| 1 | 561210 | FACILITIES SUPPORT SERVICES | $79,210,533,825 | 5 |
| 2 | 237110 | WATER AND SEWER LINE AND RELATED STRUCTURES CONSTRUCTION | $409,095,231 | 2 |
| 3 | 541330 | ENGINEERING SERVICES | $106,782,952 | 4 |
| 4 | 611519 | OTHER TECHNICAL AND TRADE SCHOOLS | $56,793,271 | 1 |
| 5 | 336419 | OTHER GUIDED MISSILE AND SPACE VEHICLE PARTS AND AUXILIARY EQUIPMENT MANUFACTURING | $47,549,661 | 3 |
| 6 | 541519 | OTHER COMPUTER RELATED SERVICES | $28,830,965 | 1 |
| 7 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $24,926,746 | 2 |
| 8 | 621999 | ALL OTHER MISCELLANEOUS AMBULATORY HEALTH CARE SERVICES | $20,683,279 | 1 |
| 9 | 221122 | ELECTRIC POWER DISTRIBUTION | $16,633,195 | 6 |
| 10 | 561612 | SECURITY GUARDS AND PATROL SERVICES | $10,205,086 | 1 |
| 11 | 541712 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT BIOTECHNOLOGY) | $9,686,544 | 1 |
| 12 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $9,144,278 | 1 |
| 13 | 517919 | ALL OTHER TELECOMMUNICATIONS | $8,891,877 | 1 |
| 14 | 339112 | SURGICAL AND MEDICAL INSTRUMENT MANUFACTURING | $6,906,805 | 3 |
| 15 | 562910 | REMEDIATION SERVICES | $3,274,360 | 1 |
| 16 | 221112 | FOSSIL FUEL ELECTRIC POWER GENERATION | $1,904,434 | 1 |
| 17 | 511210 | SOFTWARE PUBLISHERS | $1,518,656 | 2 |
| 18 | 333316 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $1,370,120 | 2 |
| 19 | 561110 | OFFICE ADMINISTRATIVE SERVICES | $1,332,241 | 1 |
| 20 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $1,243,178 | 1 |
| 21 | 238220 | PLUMBING, HEATING, AND AIR-CONDITIONING CONTRACTORS | $1,021,141 | 1 |
| 22 | 221210 | NATURAL GAS DISTRIBUTION | $822,318 | 2 |
| 23 | 925120 | ADMINISTRATION OF URBAN PLANNING AND COMMUNITY AND RURAL DEVELOPMENT | $461,426 | 1 |
| 24 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $421,772 | 1 |
| 25 | 532490 | OTHER COMMERCIAL AND INDUSTRIAL MACHINERY AND EQUIPMENT RENTAL AND LEASING | $322,506 | 1 |
| 26 | 561720 | JANITORIAL SERVICES | $312,739 | 1 |
| 27 | 611710 | EDUCATIONAL SUPPORT SERVICES | $268,125 | 1 |
| 28 | 621511 | MEDICAL LABORATORIES | $257,838 | 1 |
| 29 | 541380 | TESTING LABORATORIES AND SERVICES | $246,182 | 2 |
| 30 | 561320 | TEMPORARY HELP SERVICES | $229,876 | 6 |
| 31 | 324110 | PETROLEUM REFINERIES | $221,452 | 1 |
| 32 | 325120 | INDUSTRIAL GAS MANUFACTURING | $204,951 | 2 |
| 33 | 541211 | OFFICES OF CERTIFIED PUBLIC ACCOUNTANTS | $196,000 | 1 |
| 34 | 541618 | OTHER MANAGEMENT CONSULTING SERVICES | $185,106 | 2 |
| 35 | 541310 | ARCHITECTURAL SERVICES | $182,591 | 1 |
| 36 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $136,147 | 1 |
| 37 | 812320 | DRYCLEANING AND LAUNDRY SERVICES (EXCEPT COIN-OPERATED) | $120,033 | 1 |
| 38 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $111,275 | 2 |
| 39 | 562111 | SOLID WASTE COLLECTION | $82,590 | 2 |
| 40 | 443120 | COMPUTER AND SOFTWARE STORES | $72,983 | 1 |
| 41 | 332311 | PREFABRICATED METAL BUILDING AND COMPONENT MANUFACTURING | $65,167 | 1 |
| 42 | 325413 | IN-VITRO DIAGNOSTIC SUBSTANCE MANUFACTURING | $64,077 | 2 |
| 43 | 517110 | WIRED TELECOMMUNICATIONS CARRIERS | $60,607 | 1 |
| 44 | 339113 | SURGICAL APPLIANCE AND SUPPLIES MANUFACTURING | $55,718 | 3 |
| 45 | 221310 | WATER SUPPLY AND IRRIGATION SYSTEMS | $52,309 | 1 |
| 46 | 333298 | ALL OTHER INDUSTRIAL MACHINERY MANUFACTURING | $50,896 | 1 |
| 47 | 621111 | OFFICES OF PHYSICIANS (EXCEPT MENTAL HEALTH SPECIALISTS) | $38,274 | 2 |
| 48 | 517311 | WIRED TELECOMMUNICATIONS CARRIERS | $26,218 | 2 |
| 49 | 339114 | DENTAL EQUIPMENT AND SUPPLIES MANUFACTURING | $26,118 | 3 |
| 50 | 561710 | EXTERMINATING AND PEST CONTROL SERVICES | $24,355 | 2 |
| 51 | 515111 | RADIO NETWORKS | $22,221 | 1 |
| 52 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $19,552 | 1 |
| 53 | 562119 | OTHER WASTE COLLECTION | $17,525 | 1 |
| 54 | 333315 | PHOTOGRAPHIC AND PHOTOCOPYING EQUIPMENT MANUFACTURING | $16,471 | 1 |
| 55 | 423710 | HARDWARE MERCHANT WHOLESALERS | $13,687 | 1 |
| 56 | 811219 | OTHER ELECTRONIC AND PRECISION EQUIPMENT REPAIR AND MAINTENANCE | $11,703 | 1 |
| 57 | 238990 | ALL OTHER SPECIALTY TRADE CONTRACTORS | $10,642 | 1 |
| 58 | 562112 | HAZARDOUS WASTE COLLECTION | $8,697 | 1 |
| 59 | 335122 | COMMERCIAL, INDUSTRIAL, AND INSTITUTIONAL ELECTRIC LIGHTING FIXTURE MANUFACTURING | $6,673 | 1 |
| 60 | 423720 | PLUMBING AND HEATING EQUIPMENT AND SUPPLIES (HYDRONICS) MERCHANT WHOLESALERS | $6,672 | 1 |
| 61 | 238150 | GLASS AND GLAZING CONTRACTORS | $4,790 | 1 |