| S & J LOGISTICS LLCFrederick, MD | 3548528 | 1 |
| S & L WATER SOLUTIONSHagerstown, MD | 4317476 | 1 |
| S&G SWIFT TRANSPORT LIMITED LIABILITY COMPANYBryans Road, MD | 4297707 | 2 |
| S&R TRANSPORT COMPANY INCGlen Burnie, MD | 2970807 | 6 |
| S&R TRANSPORTS LLCAnnapolis, MD | 1368304 | 1 |
| S&S LIONS DELIVERY SERVICES LLCHagerstown, MD | 3538806 | 1 |
| SAE TRANSPORT LLCElkridge, MD | 1304916 | 1 |
| SALVA CONSTRUCTION INCHyattsville, MD | 2559757 | 1 |
| SAMUEL C LINTON IIINanjemoy, MD | 32608 | 2 |
| SANDHU TRANSPORT INCReisterstown, MD | 3942242 | 10 |
| SANTIAGO RAMOSHyattsville, MD | 2498380 | 1 |
| SARA SANCHEZ TOWING LLCSilver Spring, MD | 3170951 | 1 |
| SARAVIA TRUCKING LLCHyattsville, MD | 1551609 | 1 |
| SAVAL FOODS CORPORATIONElkridge, MD | 176138 | 53 |
| SCORPION TRANSPORT LLCHanover, MD | 3788485 | 2 |
| SEA EXPRESS LOGISTICS LLCLexington Park, MD | 2726891 | 3 |
| SEEKFORD TRUCKING LLCMechanicsville, MD | 3315948 | 1 |
| SEMAY TRUCKING LLCReisterstown, MD | 3910536 | 4 |
| SEW FRIEL LLCQueenstown, MD | 33544 | 1 |
| SHAFIC MASSISRockville, MD | 2107139 | 1 |
| SHALOM EXPRESS TRANSPORTATION LLCHyattsville, MD | 3804724 | 2 |
| SHARP BROTHERS TRUCKINGWestminster, MD | 1043658 | 2 |
| SHCM WORLDWIDE INCSparrows Point, MD | 3057377 | 16 |
| SHEDRICK AUTOMOTIVES TOWING HAULING AND LAWN SERVICES LLCBaltimore, MD | 4381592 | 2 |
| SHIPPERMAN TRANSPORTATION AND LOGISTICS LLCHagerstown, MD | 4101686 | 2 |
| SHIRES TRANSPORT LLCBelcamp, MD | 4392999 | 7 |
| SHORE DISTRIBUTORS INCSalisbury, MD | 7663 | 8 |
| SILVER RUN TRUCKING LLCWestminster, MD | 4268687 | 1 |
| SILVER TRANSPORTATION LLCBowie, MD | 3726223 | 3 |
| SIMPSON ROAD GROUP LLCCalverton, MD | 4258859 | 1 |
| SINGH BROS TRANSPORT LLCElkridge, MD | 3021228 | 2 |
| SKYLINE INVESTMENTS GROUP LLCSilver Spring, MD | 4147968 | 2 |
| SKYLINE TRUCKING INCHanover, MD | 3436757 | 2 |
| SM AUTO WORLD LLCGermantown, MD | 4192665 | 1 |
| SMILODON SYSTEMS LLCWest Friendship, MD | 2837926 | 3 |
| SMITH & BELT ENT INCWestminster, MD | 1028547 | 65 |
| SML QUICK TRUCKING INCChevy Chase, MD | 4131536 | 5 |
| SN EXPRESS LLCRosedale, MD | 4096045 | 4 |
| SN LOGISTICS INCColumbia, MD | 3587313 | 66 |
| SNOWDEN'S DELIVERY SERVICE LLCWindsor Mill, MD | 2347257 | 1 |
| SOLID FREIGHT CONNECTION LLCBladensburg, MD | 3522327 | 1 |
| SOUTH62 TRANSPORT LLCFort Washington, MD | 3033922 | 15 |
| SPECIFIED COMMODITY CARRIERS INCWestminster, MD | 6862 | 12 |
| SRAN TRANSPORT INCLaurel, MD | 2395980 | 5 |
| SSS TRUCKING LLCSilver Spring, MD | 3836602 | 6 |
| SSSJ INCBeltsville, MD | 3216926 | 3 |
| SST EXPRESS LLCHarwood, MD | 4228787 | 1 |
| STANLEY KEGARISE QUALITY ROOFINGHagerstown, MD | 1512113 | 1 |
| STANLEY TRUCKING INCTyaskin, MD | 878868 | 1 |
| STANLEY'S TRANSPORT CORPBowie, MD | 3865271 | 1 |
| STAR TRUCKING INCRidgely, MD | 369488 | 4 |
| STEEL PRODUCTS INCFrederick, MD | 454538 | 2 |
| STEPHENS EXCAVATING INCHagerstown, MD | 335897 | 7 |
| STEVE'S ROAD SERVICE LLCElkton, MD | 425477 | 7 |
| STEVEN L WALLACEFruitland, MD | 1565708 | 4 |
| STEWART & SONS SERVICES LLCHurlock, MD | 2397959 | 1 |
| STRAIGHT LINE MOVERS INCCapitol Heights, MD | 3183719 | 5 |
| STRIVE FOR GREATNESSFrederick, MD | 4074006 | 1 |
| SUAREZSOLUTIONSLLCWaldorf, MD | 4494745 | 1 |
| SUPERIOR EAGLE TRANSPORT LLCFort Washington, MD | 2500767 | 1 |
| SUPERIOR TOURS INCBaltimore, MD | 658588 | 7 |
| SUPERIOR TRANSFER INCBaltimore, MD | 163637 | 3 |
| SUPREME CONSTRUCTION LLCSilver Spring, MD | 4355326 | 1 |
| SURESHOT DELIVERY SERVICE INCHagerstown, MD | 986179 | 1 |
| SUSIE A FARLOWSalisbury, MD | 903780 | 1 |
| SV TRUCKING LLCSalisbury, MD | 4111524 | 1 |
| SYNAGRO SOUTH LLCBaltimore, MD | 271617 | 61 |