| MISSISSIPPI GAS TRANSPORTATION COMPANY, INC. | — | 103933 | 1981-05-22 | Dissolved | Madison |
| MISSISSIPPI GET QUICK, INC. | — | 439642 | 1981-03-05 | Dissolved | |
| MISSISSIPPI GULF COAST MULTIPLE LISTING SERVICE, INC. | — | 501777 | 1981-12-18 | Active | Gulfport |
| MISSISSIPPI HEALTH FACILITIES ASSOCIATION, INC. | — | 103997 | 1981-02-11 | | MERIDIAN |
| MISSISSIPPI HOMES FOR THE ELDERLY AND HANDICAPPED, INC. | — | 104023 | 1981-05-11 | Active | CORINTH |
| MISSISSIPPI HUNTER-JUMPER ASSOCIATION, INC. | Educational services | 104039 | 1981-07-13 | Active | Ridgeland |
| MISSISSIPPI INSURERS AGENCY, INC. | — | 104077 | 1981-04-09 | Dissolved | JACKSON |
| MISSISSIPPI KARATE ASSOCIATION, INC. | — | 104092 | 1981-02-16 | Active | JACKSON |
| MISSISSIPPI MESSENGER, INC. | — | 501780 | 1981-12-22 | Active | JACKSON |
| MISSISSIPPI MINING & MARKETING COMPANY | — | 104177 | 1981-02-19 | Dissolved | MAGNOLIA |
| MISSISSIPPI MINORITY SUPPLIER DEVELOPMENT COUNCIL, INC. | — | 104179 | 1981-10-09 | Active | JACKSON |
| MISSISSIPPI OFFSHORE EMPLOYMENT AGENCY, INC. | — | 501781 | 1981-11-30 | Dissolved | |
| MISSISSIPPI ORGANIZATION OF REALTY EXCHANGORS, INC. | — | 104257 | 1981-10-19 | Active | NEW ALBANY |
| MISSISSIPPI ORGANIZATION OF REALTY EXCHANGORS, INC. | — | 501782 | 1981-10-19 | Active | NEW ALBANY |
| MISSISSIPPI OUTDOOR ADVERTISING, INC. | — | 104259 | 1981-06-03 | Dissolved | |
| MISSISSIPPI PRESBYTERIAN RETIREMENT CENTER, INC. | — | 104299 | 1981-03-27 | Active | CANTON |
| MISSISSIPPI PROFESSIONAL TREE SURGEONS' ASSOCIATION, INC. | — | 104311 | 1981-09-29 | | JACKSON |
| MISSISSIPPI PUBLISHERS CORPORATION | — | 501784 | 1981-12-18 | Merged | |
| MISSISSIPPI PUPPETRY GUILD, INC. | — | 104318 | 1981-10-19 | Active | Jackson |
| MISSISSIPPI RENTAL INC. | — | 104344 | 1981-08-21 | | LAUREL |
| MISSISSIPPI RENTAL TOOLS, INC. | — | 104345 | 1981-07-01 | Dissolved | |
| MISSISSIPPI RIGHT OF WAY PROCUREMENT CORPORATION | — | 104364 | 1981-08-14 | Dissolved | |
| MISSISSIPPI RIVER CONSULTANTS, INC. | — | 104366 | 1981-04-22 | Dissolved | GREENVILLE |
| MISSISSIPPI RIVER SERVICES COMPANY, INC. | — | 104369 | 1981-04-22 | Dissolved | |
| MISSISSIPPI SCIENCE NETWORK, INC. | — | 647127 | 1981-01-15 | Dissolved | JACKSON |
| MISSISSIPPI SECURITY AND INVESTIGATIONS, INC. | — | 104400 | 1981-02-04 | Dissolved | |
| MISSISSIPPI SECURITY CONSULTANTS, INC. | — | 104399 | 1981-03-24 | Dissolved | |
| MISSISSIPPI SHELL AND GRAVEL, INC. | — | 104409 | 1981-07-08 | Dissolved | |
| MISSISSIPPI SHERIFF'S ASSOCIATION, INC. | — | 104411 | 1981-10-09 | | COLUMBUS |
| MISSISSIPPI SHERIFFS' ASSOCIATION, INC. | — | 721709 | 1981-10-09 | Active | |
| MISSISSIPPI SOCIETY OF CYTOPATHOLOGY, INC. | — | 104431 | 1981-03-04 | Active | BELDEN |
| MISSISSIPPI SOUND INVESTORS, INC. | — | 104448 | 1981-08-24 | Dissolved | |
| MISSISSIPPI SOUND PROPERTIES, LTD. | — | 508761 | 1981-01-09 | | APALACHICOLA |
| MISSISSIPPI SOUTHERN OIL CORPORATION | — | 104452 | 1981-05-13 | Dissolved | |
| MISSISSIPPI SPECIALTY & SUPPLY, INC. | — | 104455 | 1981-10-01 | Dissolved | |
| MISSISSIPPI STATE FEDERATION OF COLORED WOMEN'S CLUB HOUSING FOR THE ELDERLY IN CLARKSDALE, INC. | — | 104472 | 1981-01-23 | Active | MC COMB |
| MISSISSIPPI STATE FEDERATION OF COLORED WOMEN'S CLUB HOUSING FOR THE ELDERLY IN HATTIESBURG, INC. | — | 104475 | 1981-01-23 | Active | Ridgeland |
| MISSISSIPPI STATE MEDICAL ASSOCIATION ALLIANCE, INC. | Other services | 600093 | 1981-06-19 | Active | JACKSON |
| MISSISSIPPI STATE MEDICAL ASSOCIATION AUXILIARY, INC. | — | 104483 | 1981-06-19 | | JACKSON |
| MISSISSIPPI STOCK DOG ASSOCIATION, INC. | — | 104505 | 1981-09-11 | Active | MERIDIAN |
| MISSISSIPPI TOWING AND RECOVERY PROFESSIONALS, INC. | — | 501354 | 1981-12-02 | Active | Tupelo |
| MISSISSIPPI TRADING COMPANY, LTD. | — | 104557 | 1981-04-22 | Dissolved | |
| MISSISSIPPI VALLEY HEALTH MANAGEMENT, INC. | — | 104590 | 1981-02-12 | Dissolved | |
| MISSISSIPPI VENTURES, INCORPORATED | — | 104603 | 1981-03-18 | Dissolved | |
| MISSISSIPPI WESTERN RETAILERS, INC. | — | 104621 | 1981-06-25 | Merged | |
| MISSISSIPPI WOODWORKS, INC. | — | 206118 | 1981-03-18 | Dissolved | |
| MISSISSIPPI YOUTH CHRISTIAN BAPTIST ASSOCIATION, INC. | — | 501355 | 1981-11-12 | | MAGNOLIA |
| MITCHEL, SCHREIBER, WATTS & CO., INC. | — | 206184 | 1981-02-27 | Merged | Gulfport |
| MITCHELL CONSTRUCTION COMPANY, INC. | — | 501359 | 1981-11-16 | Revoked | VIDALIA |
| MITCHELL ENERGY CORPORATION | — | 206194 | 1981-08-17 | Canceled | Gulfport |