NAICS Code Directory

Federal Contracts by NAICS Code

The top 100 NAICS codes by federal contract spend. Pick your industry to see who's buying, who's already winning, and how to get daily opportunity alerts.

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NAICS — the North American Industry Classification System — is how the federal government categorizes every contractor and every procurement. When a contracting officer publishes a solicitation on SAM.gov, they tag it with one NAICS code. When you register your business in SAM, you pick the codes you want to win work under. NAICS is the discovery mechanism: get the codes wrong and you'll never show up in agency searches.

The 100 codes below represent $1968.5B in tracked federal contract value — the industries where federal spend actually concentrates. Engineering services, R&D, software development, aircraft, ammunition, facilities support: this is where the government writes the checks. Click any code for the incumbents, top buyers, and a daily alert feed.

Top 100 NAICS by federal spend

Sorted by spend ↓
  1. 1
    541330

    Engineering Services

    $146.4B tracked federal contract value · 411 contractors

  2. 2
    541715

    Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)

    $91.6B tracked federal contract value · 284 contractors

  3. 3
    541512

    Computer Systems Design Services

    $90.7B tracked federal contract value · 116 contractors

  4. 4
    334511

    Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing

    $86.8B tracked federal contract value · 89 contractors

  5. 5
    541511

    Custom Computer Programming Services

    $74.7B tracked federal contract value · 69 contractors

  6. 6
    336413

    Other Aircraft Parts and Auxiliary Equipment Manufacturing

    $69.4B tracked federal contract value · 105 contractors

  7. 7
    336411

    Aircraft Manufacturing

    $67.1B tracked federal contract value · 29 contractors

  8. 8
    334220

    Radio and Television Broadcasting and Wireless Communications Equipment Manufacturing

    $62.8B tracked federal contract value · 36 contractors

  9. 9
    332993

    Ammunition (except Small Arms) Manufacturing

    $62.2B tracked federal contract value · 36 contractors

  10. 10
    541519

    Other Computer Related Services

    $61.7B tracked federal contract value · 131 contractors

  11. 11
    524114

    Direct Health and Medical Insurance Carriers

    $61.1B tracked federal contract value · 19 contractors

  12. 12
    561210

    Facilities Support Services

    $57.5B tracked federal contract value · 77 contractors

  13. 13
    541611

    Administrative Management and General Management Consulting Services

    $53.9B tracked federal contract value · 145 contractors

  14. 14
    541990

    All Other Professional, Scientific, and Technical Services

    $47.6B tracked federal contract value · 107 contractors

  15. 15
    336611

    Ship Building and Repairing

    $47.1B tracked federal contract value · 52 contractors

  16. 16
    336414

    Guided Missile and Space Vehicle Manufacturing

    $41.2B tracked federal contract value · 18 contractors

  17. 17
    333318

    Other Commercial and Service Industry Machinery Manufacturing

    $38.4B tracked federal contract value · 8 contractors

  18. 18
    518210

    Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services

    $30.6B tracked federal contract value · 31 contractors

  19. 19
    488190

    Other Support Activities for Air Transportation

    $30.5B tracked federal contract value · 27 contractors

  20. 20
    541690

    Other Scientific and Technical Consulting Services

    $29.7B tracked federal contract value · 45 contractors

  21. 21
    541712

    Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology)

    $26.9B tracked federal contract value · 38 contractors

  22. 22
    336412

    Aircraft Engine and Engine Parts Manufacturing

    $25.6B tracked federal contract value · 23 contractors

  23. 23
    332510

    Hardware Manufacturing

    $24.7B tracked federal contract value · 12 contractors

  24. 24
    541612

    Human Resources Consulting Services

    $21.4B tracked federal contract value · 12 contractors

  25. 25
    332994

    Small Arms, Ordnance, and Ordnance Accessories Manufacturing

    $21.4B tracked federal contract value · 20 contractors

  26. 26
    335931

    Current-Carrying Wiring Device Manufacturing

    $21.4B tracked federal contract value · 6 contractors

  27. 27
    511210

    Software Publishers

    $21.3B tracked federal contract value · 36 contractors

  28. 28
    334290

    Other Communications Equipment Manufacturing

    $20.9B tracked federal contract value · 30 contractors

  29. 29
    561990

    All Other Support Services

    $20.2B tracked federal contract value · 8 contractors

  30. 30
    236220

    Commercial and Institutional Building Construction

    $19.7B tracked federal contract value · 131 contractors

  31. 31
    524292

    Pharmacy Benefit Management and Other Third Party Administration of Insurance and Pension Funds

    $19.7B tracked federal contract value · 9 contractors

  32. 32
    336992

    Military Armored Vehicle, Tank, and Tank Component Manufacturing

    $18.7B tracked federal contract value · 20 contractors

  33. 33
    541714

    Research and Development in Biotechnology (except Nanobiotechnology)

    $18.0B tracked federal contract value · 68 contractors

  34. 34
    513210

    Software Publishers

    $17.8B tracked federal contract value · 9 contractors

  35. 35
    541513

    Computer Facilities Management Services

    $17.1B tracked federal contract value · 23 contractors

  36. 36
    541614

    Process, Physical Distribution, and Logistics Consulting Services

    $15.2B tracked federal contract value · 8 contractors

  37. 37
    334111

    Electronic Computer Manufacturing

    $14.9B tracked federal contract value · 32 contractors

  38. 38
    811111

    General Automotive Repair

    $12.0B tracked federal contract value · 5 contractors

  39. 39
    333314

    Optical Instrument and Lens Manufacturing

    $11.9B tracked federal contract value · 7 contractors

  40. 40
    334412

    Bare Printed Circuit Board Manufacturing

    $11.7B tracked federal contract value · 9 contractors

  41. 41
    333612

    Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing

    $11.4B tracked federal contract value · 3 contractors

  42. 42
    333998

    All Other Miscellaneous General Purpose Machinery Manufacturing

    $10.8B tracked federal contract value · 8 contractors

  43. 43
    336999

    All Other Transportation Equipment Manufacturing

    $10.7B tracked federal contract value · 4 contractors

  44. 44
    541199

    All Other Legal Services

    $10.6B tracked federal contract value · 10 contractors

  45. 45
    332919

    Other Metal Valve and Pipe Fitting Manufacturing

    $10.6B tracked federal contract value · 12 contractors

  46. 46
    325412

    Pharmaceutical Preparation Manufacturing

    $10.6B tracked federal contract value · 21 contractors

  47. 47
    237990

    Other Heavy and Civil Engineering Construction

    $10.4B tracked federal contract value · 106 contractors

  48. 48
    541613

    Marketing Consulting Services

    $9.9B tracked federal contract value · 6 contractors

  49. 49
    561611

    Investigation and Personal Background Check Services

    $9.0B tracked federal contract value · 3 contractors

  50. 50
    334210

    Telephone Apparatus Manufacturing

    $8.9B tracked federal contract value · 5 contractors

  51. 51
    332991

    Ball and Roller Bearing Manufacturing

    $8.8B tracked federal contract value · 6 contractors

  52. 52
    336419

    Other Guided Missile and Space Vehicle Parts and Auxiliary Equipment Manufacturing

    $8.6B tracked federal contract value · 16 contractors

  53. 53
    517410

    Satellite Telecommunications

    $8.6B tracked federal contract value · 15 contractors

  54. 54
    333415

    Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing

    $8.5B tracked federal contract value · 6 contractors

  55. 55
    541219

    Other Accounting Services

    $8.4B tracked federal contract value · 10 contractors

  56. 56
    541618

    Other Management Consulting Services

    $8.4B tracked federal contract value · 11 contractors

  57. 57
    335999

    All Other Miscellaneous Electrical Equipment and Component Manufacturing

    $7.9B tracked federal contract value · 11 contractors

  58. 58
    562910

    Remediation Services

    $7.8B tracked federal contract value · 32 contractors

  59. 59
    541370

    Surveying and Mapping (except Geophysical) Services

    $6.4B tracked federal contract value · 12 contractors

  60. 60
    811219

    Other Electronic and Precision Equipment Repair and Maintenance

    $6.3B tracked federal contract value · 16 contractors

  61. 61
    611512

    Flight Training

    $5.8B tracked federal contract value · 13 contractors

  62. 62
    334418

    Printed Circuit Assembly (Electronic Assembly) Manufacturing

    $5.6B tracked federal contract value · 5 contractors

  63. 63
    481212

    Nonscheduled Chartered Freight Air Transportation

    $5.3B tracked federal contract value · 5 contractors

  64. 64
    334515

    Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals

    $5.3B tracked federal contract value · 13 contractors

  65. 65
    488111

    Air Traffic Control

    $5.1B tracked federal contract value · 1 contractors

  66. 66
    334419

    Other Electronic Component Manufacturing

    $5.1B tracked federal contract value · 15 contractors

  67. 67
    621111

    Offices of Physicians (except Mental Health Specialists)

    $4.9B tracked federal contract value · 9 contractors

  68. 68
    541720

    Research and Development in the Social Sciences and Humanities

    $4.8B tracked federal contract value · 23 contractors

  69. 69
    336211

    Motor Vehicle Body Manufacturing

    $4.6B tracked federal contract value · 6 contractors

  70. 70
    237110

    Water and Sewer Line and Related Structures Construction

    $4.6B tracked federal contract value · 15 contractors

  71. 71
    336320

    Motor Vehicle Electrical and Electronic Equipment Manufacturing

    $4.5B tracked federal contract value · 4 contractors

  72. 72
    541713

    Research and Development in Nanotechnology

    $4.4B tracked federal contract value · 7 contractors

  73. 73
    811210

    Electronic and Precision Equipment Repair and Maintenance

    $4.3B tracked federal contract value · 24 contractors

  74. 74
    541310

    Architectural Services

    $4.2B tracked federal contract value · 51 contractors

  75. 75
    541620

    Environmental Consulting Services

    $4.2B tracked federal contract value · 24 contractors

  76. 76
    333611

    Turbine and Turbine Generator Set Units Manufacturing

    $4.2B tracked federal contract value · 10 contractors

  77. 77
    336390

    Other Motor Vehicle Parts Manufacturing

    $4.2B tracked federal contract value · 7 contractors

  78. 78
    561612

    Security Guards and Patrol Services

    $4.1B tracked federal contract value · 30 contractors

  79. 79
    333413

    Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing

    $4.1B tracked federal contract value · 5 contractors

  80. 80
    336310

    Motor Vehicle Gasoline Engine and Engine Parts Manufacturing

    $4.1B tracked federal contract value · 4 contractors

  81. 81
    333242

    Semiconductor Machinery Manufacturing

    $4.1B tracked federal contract value · 1 contractors

  82. 82
    324110

    Petroleum Refineries

    $3.6B tracked federal contract value · 14 contractors

  83. 83
    811310

    Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance

    $3.6B tracked federal contract value · 18 contractors

  84. 84
    325920

    Explosives Manufacturing

    $3.5B tracked federal contract value · 19 contractors

  85. 85
    493110

    General Warehousing and Storage

    $3.5B tracked federal contract value · 9 contractors

  86. 86
    333618

    Other Engine Equipment Manufacturing

    $3.4B tracked federal contract value · 12 contractors

  87. 87
    332999

    All Other Miscellaneous Fabricated Metal Product Manufacturing

    $3.2B tracked federal contract value · 8 contractors

  88. 88
    336212

    Truck Trailer Manufacturing

    $3.1B tracked federal contract value · 3 contractors

  89. 89
    488390

    Other Support Activities for Water Transportation

    $3.1B tracked federal contract value · 5 contractors

  90. 90
    333310

    Commercial and Service Industry Machinery Manufacturing

    $3.0B tracked federal contract value · 8 contractors

  91. 91
    541380

    Testing Laboratories and Services

    $2.9B tracked federal contract value · 32 contractors

  92. 92
    517110

    Wired Telecommunications Carriers

    $2.9B tracked federal contract value · 12 contractors

  93. 93
    334517

    Irradiation Apparatus Manufacturing

    $2.9B tracked federal contract value · 16 contractors

  94. 94
    336350

    Motor Vehicle Transmission and Power Train Parts Manufacturing

    $2.9B tracked federal contract value · 7 contractors

  95. 95
    326211

    Tire Manufacturing (except Retreading)

    $2.8B tracked federal contract value · 8 contractors

  96. 96
    334118

    Computer Terminal and Other Computer Peripheral Equipment Manufacturing

    $2.6B tracked federal contract value · 4 contractors

  97. 97
    541211

    Offices of Certified Public Accountants

    $2.5B tracked federal contract value · 11 contractors

  98. 98
    611519

    Other Technical and Trade Schools

    $2.5B tracked federal contract value · 11 contractors

  99. 99
    334513

    Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables

    $2.4B tracked federal contract value · 2 contractors

  100. 100
    314999

    All Other Miscellaneous Textile Product Mills

    $2.4B tracked federal contract value · 7 contractors

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