| 1 | MCU | MID COLUMBIA BUS CO INC | | | SCAC4 |
| 2 | MCU | Mediterranea Centrale Umbra | 1915 - 1956 | I | TRAFFIC |
| 3 | MCUC | MCCULLEY MARINE SERVICES INC | | | SCAC4 |
| 4 | MCUH | MAYER CUSTOM HOUSE BROKER INC | | | SCAC4 |
| 5 | MCUK | MCMASTER UNIVERSITY | | | SCAC4 |
| 6 | MCUN | MCLAUGHLIN & CHARLES TRUCKING CORP | | | SCAC4 |
| 7 | MCUQ | MACS TRUCKING | | | SCAC4 |
| 8 | MCUR | METRO COURIERS INC | | | SCAC4 |
| 9 | MCUU | MCR MOBILE CONTAINER REPAIR AB | | S | BIC |
| 10 | MCUU | MCT | | | SCAC4 |
| 11 | MCUX | Monroe Chemical Works (River Raisin Paper Co.) | 7/1923-7/1930 | | NAKINA |
| 12 | MCUX | RIVER RAISEN PAPER CO. [MONROE CHEMICAL WORKS] | | | PWRC |
