> 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/621111/massachusetts/ # NAICS 621111 companies in Massachusetts Companies with NAICS code 621111 (Offices of Physicians (Except Mental Health Specialists)) headquartered in Massachusetts, with their cities, sizes and SIC codes. By Enrich.chat Editorial. Updated October 22, 2026. **Short answer:** The biggest NAICS 621111 companies in Massachusetts by headcount range include Atrius Health, Devoted Health and Reliant Medical Group. NAICS 621111 is the code for Offices of Physicians (Except Mental Health Specialists). Among those counted, they are mostly very small: 62% have 50 or fewer employees. ## Which NAICS 621111 companies are in Massachusetts? The biggest by headcount range include Atrius Health, Devoted Health, Reliant Medical Group, Thrive Skilled Pediatric Care and Hawthorn Medical Associates. NAICS 621111 is the code for Offices of Physicians (Except Mental Health Specialists). Names link to a company profile where we have one. | Company | City | Employees | | --- | --- | --- | | Atrius Health | Newton | 5,001 to 10,000 | | Devoted Health | Waltham | 1,001 to 5,000 | | Reliant Medical Group | Worcester | 1,001 to 5,000 | | Thrive Skilled Pediatric Care | Wakefield | 1,001 to 5,000 | | Hawthorn Medical Associates | Dartmouth | 501 to 1,000 | | Eleanor Health | Worcester | 201 to 500 | | Boston Ivf | Waltham | 201 to 500 | | Codman Square Health Center | Dorchester | 201 to 500 | | Manet Community Health Center | North Quincy | 201 to 500 | | Acton Medical Associates | Acton | 201 to 500 | | Caring Health Center | Springfield | 201 to 500 | | Charles River Medical Associates | Framingham | 201 to 500 | | Skincare Physicians | Chestnut Hill | 51 to 200 | | Outer Cape Health Services | Harwich Port | 51 to 200 | | Boston Orthopaedic & Spine | Cambridge | 51 to 200 | | Premier Diagnostic Services | Avon | 51 to 200 | | New Horizons Medical | Framingham | 51 to 200 | | Pediatrics West | Westford | 51 to 200 | | Harvard Street Neighborhood Health Center | Dorchester | 51 to 200 | | Mass Lung & Allergy, Pc | Leominster | 51 to 200 | | Dermatology Partners | Wellesley | 51 to 200 | | Springfield Medical Associates | Springfield | 51 to 200 | | Urology Consultants Of The North Shore | Salem | 51 to 200 | | Same Day Surgicare Of New England | Fall River | 51 to 200 | | Fertility Solutions | Dedham | 11 to 50 | 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. ## Which cities in Massachusetts? Within Massachusetts, Springfield (8%), Boston (5%) and Dorchester (5%) are the most common headquarters. **Figure: Cities of NAICS 621111 companies in Massachusetts.** Bars for the share of counted NAICS 621111 companies in Massachusetts headquartered in each city: Springfield 8%, Boston 5%, Dorchester 5%, Framingham 5%, Lowell 5%, Waltham 5%, Worcester 5%. *Share of counted NAICS 621111 companies in Massachusetts by headquarters city.* ## How big are they? 62% of the NAICS 621111 companies counted in Massachusetts have 50 or fewer employees, and the middle one is in the 11 to 50 range. Companies with fewer than 11 employees are not counted. **Figure: Size of NAICS 621111 companies in Massachusetts.** Seven columns for the share of counted NAICS 621111 companies in Massachusetts in each employee range: 11 to 50 62%, 51 to 200 19%, 201 to 500 11%, 501 to 1,000 2%, 1,001 to 5,000 5%, 5,001 to 10,000 2%, 10,001+ 0%. *Share of counted NAICS 621111 companies in Massachusetts in each employee range.* ## How do you reach the people at these Massachusetts companies? The people to talk to are usually operations, IT and finance leaders. Build the list 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 621111 in Massachusetts ``` ### 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 621111 in Massachusetts, 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 About the code: [NAICS 621111: Offices of Physicians (Except Mental Health Specialists)](https://enrich.chat/naics/621111/). About the place: [companies in Massachusetts](https://enrich.chat/companies-in/massachusetts/). NAICS 621111 in other states: [Texas](https://enrich.chat/naics/621111/texas/)[California](https://enrich.chat/naics/621111/california/)[Florida](https://enrich.chat/naics/621111/florida/)[New York](https://enrich.chat/naics/621111/new-york/)[Georgia](https://enrich.chat/naics/621111/georgia/)[Illinois](https://enrich.chat/naics/621111/illinois/)[Tennessee](https://enrich.chat/naics/621111/tennessee/)[New Jersey](https://enrich.chat/naics/621111/new-jersey/)[Ohio](https://enrich.chat/naics/621111/ohio/)[Arizona](https://enrich.chat/naics/621111/arizona/) Other NAICS codes in Massachusetts: [NAICS 541511: Custom Computer Programming Services](https://enrich.chat/naics/541511/massachusetts/)[NAICS 722511: Full-Service Restaurants](https://enrich.chat/naics/722511/massachusetts/)[NAICS 531210: Offices of Real Estate Agents](https://enrich.chat/naics/531210/massachusetts/)[NAICS 541512: Computer Systems Design Services](https://enrich.chat/naics/541512/massachusetts/)[NAICS 541714: Research and Development](https://enrich.chat/naics/541714/massachusetts/)[NAICS 513210: Software Publishers](https://enrich.chat/naics/513210/massachusetts/)[NAICS 523940: Portfolio Management and Investment](https://enrich.chat/naics/523940/massachusetts/)[NAICS 236220: Commercial and Institutional Building](https://enrich.chat/naics/236220/massachusetts/) ## Frequently asked questions ### Which NAICS 621111 companies are in Massachusetts? The biggest by headcount range include Atrius Health, Devoted Health, Reliant Medical Group, Thrive Skilled Pediatric Care and Hawthorn Medical Associates. The page lists 25 with links to their profiles where we have them. ### What is NAICS 621111? NAICS 621111 is the code for Offices of Physicians (Except Mental Health Specialists), in sector 62: Health Care and Social Assistance. ### Which cities in Massachusetts have the most? Springfield (8%), Boston (5%) and Dorchester (5%) lead among the companies counted. ## Try this prompt Find the people at NAICS 621111 companies in Massachusetts ```text Use www.enrich.chat to find the operations, IT and finance leaders at companies with NAICS code 621111 in Massachusetts, with titles and verified work emails ``` ## Related - [Companies using a technology](https://enrich.chat/companies-using/) - [NAICS 621111 in Texas](https://enrich.chat/naics/621111/texas/) - [NAICS 621111 in California](https://enrich.chat/naics/621111/california/) - [NAICS 621111 in Florida](https://enrich.chat/naics/621111/florida/) - [NAICS 621111 in New York](https://enrich.chat/naics/621111/new-york/) - [NAICS 541511 in Massachusetts](https://enrich.chat/naics/541511/massachusetts/) - [NAICS 722511 in Massachusetts](https://enrich.chat/naics/722511/massachusetts/) - [NAICS 531210 in Massachusetts](https://enrich.chat/naics/531210/massachusetts/) - [NAICS 541512 in Massachusetts](https://enrich.chat/naics/541512/massachusetts/) - [Tech stack lookup](https://enrich.chat/tools/tech-stack-lookup/)