Top 5 laboratories in the United States in 2025

What is the largest laboratory in the United States?

What are the largest laboratories in the United States in 2025?

Quest Diagnostics, LabCorp and Ascension Health Imaging are the largest laboratories in the United States in 2025 based on the number of locations. Quest Diagnostics has the most number of locations with 6,185 locations across 52 states and territories. LabCorp has 2,295 and Ascension Health Imaging has 345 locations in the US. These three together make 93.24% of the largest 10 laboratories in the US.

Rank	Brand		Number of Locations	States Present In	Cities Present In	Download Dataset
#1		Quest Diagnostics	6,185	52	2,584	Download
#2		LabCorp	2,295	48	1,352	Download
#3		Ascension Health Imaging	345	12	144	Download
#4		Any Lab Test Now	238	32	207	Download
#5		Ascension Health Laboratory	197	12	106	Download

Disclaimer: Brand logos are used for visual representation only and do not imply endorsement or affiliation.

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Quest Diagnostics

There are 6,185 Quest Diagnostics clinics in the United States as of December 01, 2025. The state and territory with the most number of Quest Diagnostics locations in the US is Texas, with 689 clinics, which is about 11% of all Quest Diagnostics clinics in the US.

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LabCorp

There are 2,295 LabCorp locations in the United States as of December 02, 2025. The state and territory with the most number of LabCorp locations in the US is California, with 348 locations, which is about 15% of all LabCorp locations in the US.

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Ascension Health Imaging

There are 345 Ascension Health Imaging clinics in the United States as of October 24, 2023. The state and territory with the most number of Ascension Health Imaging locations in the US is Michigan, with 101 clinics, which is about 29% of all Ascension Health Imaging clinics in the US.

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Any Lab Test Now

There are 238 Any Lab Test Now locations in the United States as of May 02, 2024. The state and territory with the most number of Any Lab Test Now locations in the US is Texas, with 69 locations, which is about 29% of all Any Lab Test Now locations in the US.

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Ascension Health Laboratory

There are 197 Ascension Health Laboratory locations in the United States as of September 26, 2023. The state and territory with the most number of Ascension Health Laboratory locations in the US is Michigan, with 87 locations, which is about 44% of all Ascension Health Laboratory locations in the US.

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Note: To ensure accurate industry categorization, we utilize NAICS codes, which classify businesses by their main economic activity. As a result, companies may appear in different industry location reports based on their primary NAICS classification. For instance, Walmart is classified as a department store under NAICS.