| MISSISSIPPI COUNTRY BLUES SOCIETY, INC. | — | 103765 | 1978-08-25 | Active | JACKSON |
| MISSISSIPPI DATA PROCESSING SERVICES, INC. | — | 103781 | 1978-04-05 | Dissolved | |
| MISSISSIPPI DELTA ALUMNI CORPORATION OF SIGMA PHI EPSILON FRATERNITY | — | 103786 | 1978-05-25 | Active | CLEVELAND |
| MISSISSIPPI ELECTRICAL CONTRACTORS ASSOCIATION, INC. | — | 103843 | 1978-06-26 | Active | JACKSON |
| MISSISSIPPI ENERGY & EXPLORATION, INC. | — | 439541 | 1978-08-11 | Dissolved | |
| MISSISSIPPI FAMILY HEALTH CENTER, LTD. | — | 103863 | 1978-10-24 | Dissolved | JACKSON |
| MISSISSIPPI FILING SYSTEMS, INC. | — | 103888 | 1978-08-01 | Dissolved | JACKSON |
| MISSISSIPPI FLEET TIRE SERVICE, INC. | — | 103897 | 1978-11-02 | Dissolved | |
| MISSISSIPPI FOAM FABRICATORS, INC. | — | 103899 | 1978-03-30 | | ECRU |
| MISSISSIPPI FOUNDATION FOR ALCOHOL AND NARCOTICS EDUCATION, INC. | — | 103907 | 1978-11-20 | Dissolved | JACKSON |
| MISSISSIPPI GULF COAST CHAPTER 332 AIR FORCE ASSOCIATION, INC. | — | 103955 | 1978-08-14 | Active | BILOXI |
| MISSISSIPPI GULF COAST CRAFTSMEN'S GUILD | — | 103957 | 1978-01-19 | Active | OCEAN SPRINGS |
| MISSISSIPPI GULF COAST JOGGING CLUB, INC. | — | 103964 | 1978-08-22 | Active | GULFPORT |
| MISSISSIPPI GULF COAST SQUARE DANCE FESTIVAL ASSOCIATION, INC. | — | 103974 | 1978-02-22 | Active | GULFPORT |
| MISSISSIPPI GULF COAST VISITORS BUREAU, INC. | — | 103975 | 1978-08-24 | Dissolved | BILOXI |
| MISSISSIPPI GULF MARINE, INC. | — | 439667 | 1978-04-13 | Dissolved | |
| MISSISSIPPI HEALTH CARE SERVICES OF CLEVELAND, INC. | — | 103986 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF GREENWOOD, INC. | — | 103987 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF GRENADA, INC. | — | 103988 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF INDIANOLA, INC. | — | 103990 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF MCCOMB, INC. | — | 103991 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF MERIDIAN, INC. | — | 103992 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF SENATOBIA, INC. | — | 103993 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF WINONA, INC. | — | 103994 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEALTH CARE SERVICES OF YAZOO CITY, INC. | — | 103995 | 1978-08-04 | Active | JACKSON |
| MISSISSIPPI HEART ASSOCIATION, INC. | — | 104001 | 1978-08-14 | | JACKSON |
| MISSISSIPPI INDUSTRIAL GAS CO., INC. | — | 104058 | 1978-09-20 | | |
| MISSISSIPPI INDUSTRIES FOR THE DEVELOPMENTALLY DISABLED (MIDD) | — | 104063 | 1978-02-03 | | JACKSON |
| MISSISSIPPI INSTITUTE FOR TECHNICAL AND ECONOMIC RESOSURCES, INC. | — | 104070 | 1978-04-25 | Active | MC COMB |
| MISSISSIPPI INVESTMENT AND DEVELOPMENT COMPANY, INC. | — | 439759 | 1978-01-10 | Dissolved | |
| MISSISSIPPI INVESTMENT AND MORTGAGE CORPORATION | — | 439763 | 1978-04-28 | Dissolved | |
| MISSISSIPPI INVESTORS, INC. | — | 104081 | 1978-05-15 | Dissolved | OCEAN SPRINGS |
| MISSISSIPPI IRRIGATION, INC. | — | 104082 | 1978-07-26 | Dissolved | |
| MISSISSIPPI LAND AND MINERAL DEVELOPMENT CORPORATION | Real estate and leasing | 104100 | 1978-03-01 | Active | Gulfport |
| MISSISSIPPI LAW INSTITUTE, INC. | — | 104103 | 1978-03-30 | Active | JACKSON |
| MISSISSIPPI LURE MFG., INC. | — | 439838 | 1978-02-27 | Dissolved | |
| MISSISSIPPI MAGIRUS TRUCK SALES, INC. | — | 104133 | 1978-08-31 | Dissolved | |
| MISSISSIPPI MANAGEMENT CORPORATION | — | 439845 | 1978-01-31 | | |
| MISSISSIPPI MEDIA PROFESSIONALS, INC. | — | 603131 | 1978-11-16 | Active | MERIDIAN |
| MISSISSIPPI MEDICAL PRODUCTS, INC. | — | 530989 | 1978-09-20 | Dissolved | BRANDON |
| MISSISSIPPI METHODIST REHABILITATION CENTER AUXILIARY, INC. | — | 104169 | 1978-12-04 | Active | Jackson |
| MISSISSIPPI MINING AND MINERALS COMPANY | — | 439880 | 1978-08-29 | Canceled | Gulfport |
| MISSISSIPPI MUFFLER SHOPS AND SUPPLY, INC. | — | 104199 | 1978-02-13 | Dissolved | |
| MISSISSIPPI OFFENDERS AND VOLUNTEER EFFORT OF HARRISON COUNTY, INC. | — | 104236 | 1978-03-23 | Active | GULFPORT |
| MISSISSIPPI OPTOMETRIC FUND, INC. | — | 104253 | 1978-06-06 | Active | JACKSON |
| MISSISSIPPI PACKAGING CORP. | — | 104261 | 1978-06-12 | Dissolved | |
| MISSISSIPPI PLASTIC PIPE, INC. | — | 104285 | 1978-03-27 | Dissolved | |
| MISSISSIPPI PRESS SERVICES, INC. | Professional services | 104303 | 1978-01-17 | Active | Jackson |
| MISSISSIPPI PRESS WOMEN, INC. | — | 104304 | 1978-11-16 | | MERIDIAN |
| MISSISSIPPI PRODUCT LIABILITY TASK FORCE, INC. | — | 104308 | 1978-06-12 | Dissolved | |