Maryland Number of Private Business Establishments in the NAICS 541380 Testing laboratories 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, Maryland had 176 number of private business establishments in the NAICS 541380 Testing laboratories Industry. Among all Maryland counties, Montgomery had the highest number of private business establishments (24), followed by Baltimore (20), and Howard (17).

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: Maryland BLS Topic List.

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

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Maryland Number of Private Business Establishments in the NAICS 541380 Testing laboratories Industry By County in 2025 Q3

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County	Number of Business Establishments
Allegany	2
Anne Arundel	16
Baltimore	20
Calvert	1
Carroll	2
Cecil	2
Charles	1
Frederick	12
Harford	10
Howard	17
Kent	1
Montgomery	24
Prince George's	13
Queen Anne's	2
St. Mary's	1
Talbot	1
Washington	2
Baltimore city	11