> Enrich.chat gives AI agents verified work emails and mobiles. To use it from an agent, read https://enrich.chat/agents.md . This is the Markdown version of https://enrich.chat/naics/621511/ # NAICS code 621511: Medical Laboratories The companies classified under NAICS 621511, where they are based, how big they are and how the code maps to SIC. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** NAICS 621511 is the code for Medical Laboratories, in sector 62: Health Care and Social Assistance. The companies counted under it are mostly small: 66% have 200 or fewer employees, and 66% are headquartered in the United States. ## What is NAICS 621511? NAICS 621511 is the code for Medical Laboratories. It belongs to sector 62: Health Care and Social Assistance. NAICS, the North American Industry Classification System, is the standard U.S. government agencies use to sort businesses by what they mainly do, and each digit narrows the category. Most of the companies counted also carry SIC 8071, Medical laboratory, in the older SIC system (84%). NAICS is a North American system, so companies outside the US, Canada and Mexico are placed in it by classification. - 36% of the companies counted have 50 or fewer employees, and the middle one is in the 51 to 200 range. - The largest group is headquartered in the United States (66%). Within the US, California is the biggest state (19%). - Most were founded in the 2010s (38%), then the 2000s (29%). **Figure: How NAICS 621511 is built.** The code 621511 split into its parts: sector 62, then subsector, industry group, NAICS industry and U.S. industry. *The six digits of NAICS 621511. Each digit narrows the category.* ## Which companies are classified under NAICS 621511? The biggest by headcount range include Labcorp, Quest Diagnostics, Alberta Health Services, Wockhardt Hospitals and Kailash Healthcare. Names link to a company profile where we have one. | Company | Headquarters | Employees | | --- | --- | --- | | [Labcorp](https://enrich.chat/company/labcorp/) | Burlington, NC | 10,001+ | | [Quest Diagnostics](https://enrich.chat/company/quest-diagnostics/) | Secaucus, NJ | 10,001+ | | [Alberta Health Services](https://enrich.chat/company/alberta-health-services/) | Edmonton, Canada | 10,001+ | | Wockhardt Hospitals | Bandra East. Mumbai, India | 10,001+ | | Kailash Healthcare | Noida, India | 10,001+ | | Sonic Healthcare | Sydney, Australia | 10,001+ | | Natera | Austin, TX | 5,001 to 10,000 | | Exact Sciences | Madison, WI | 5,001 to 10,000 | | Lancet Laboratories | Johannesburg, South Africa | 5,001 to 10,000 | | Saudi German Hospital | Al Madinah, Saudi Arabia | 5,001 to 10,000 | | [Healius](https://enrich.chat/company/healius/) | Sydney, Australia | 5,001 to 10,000 | | Dr Lal Pathlabs | Gurgaon, India | 1,001 to 5,000 | | Invitae | San Francisco, CA | 1,001 to 5,000 | | Foundation Medicine | Boston, MA | 1,001 to 5,000 | | Thyrocare Technologies | Navi Mumbai, India | 1,001 to 5,000 | | Synlab Italia | Monza (mb), Italy | 1,001 to 5,000 | | Genedx | Stamford, CT | 1,001 to 5,000 | | Pt Prodia Widyahusada Tbk | Jakarta Pusat, Indonesia | 1,001 to 5,000 | | Dar Al Shifa Hospital | Hawalli, Kuwait | 1,001 to 5,000 | | Dynacare | Brampton, Canada | 1,001 to 5,000 | | Corza Medical | Boulder, CO | 1,001 to 5,000 | | Lifenet Health | Virginia Beach, VA | 1,001 to 5,000 | | Apollo Home Healthcare | Hyderabad, India | 1,001 to 5,000 | | Australian Clinical Labs | Clayton, Australia | 1,001 to 5,000 | | Bianalisi | Carate Brianza, Italy | 1,001 to 5,000 | The table shows the 25 biggest by headcount range, with ties broken by audience size. The charts and percentages below cover every company counted for this page, not just these 25, and companies with fewer than 11 employees are not counted. Headquarters is the location on each company's public profile. ## Where are NAICS 621511 companies based? The largest groups are headquartered in the United States (66%), India (9%) and Italy (3%). **Figure: Where companies in NAICS 621511 are based.** Bars for the share of counted companies in NAICS 621511 headquartered in each country: United States 66%, India 9%, Italy 3%, Canada 3%, Australia 2%, France 2%, Switzerland 2%, Belgium 2%. *Share of counted companies in NAICS 621511 by headquarters country.* Within the United States, California (19%), Texas (11%) and Florida (6%) lead. **Figure: US headquarters of companies in NAICS 621511, by state.** A tile map of the United States shaded by the share of counted US companies in NAICS 621511 headquartered in each state. The largest are California 19%, Texas 11%, Florida 6%. *Share of counted US companies in NAICS 621511 by headquarters state. The three largest states are outlined.* ## How big are the companies counted for NAICS 621511? 36% of them have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. **Figure: Size of companies in NAICS 621511.** Seven columns for the share of counted companies in NAICS 621511 in each employee range: 11 to 50 36%, 51 to 200 30%, 201 to 500 15%, 501 to 1,000 9%, 1,001 to 5,000 6%, 5,001 to 10,000 1%, 10,001+ 2%. *Share of counted companies in NAICS 621511 in each employee range.* ## How old are NAICS 621511 companies? Most were founded in the 2010s (38%), then the 2000s (29%). **Figure: When companies in NAICS 621511 were founded.** Eight columns for the share of counted companies in NAICS 621511 founded in each era: Before 1960 3%, 1960s 2%, 1970s 6%, 1980s 5%, 1990s 11%, 2000s 29%, 2010s 38%, 2020s 7%. *Share of counted companies in NAICS 621511 by the era they were founded in, for the ones that list a founding year.* ## How NAICS 621511 compares - 36% of companies in NAICS 621511 have 50 or fewer employees, against 60% across all NAICS codes on this site. - 44% were founded in 2010 or later, against 30% across all NAICS codes on this site. - California holds 19% of the US companies here, against 14% across all NAICS codes on this site. ## How do NAICS 621511 companies describe themselves? A code is assigned by classification, and a company does not choose its own, so the label a company uses for itself can differ. The most common labels here are Hospitals and Health Care (45%), Biotechnology Research (19%) and Medical Practices (9%). **Figure: How companies in NAICS 621511 describe themselves.** Bars for the share of counted companies in NAICS 621511 that give each industry on their public profile: Hospitals and Health Care 45%, Biotechnology Research 19%, Medical Practices 9%, Medical and Diagnostic Laboratories 7%, Biotechnology 4%, Medical Equipment Manufacturing 4%. *Share of counted companies in NAICS 621511 by the industry they list on their public profile.* ## NAICS 621511 and the SIC system NAICS replaced SIC in 1997, but the two do not line up one to one: companies filed under one NAICS code can carry several SIC codes. These are the ones seen most. | Code | Title | Share of counted | | --- | --- | --- | | SIC 8071 | Medical laboratory | 84% | | SIC 8731 | Commercial physical research | 3% | | [SIC 8011](https://enrich.chat/naics/621111/) | Medical doctor's office | 3% | | [SIC 8099](https://enrich.chat/naics/621999/) | Health and allied services | 2% | ## Where NAICS codes come from NAICS is maintained by the U.S. Census Bureau with Canada and Mexico and revised every five years; the current edition is NAICS 2022. To check exactly what a code includes, search the [official NAICS index](https://www.census.gov/naics/) or read the Census Bureau's [guide to understanding NAICS](https://www.census.gov/programs-surveys/economic-census/year/2022/guidance/understanding-naics.html). Pick a code by what a company mostly does, not by who it sells to. ## How do you reach the people at NAICS 621511 companies? The people to talk to are usually operations, IT and finance leaders. You can build the list from this code in three prompts to your AI agent. ### 1. Count them (free) Counting who matches never uses credits. ```text Use www.enrich.chat to count the companies with NAICS code 621511 (Medical Laboratories) ``` ### 2. Find the people (5 credits per person) Name the roles you sell to. Each person returned is 5 credits, and name, title and company are included. ```text Use www.enrich.chat to find the operations, IT and finance leaders at companies with NAICS code 621511, with their titles ``` ### 3. Get their work emails (10 credits each) An email is 10 credits only when one is found. Every email comes with a status: verified, catch-all or unknown. ```text Use www.enrich.chat to find the work emails for these people and tell me which ones are verified ``` ## More to explore Codes next to it: [NAICS 621512: Diagnostic Imaging Centers](https://enrich.chat/naics/621512/) Others in sector 62: [NAICS 621111: Offices of Physicians](https://enrich.chat/naics/621111/)[NAICS 621999: All Other Miscellaneous Ambulatory Health](https://enrich.chat/naics/621999/)[NAICS 621210: Offices of Dentists](https://enrich.chat/naics/621210/)[NAICS 621610: Home Health Care Services](https://enrich.chat/naics/621610/)[NAICS 621498: All Other Outpatient Care Centers](https://enrich.chat/naics/621498/)[NAICS 622110: General Medical and Surgical Hospitals](https://enrich.chat/naics/622110/)[NAICS 621340: Offices of Physical, Occupational and Speech](https://enrich.chat/naics/621340/)[NAICS 623990: Other Residential Care Facilities](https://enrich.chat/naics/623990/) ## Frequently asked questions ### What is NAICS code 621511? NAICS 621511 is the code for Medical Laboratories, in sector 62: Health Care and Social Assistance. ### What is the SIC code for NAICS 621511 (Medical Laboratories)? 84% of the companies counted carry SIC 8071 (Medical laboratory), but the two systems do not map one to one. ### Which companies are classified under NAICS 621511? The biggest by headcount range include Labcorp, Quest Diagnostics, Alberta Health Services, Wockhardt Hospitals and Kailash Healthcare. The page lists 25 with links to their profiles where we have them. ### Where are NAICS 621511 companies based? The largest groups are headquartered in the United States (66%), India (9%) and Italy (3%). ### How big are the companies in NAICS 621511? 36% have 50 or fewer employees, and the middle one is in the 51 to 200 range. Companies with fewer than 11 employees are not counted. ### Is NAICS 621511 the same as a SIC code? No. NAICS replaced SIC as the U.S. federal standard in 1997, and the two do not map one to one. The SIC code seen most among these companies is 8071. ## Try this prompt Find the people at NAICS 621511 companies ```text Use www.enrich.chat to find the operations, IT and finance leaders at companies with NAICS code 621511, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 621512](https://enrich.chat/naics/621512/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)