| 1 | DP | Air 2000 Ltd. | ICAO: AMM, Callsign: Jetset, IATA Prefix: 091, Name changed to First Choice Airways Ltd. | GB | AVCODES |
| 2 | DP | Dunlop Rubber Company Ltd. (Aviation Division) | Callsign: Dunlop, | GB | AVCODES |
| 3 | DP | First Choice Airways Limited. | ICAO: AMM, Callsign: Jetset, IATA Prefix: 091, Name changed from Air 2000 Ltd. ICAO designator will change to FCA w.e.f. 14 January 2003. | GB | AVCODES |
| 4 | DP | Air Sinai | ICAO: ASD, Callsign: Air Sinai, Designator DP recalled by IATA | ET | AVCODES |
| 5 | DP | First Choice Airways Limited | ICAO: FCA, Callsign: Jetset, IATA Prefix: 091, Merged with Thomsonfly Ltd to form Thomson Airways Ltd on 01 November 2008. Name changed from Air 2000 Ltd. ICAO designator will change from AMM w.e.f. 14 January 2003. | GB | AVCODES |
| 6 | DP | Pobeda Airlines LLC | ICAO: PBD, Callsign: Pobeda, Founded on 16 September 2014. Commenced operations on 01 December 2014. Low cost subsidary of Aeroflot | RUS | AVCODES |
| 7 | DP | Deer Park Ry. (Co.) | 7/1935-7/1954 | | NAKINA |
| 8 | DP | Deer Park Ry. | 4/38-1/52 | | NRHS |
| 9 | DP | Deutsche Privatbahn GmbH | Hameln | D | privat-bahn.de |
| 10 | DP | DEER PARK RAILWAY | | | PWRC |
| 11 | DP | Deutsche Post (DDR) | | DDR | TRAFFIC |
| 12 | DP | DP Deutsche Privatbahn GmbH | | DE | VKM |
| 13 | DP01 | (RAIL) CSD-DEPRE PRODUCT | | | PWRC |
| 14 | DP02 | (RAIL) CSD-DEPRE PRODUCT | | | PWRC |
| 15 | DP03 | (RAIL) CSD-RTMS-DEPRE PRODUCT | | | PWRC |
| 16 | DP04 | (RAIL) CSD-RTMS-DEPRE PRODUCT - ASHLAND PETROLEUM CO | | | PWRC |
| 17 | DP05 | (RAIL) CSD-RTMS-DEPRE PRODUCT | | | PWRC |
| 18 | DP06 | (RAIL) CSD-WILLIAM GIBB, POSSE-DEPRE PRODUCT | | | PWRC |
| 19 | DPAF | DEER PARK AUTO FREIGHT | | | SCAC1 |
| 20 | DPAM | DREW PROPERTY AND MARINE TRANSPORTA | | | SCAC4 |
| 21 | DPB | Dopravny Podnik Bratislava | City: Bratislava | SK | TRAFFIC |
| 22 | DPBT | DEPENDABLE TRANSPORT INC | | | SCAC4 |
| 23 | DPBX | E.I. du Pont de Nemours & Co. | 8/1920 | | NAKINA |
| 24 | DPBX | E.I. DUPONT DE NEMOURS & CO. | | | PWRC |
| 25 | DPCA | DIVERSIFIED PLASTICS CORPORATION | | | SCAC4 |
| 26 | DPCE | DAKOTA PLAINS COOPERATIVE | | | SCAC4 |
| 27 | DPCH | DWK TRANSPORT | | | SCAC4 |
| 28 | DPCHJ | Dopravní podnik měst Chomutova a Jirkova | | CZ | TRAFFIC |
| 29 | DPCL | DAVES PILOT CAR SERVICE | | | SCAC4 |
| 30 | DPCR | DUNLOP, JAMES TRUCKING | | | SCAC4 |
| 31 | DPCS | D & P COLLECTIBLES | | | SCAC4 |
| 32 | DPCT | DOUGLAS PLAINS CATTLE & TRUCKING | | | SCAC4 |
| 33 | DPCU | DUPONT | | USA | BIC |
| 34 | DPCU | Dupont | | | RSRV |
| 35 | DPCU | E.I. DUPONT DE NEMOURS, INC. | | | SCAC3 |
| 36 | DPCX | Blue Circle, Inc. | added 7/1983; eliminated 10/1988 | | NAKINA |
| 37 | DPCX | Martin-Marietta Corp. | added 1/1979; 1/1980; eliminated 7/1983 | | NAKINA |
| 38 | DPCX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/1972; 1/1975; eliminated 1/1979 | | NAKINA |
| 39 | DPCX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | added 7/1962; 7/1965-4/1970; eliminated 10/1972 | | NAKINA |
| 40 | DPCX | Dewwy Portland Cement Co., Division of American-Marietta Co. | added 7/1960; 4/1961; eliminated 7/1962 | | NAKINA |
| 41 | DPCX | Dewey Portland Cement Co. | 8/1920-7/1932; 1/1941-10/1957; eliminated 7/1960 | | NAKINA |
| 42 | DPCX | Dewey Portland Cement Co. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 43 | DPCX | Dewwy Portland Cement Co., Division of American-Marietta Co. | added 7/60; 4/61 | | NRHS |
| 44 | DPCX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | 7/65-4/70; eliminated 10/72 | | NRHS |
| 45 | DPCX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | | NRHS |
| 46 | DPCX | Martin-Marietta Corp. | added 1/79; 1/80 | | NRHS |
| 47 | DPCX | Blue Circle, Inc. | eliminated 10/88 | | NRHS |
| 48 | DPCX | BLUE CIRCLE INC. [MARTIN-MARIETTA CORP.; DEWEY PORTLAND CEMENT CO.] | | | PWRC |
| 49 | DPCX | Dewey Portland Cement (Dragon Products) | | | RSRV |
| 50 | DPCX | Dragon Cement | | USA | TRAFFIC |
| 51 | DPCZ | DELTECH POLYMERS COMPANY, INC. | | | PWRC |
| 52 | DPDD | DEPENDABLE TRUCKING EXPEDITED SERVI | | | SCAC4 |
| 53 | DPDG | DAMPIER & DAUGHTERS | | | SCAC4 |
| 54 | DPDK | DINKS, P D TRUCKING | | | SCAC4 |
| 55 | DPDM | DISTRIBUTION P D M 2000 INC | | | SCAC4 |
| 56 | DPDU | DU PONT DE NEMOURS (NEDERLANDS) BV | | | SCAC4 |
| 57 | DPDZ | DELAWARE AND HUDSON RAILWAY COMPANY, INC. | | | PWRC |
| 58 | DPDZ | Delaware and Hudson Railway | | | RSRV |
| 59 | DPEG | D & P EXPRESS LOGISTICS LLC | | | SCAC4 |
| 60 | DPEM | DASSELS PETROLEUM INC | | | SCAC4 |
| 61 | DPEN | DOWLING, PATRICK ENTERPRISES | | | SCAC4 |
| 62 | DPEO | D'AMICO PETROLEUM INCORPORATED | | | SCAC4 |
| 63 | DPEP | DOUBLE P EXPRESS | | | SCAC4 |
| 64 | DPER | DELIVERY PEOPLE, THE | | | SCAC4 |
| 65 | DPET | DICKERSON PETROLEUM INC | | | SCAC4 |
| 66 | DPFI | DEER POND FUEL INC | | | SCAC4 |
| 67 | DPFN | DURUSSELS POTATO FARMS INC | | | SCAC4 |
| 68 | DPFS | DPF CLEANING SPECIALISTS LIMITED | | | SCAC4 |
| 69 | DPGE | DEMPSEY | | | SCAC4 |
| 70 | DPGX | Tractech Systems | 7/2005 (not listed) | | NAKINA |
| 71 | DPGX | E.I. du Pont de Nemours & Co. | 8/1920 | | NAKINA |
| 72 | DPGX | *E.I. DUPONT DE NEMOURS & CO. | | | PWRC |
| 73 | DPGX | +TRACTECH SYSTEMS | | | PWRC |
| 74 | DPGX | DuPont (Tractech Systems) | | | RSRV |
| 75 | DPGX | TRACTECH SYSTEMS | | | SCAC4 |
| 76 | DPH | Domodedovo Airport Handling, CJSC | | RUS | AVCODES |
| 77 | DPHE | DEPENDABLE HIGHWAY EXPRESS, INC | | | SCAC1 |
| 78 | DPHE | DEPENDABLE HIGHWAY EXPRESS INC | | | SCAC4 |
| 79 | DPHI | DHX INC | | | SCAC4 |
| 80 | DPHN | DOLPHIN TRANSPORT LTD | | | SCAC4 |
| 81 | DPHS | DELPHIS NV | | | SCAC4 |
| 82 | DPHY | DURAPHARM SYSTEMS INC | | | SCAC4 |
| 83 | DPID | DIAMOND PETROLEUM INC | | | SCAC4 |
| 84 | DPIM | DEEP INTERMODAL | | | SCAC4 |
| 85 | DPIN | DESERT PUMICE INC | | | SCAC4 |
| 86 | DPIP | DU PONT IMPRESSION INC | | | SCAC4 |
| 87 | DPIQ | DP LINE INC | | | SCAC4 |
| 88 | DPIU | EDF | | F | BIC |
| 89 | DPIX | Dufour Petroleum, Inc. | 1/1994 (not listed); added 1/1997; 7/2000; eliminated 7/2003; 7/2005 (not listed) | | NAKINA |
| 90 | DPIX | Distillation Products Industries, Division of Eastman Kodak Co. | 1/1952-7/1954; eliminated 1/1956 | | NAKINA |
| 91 | DPIX | Distillation Products Inc. | 1/1943-1/1950 | | NAKINA |
| 92 | DPIX | Distillation Products Industries, Division of Eastman Kodak Co. | Jan-52 | | NRHS |
| 93 | DPIX | Dufour Petroleum, Inc. | 1/94; added 1/97; 7/2000 | | NRHS |
| 94 | DPIX | *DISTILLATION PRODUCTS INDUSTRIES, DIV. EASTMAN KODAK CO. | | | PWRC |
| 95 | DPIX | +DUFOUR PETROLEUM, INC. | | | PWRC |
| 96 | DPIX | Dufour Petroleum | | | RSRV |
| 97 | DPIX | DUFOUR PETROLEUM, INC. | | | SCAC4 |
| 98 | DPJ | Delta Private Jets | Callsign: Jet Card, Merged into Wheels Up w.e.f. 31 January 2020. Name changed from Delta AirElite Business Jets. ICAO designator changed from ELJ. ICAO Callsign changed from Elite Jet | USA | AVCODES |
| 99 | DPJG | DRAPEAU CARTAGE | | | SCAC4 |
| 100 | DPKI | DUPREE TRUCKING INC | | | SCAC4 |
