Top 5 Medical Laboratory Companies in the USA
Quest Diagnostics, LabCorp, and Any Lab Test Now rank among the largest medical laboratory companies in United States in 2026 by number of locations. Quest Diagnostics operates 4,642 locations, while LabCorp and Any Lab Test Now operate 3,268 and 25 locations respectively. See the full ranking of the top 5 medical laboratory companies and compare store counts across the industry.
Complete dataset of 4,642 Quest Diagnostics store locations across the United States, including address, phone, hours and geocodes.
4,642locationsComplete dataset of 3,268 LabCorp store locations across the United States, including address, phone, hours and geocodes.
3,268locationsComplete dataset of 25 Any Lab Test Now store locations across the United States, including address, phone, hours and geocodes.
25locations$60View — $50
