Illinois Number of Private Business Establishments in the NAICS 541380 Testing laboratories Industry By County in 2025 Q1 (QCEW)

Updated on April 2, 2026.

According to data from the US Bureau of Labor Statistics, in 2025 Q1, Illinois had 407 number of private business establishments in the NAICS 541380 Testing laboratories Industry. Among all Illinois counties, Cook had the highest number of private business establishments (104), followed by DuPage (50), and Lake (28).

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 541380 Testing laboratories Industry By County in 2025 Q1

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County	Number of Business Establishments
Champaign	10
Coles	1
Cook	104
Crawford	2
DeKalb	2
DuPage	50
Franklin	2
Henderson	1
Henry	2
Jefferson	2
Jersey	1
Kane	15
Kankakee	1
Lake	28
LaSalle	4
Livingston	4
McHenry	6
McLean	4
Macon	3
Madison	5
Marion	2
Menard	1
Peoria	6
Piatt	1
Pike	1
St. Clair	6
Saline	1
Sangamon	5
Shelby	2
Stark	1
Tazewell	2
Vermilion	2
Wabash	1
Wayne	1
Whiteside	1
Will	18
Williamson	2
Winnebago	5