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.

  1. Quest Diagnostics
    1

    Quest Diagnostics

    questdiagnostics.com

    Complete dataset of 4,642 Quest Diagnostics store locations across the United States, including address, phone, hours and geocodes.

    4,642
    locations
    View — $85
    Quest Diagnostics Laboratory Locations in the USA
    Quest Diagnostics locations map preview — 4,642 records
  2. LabCorp
    2

    LabCorp

    labcorp.com

    Complete dataset of 3,268 LabCorp store locations across the United States, including address, phone, hours and geocodes.

    3,268
    locations
    View — $85
    LabCorp Locations in the USA
    LabCorp locations map preview — 3,268 records
  3. Any Lab Test Now
    3

    Any Lab Test Now

    anylabtestnow.com

    Complete dataset of 25 Any Lab Test Now store locations across the United States, including address, phone, hours and geocodes.

    25
    locations
    $60View — $50
    Any Lab Test Now Laboratory Locations in USA
    Any Lab Test Now locations map preview — 25 records