors, 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 “access control system contractors”. 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 access control system contractors), 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 access control system 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 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, 8,301 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 30, 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.

Access control system contractors by metro

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 access control system contractors, 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 access control system contractors are there based in the United States?

RevenueBase identified 1,976 access control system 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?

Automated Systems Design, INC, headquartered in Alpharetta, tops this list with the largest team on record.

Which city has the most access control system contractors?

New York leads with 40 headquartered companies, followed by Houston (36) and Miami (25).

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 8,301 verified decision-maker contacts tracked across these 1,976 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 30, 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.