Massachusetts Number of Private Business Establishments in the NAICS 54138 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, Massachusetts had 239 number of private business establishments in the NAICS 54138 Testing laboratories Industry. Among all Massachusetts counties, Middlesex had the highest number of private business establishments (63), followed by Norfolk (27), and Worcester (23).

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: Massachusetts BLS Topic List.

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

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Massachusetts Number of Private Business Establishments in the NAICS 54138 Testing laboratories Industry By County in 2025 Q3

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County	Number of Business Establishments
Barnstable	4
Berkshire	2
Bristol	6
Essex	18
Franklin	2
Hampden	16
Hampshire	3
Middlesex	63
Norfolk	27
Plymouth	10
Suffolk	16
Worcester	23