| 4101 | DPHE | DEPENDABLE HIGHWAY EXPRESS INC | | | SCAC4 |
| 4102 | DPHI | DHX INC | | | SCAC4 |
| 4103 | DPHN | DOLPHIN TRANSPORT LTD | | | SCAC4 |
| 4104 | DPHS | DELPHIS NV | | | SCAC4 |
| 4105 | DPHY | DURAPHARM SYSTEMS INC | | | SCAC4 |
| 4106 | DPID | DIAMOND PETROLEUM INC | | | SCAC4 |
| 4107 | DPIM | DEEP INTERMODAL | | | SCAC4 |
| 4108 | DPIN | DESERT PUMICE INC | | | SCAC4 |
| 4109 | DPIP | DU PONT IMPRESSION INC | | | SCAC4 |
| 4110 | DPIQ | DP LINE INC | | | SCAC4 |
| 4111 | DPIU | EDF | | F | BIC |
| 4112 | DPIX | Dufour Petroleum, Inc. | 1/1994 (not listed); added 1/1997; 7/2000; eliminated 7/2003; 7/2005 (not listed) | | NAKINA |
| 4113 | DPIX | Distillation Products Industries, Division of Eastman Kodak Co. | 1/1952-7/1954; eliminated 1/1956 | | NAKINA |
| 4114 | DPIX | Distillation Products Inc. | 1/1943-1/1950 | | NAKINA |
| 4115 | DPIX | Distillation Products Industries, Division of Eastman Kodak Co. | Jan-52 | | NRHS |
| 4116 | DPIX | Dufour Petroleum, Inc. | 1/94; added 1/97; 7/2000 | | NRHS |
| 4117 | DPIX | *DISTILLATION PRODUCTS INDUSTRIES, DIV. EASTMAN KODAK CO. | | | PWRC |
| 4118 | DPIX | +DUFOUR PETROLEUM, INC. | | | PWRC |
| 4119 | DPIX | Dufour Petroleum | | | RSRV |
| 4120 | DPIX | DUFOUR PETROLEUM, INC. | | | SCAC4 |
| 4121 | 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 |
| 4122 | DPJG | DRAPEAU CARTAGE | | | SCAC4 |
| 4123 | DPKI | DUPREE TRUCKING INC | | | SCAC4 |
| 4124 | DPKL | DONNYCORP TRUCKING LLC | | | SCAC4 |
| 4125 | DPKT | DAMPSKIBSS | | | SCAC4 |
| 4126 | DPKU | UNITED NATIONS LOGISTICS BASE | | I | BIC |
| 4127 | DPL | Dome Petroleum Ltd. | Callsign: Dome, | CDN | AVCODES |
| 4128 | DPL | Dome Petroleum | | | ICAO1 |
| 4129 | DPL | DELMARVA POWER & LIGHT | | | PWRC |
| 4130 | DPLD | DEEPLAND EXPRESS | | | SCAC4 |
| 4131 | DPLL | DOMINOS PIZZA LLC | | | SCAC4 |
| 4132 | DPLN | DEPPE LINIE G M B H & CO | | | SCAC1 |
| 4133 | DPLN | DEPPE LINIE GMBH & CO | | | SCAC4 |
| 4134 | DPLS | DEPLOYED RESOURCES LLC | | | SCAC4 |
| 4135 | DPLX | Davenport Cement Co. | added 1/1984; eliminated 4/1985 | | NAKINA |
| 4136 | DPLX | Martin-Marietta Corp. | added 1/1979; 1/1980; eliminated 7/1983 | | NAKINA |
| 4137 | DPLX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/1972; 1/1975; eliminated 1/1979 | | NAKINA |
| 4138 | DPLX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | added 1/1965; 7/1965-4/1970; eliminated 10/1972 | | NAKINA |
| 4139 | DPLX | Dewey Portland Cement Co., Division of Martin-Marletta Corp. | added 1/65; 7/65-4/70; eliminated 10/72 | | NRHS |
| 4140 | DPLX | Martin-Marietta Cement, Division of Martin-Marietta Corp. | added 10/72; 1/75; eliminated 1/79 | | NRHS |
| 4141 | DPLX | Martin-Marietta Corp. | added 1/79; 1/80 | | NRHS |
| 4142 | DPLX | Davenport Cement Co. | eliminated 4/85 | | NRHS |
| 4143 | DPLX | DAVENPORT CEMENT CO.[MARTIN-MARIETTA CORP.; DEWEY PORTLAND CEMENT CO.] | | | PWRC |
| 4144 | DPLX | Davenport Cement | | | RSRV |
| 4145 | DPM | Deutsche Post Mobility GmbH | | D | TRAFFIC |
| 4146 | DPMBB | Dopravný podnik mesta Banská Bystrica | City: Banska Bystrica | SK | TRAFFIC |
| 4147 | DPMCB | Dopravní podnik města České Budějovice | City: České Budějovice | CZ | TRAFFIC |
| 4148 | DPMD | DURHAM PATTERN & MODEL LTD | | | SCAC4 |
| 4149 | DPME | DELPHIC FLAME SHIPPING CO., LTD. | | | SCAC4 |
| 4150 | DPMF | DETROIT-PITTSBURGH MOTOR FREIGHT, INC | | | SCAC1 |
| 4151 | DPMF | DETROIT-PITTSBURGH MOTOR FREIGHT, I | | | SCAC4 |
| 4152 | DPMG | DONMAC PRECISION MACHINING | | | SCAC4 |
| 4153 | DPMHK | Dopravní podnik města Hradce Králové | City: Hradec Králové | CZ | TRAFFIC |
| 4154 | DPMJ | Dopravní podnik města Jihlavy | City: Jihlava | CZ | TRAFFIC |
| 4155 | DPMK | Dopravni Podnik Mesta Kosice | City: Kosice | SK | TRAFFIC |
| 4156 | DPML | DEPALMA, PAUL M FUEL LLC | | | SCAC4 |
| 4157 | DPML | | Real: Dopravní podnik měst Liberce a Jablonce nad Nisou, City: Liberec | CZ | TRAFFIC |
| 4158 | DPMM | Dopravný podnik mesta Martin | City: Martin | SK | TRAFFIC |
| 4159 | DPMN | DELTA PRODUCE LP | | | SCAC4 |
| 4160 | DPMO | Dopravní Podnik Ostrava a.s. | Real: DPO, City: Ostrava | CZ | TRAFFIC |
| 4161 | DPMP | Dopravný podnik mesta Prešov, a. s. | | SK | TRAFFIC |
| 4162 | DPMUL | Dopravní podnik města Ústí nad Labem | City: Ústí nad Labem | CZ | TRAFFIC |
| 4163 | DPMZ | DYNO POLYMERS | | | PWRC |
| 4164 | DPMZ | Dopravný podnik mesta Žiliny s.r.o. | City: Žilina | SK | TRAFFIC |
| 4165 | DPNC | DRILL PRO INTERNATIONAL INC | | | SCAC4 |
| 4166 | DPND | DEPENDABLE TRANSPORTATION, INC | | | SCAC1 |
| 4167 | DPND | DEPENDABLE TRANSPORTATION INC | | | SCAC4 |
| 4168 | DPNE | DOLPHIN EXPRESS | | | SCAC4 |
| 4169 | DPNK | DEPENDABLE TRUCK LINES INC | | | SCAC4 |
| 4170 | DPNS | DAUPHINAIS, ALAIN | | | SCAC4 |
| 4171 | DPO | Dinazzano Pò S.p.A. | | IT | VKM |
| 4172 | DPOC | DEPALMA OIL COMPANY INC | | | SCAC4 |
| 4173 | DPOT | DEPOT EXPRESS INC | | | SCAC4 |
| 4174 | DPPD | DISTRICT PETROLEUM PRODUCTS INC | | | SCAC4 |
| 4175 | DPPM | DEPENDABLE-P | | | SCAC4 |
| 4176 | DPR | duisport rail GmbH | | DE | VKM |
| 4177 | DPRA | DIAZ PRODUCE | | | SCAC4 |
| 4178 | DPRD | DANAS PRIDE | | | SCAC4 |
| 4179 | DPRN | DOYLE TRANSPORTATION INC | | | SCAC4 |
| 4180 | DPRO | DOME PRODUCTIONS INC | | | SCAC4 |
| 4181 | DPRT | DAIGLE EXPRESS TRANSPORT INC | | | SCAC4 |
| 4182 | DPRU | LLC KVADRAT | | RUS | BIC |
| 4183 | DPRX | Deep Rock Refining Co. | added 4/1956; 10/1957-10/1966; eliminated 7/1968 | | NAKINA |
| 4184 | DPRX | Deep Rock Refining Co. | 10/57-10/66; eliminated 7/68 | | NRHS |
| 4185 | DPRX | DEEP ROCK REFINING CO. | | | PWRC |
| 4186 | DPS | Alabama Department of Public Safety | Callsign: Blue-Gray, | USA | AVCODES |
| 4187 | DPSA | DPS DISTRIBUTING | | | SCAC4 |
| 4188 | DPSC | DARRELLS PACKAGE EXPRESS LLC | | | SCAC4 |
| 4189 | DPSE | DIAMOND PETROLEUM SERVICES | | | SCAC4 |
| 4190 | DPSG | DPS CARGO | | | SCAC4 |
| 4191 | DPSH | DEEP SOUTH HAULING LLC | | | SCAC4 |
| 4192 | DPSL | DISPOSAL SERVICES INC | | | SCAC4 |
| 4193 | DPSM | DELTA POSEIDON SPECIAL MARITIME ENT | | | SCAC4 |
| 4194 | DPSPA | Dinazzano Po Spa. | | I | TRAFFIC |
| 4195 | DPSR | DISPATCH SERVICES INCORPORATED | | | SCAC4 |
| 4196 | DPSS | DEPLOYMENT SERVICES | | | SCAC4 |
| 4197 | DPSU | DART PORTABLE STORAGE, INC | | USA | BIC |
| 4198 | DPSU | Dart Portable Storage | | | RSRV |
| 4199 | DPSU | DART PORTABLE STORAGE INC | | | SCAC4 |
| 4200 | DPSV | D P SERVICES INC | | | SCAC4 |
