| 1 | 621111 | OFFICES OF PHYSICIANS (EXCEPT MENTAL HEALTH SPECIALISTS) | $1,033,247,173 | 4 |
| 2 | 541990 | ALL OTHER PROFESSIONAL, SCIENTIFIC, AND TECHNICAL SERVICES | $63,800,512 | 1 |
| 3 | 236220 | COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION | $47,451,713 | 4 |
| 4 | 541715 | RESEARCH AND DEVELOPMENT IN THE PHYSICAL, ENGINEERING, AND LIFE SCIENCES (EXCEPT NANOTECHNOLOGY AND BIOTECHNOLOGY) | $16,890,553 | 6 |
| 5 | 541330 | ENGINEERING SERVICES | $13,852,873 | 3 |
| 6 | 541714 | RESEARCH AND DEVELOPMENT IN BIOTECHNOLOGY (EXCEPT NANOBIOTECHNOLOGY) | $13,003,913 | 2 |
| 7 | 334511 | SEARCH, DETECTION, NAVIGATION, GUIDANCE, AERONAUTICAL, AND NAUTICAL SYSTEM AND INSTRUMENT MANUFACTURING | $12,931,628 | 1 |
| 8 | 561210 | FACILITIES SUPPORT SERVICES | $12,809,002 | 41 |
| 9 | 541611 | ADMINISTRATIVE MANAGEMENT AND GENERAL MANAGEMENT CONSULTING SERVICES | $10,167,366 | 1 |
| 10 | 562211 | HAZARDOUS WASTE TREATMENT AND DISPOSAL | $9,395,724 | 1 |
| 11 | 221122 | ELECTRIC POWER DISTRIBUTION | $2,781,467 | 1 |
| 12 | 561720 | JANITORIAL SERVICES | $2,135,929 | 1 |
| 13 | 541690 | OTHER SCIENTIFIC AND TECHNICAL CONSULTING SERVICES | $1,069,921 | 1 |
| 14 | 238220 | PLUMBING, HEATING, AND AIR-CONDITIONING CONTRACTORS | $1,057,963 | 1 |
| 15 | 541519 | OTHER COMPUTER RELATED SERVICES | $999,613 | 6 |
| 16 | 541512 | COMPUTER SYSTEMS DESIGN SERVICES | $913,367 | 2 |
| 17 | 334516 | ANALYTICAL LABORATORY INSTRUMENT MANUFACTURING | $819,881 | 6 |
| 18 | 541930 | TRANSLATION AND INTERPRETATION SERVICES | $477,244 | 66 |
| 19 | 221210 | NATURAL GAS DISTRIBUTION | $400,450 | 1 |
| 20 | 562920 | MATERIALS RECOVERY FACILITIES | $299,400 | 1 |
| 21 | 541511 | CUSTOM COMPUTER PROGRAMMING SERVICES | $251,380 | 1 |
| 22 | 238210 | ELECTRICAL CONTRACTORS AND OTHER WIRING INSTALLATION CONTRACTORS | $242,708 | 1 |
| 23 | 336413 | OTHER AIRCRAFT PARTS AND AUXILIARY EQUIPMENT MANUFACTURING | $232,917 | 5 |
| 24 | 337214 | OFFICE FURNITURE (EXCEPT WOOD) MANUFACTURING | $230,488 | 4 |
| 25 | 621511 | MEDICAL LABORATORIES | $197,017 | 3 |
| 26 | 811213 | COMMUNICATION EQUIPMENT REPAIR AND MAINTENANCE | $168,000 | 1 |
| 27 | 541620 | ENVIRONMENTAL CONSULTING SERVICES | $167,449 | 1 |
| 28 | 339112 | SURGICAL AND MEDICAL INSTRUMENT MANUFACTURING | $143,967 | 1 |
| 29 | 811219 | OTHER ELECTRONIC AND PRECISION EQUIPMENT REPAIR AND MAINTENANCE | $122,007 | 3 |
| 30 | 325120 | INDUSTRIAL GAS MANUFACTURING | $100,249 | 1 |
| 31 | 315990 | APPAREL ACCESSORIES AND OTHER APPAREL MANUFACTURING | $78,000 | 1 |
| 32 | 492210 | LOCAL MESSENGERS AND LOCAL DELIVERY | $74,647 | 1 |
| 33 | 334111 | ELECTRONIC COMPUTER MANUFACTURING | $46,881 | 1 |
| 34 | 334513 | INSTRUMENTS AND RELATED PRODUCTS MANUFACTURING FOR MEASURING, DISPLAYING, AND CONTROLLING INDUSTRIAL PROCESS VARIABLES | $45,205 | 1 |
| 35 | 562910 | REMEDIATION SERVICES | $43,796 | 1 |
| 36 | 524298 | ALL OTHER INSURANCE RELATED ACTIVITIES | $41,133 | 1 |
| 37 | 541380 | TESTING LABORATORIES AND SERVICES | $30,839 | 1 |
| 38 | 337122 | NONUPHOLSTERED WOOD HOUSEHOLD FURNITURE MANUFACTURING | $25,708 | 1 |
| 39 | 621330 | OFFICES OF MENTAL HEALTH PRACTITIONERS (EXCEPT PHYSICIANS) | $21,926 | 1 |
| 40 | 332996 | FABRICATED PIPE AND PIPE FITTING MANUFACTURING | $16,650 | 1 |
| 41 | 811118 | OTHER AUTOMOTIVE MECHANICAL AND ELECTRICAL REPAIR AND MAINTENANCE | $6,209 | 1 |
| 42 | 332710 | MACHINE SHOPS | $3,859 | 1 |
| 43 | 332618 | OTHER FABRICATED WIRE PRODUCT MANUFACTURING | $3,015 | 1 |