| 1 | DPCA | DIVERSIFIED PLASTICS CORPORATION | | | SCAC4 |
| 2 | DPCE | DAKOTA PLAINS COOPERATIVE | | | SCAC4 |
| 3 | DPCH | DWK TRANSPORT | | | SCAC4 |
| 4 | DPCHJ | Dopravní podnik měst Chomutova a Jirkova | | CZ | TRAFFIC |
| 5 | DPCL | DAVES PILOT CAR SERVICE | | | SCAC4 |
| 6 | DPCR | DUNLOP, JAMES TRUCKING | | | SCAC4 |
| 7 | DPCS | D & P COLLECTIBLES | | | SCAC4 |
| 8 | DPCT | DOUGLAS PLAINS CATTLE & TRUCKING | | | SCAC4 |
| 9 | DPCU | DUPONT | | USA | BIC |
| 10 | DPCU | Dupont | | | RSRV |
| 11 | DPCU | E.I. DUPONT DE NEMOURS, INC. | | | SCAC3 |
| 12 | DPCX | Blue Circle, Inc. | added 7/1983; eliminated 10/1988 | | NAKINA |
| 13 | DPCX | Martin-Marietta Corp. | added 1/1979; 1/1980; eliminated 7/1983 | | NAKINA |
| 14 | DPCX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/1972; 1/1975; eliminated 1/1979 | | NAKINA |
| 15 | DPCX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | added 7/1962; 7/1965-4/1970; eliminated 10/1972 | | NAKINA |
| 16 | DPCX | Dewwy Portland Cement Co., Division of American-Marietta Co. | added 7/1960; 4/1961; eliminated 7/1962 | | NAKINA |
| 17 | DPCX | Dewey Portland Cement Co. | 8/1920-7/1932; 1/1941-10/1957; eliminated 7/1960 | | NAKINA |
| 18 | DPCX | Dewey Portland Cement Co. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 19 | DPCX | Dewwy Portland Cement Co., Division of American-Marietta Co. | added 7/60; 4/61 | | NRHS |
| 20 | DPCX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | 7/65-4/70; eliminated 10/72 | | NRHS |
| 21 | DPCX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | | NRHS |
| 22 | DPCX | Martin-Marietta Corp. | added 1/79; 1/80 | | NRHS |
| 23 | DPCX | Blue Circle, Inc. | eliminated 10/88 | | NRHS |
| 24 | DPCX | BLUE CIRCLE INC. [MARTIN-MARIETTA CORP.; DEWEY PORTLAND CEMENT CO.] | | | PWRC |
| 25 | DPCX | Dewey Portland Cement (Dragon Products) | | | RSRV |
| 26 | DPCX | Dragon Cement | | USA | TRAFFIC |
| 27 | DPCZ | DELTECH POLYMERS COMPANY, INC. | | | PWRC |