Illinois Number of Private Business Establishments in the NAICS 561621 Security systems services, except locksmiths Industry By County in 2025 Q3 (QCEW)

Updated on April 2, 2026.

According to data from the US Bureau of Labor Statistics, in 2025 Q3, Illinois had 298 number of private business establishments in the NAICS 561621 Security systems services, except locksmiths Industry. Among all Illinois counties, Cook had the highest number of private business establishments (86), followed by DuPage (26), and Will (21).

The chart and table shows the number of business establishments for each county.

You can see similar information for other states, and for the United States.

You can see similar information for other industries.

Related Topics: Illinois BLS Topic List.

Data Source: US Bureau of Labor Statistics (QCEW).

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Illinois Number of Private Business Establishments in the NAICS 561621 Security systems services, except locksmiths Industry By County in 2025 Q3

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County	Number of Business Establishments
Christian	2
Coles	2
Cook	86
Cumberland	1
DeKalb	1
DuPage	26
Effingham	2
Jackson	1
Jefferson	1
Kane	13
Kankakee	3
Kendall	1
Lake	14
Livingston	1
McHenry	7
McLean	1
Madison	5
Mason	1
Monroe	1
Peoria	7
Rock Island	4
St. Clair	1
Sangamon	4
Tazewell	6
Vermilion	1
Will	21
Winnebago	6