| MA | MD | ME | MI | MO | MR | MU | MY |
| Index entry | NAICS Code | U.S. NAICS Title |
|---|---|---|
| MDF (medium density fiberboard) manufacturing | 321219 | Reconstituted Wood Product Manufacturing |
| MDs' (medical doctors), mental health, offices (e.g., centers, clinics) | 621112 | Offices of Physicians, Mental Health Specialists |
| MDs' (medical doctors, except mental health) offices (e.g., centers, clinics) | 621111 | Offices of Physicians (except Mental Health Specialists) |
| MA | MD | ME | MI | MO | MR | MU | MY |