NAICS Code Descriptions
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| 22 | Utilities |
| 221111 | Hydroelectric Power Generation |
| 221112 | Fossil Fuel Electric Power Generation |
| 221113 | Nuclear Electric Power Generation |
| 221119 | Other Electric Power Generation |
| 221121 | Electric Bulk Power Transmission and Control |
| 221122 | Electric Power Distribution |
| 221210 | Natural Gas Distribution |
| 221310 | Water Supply and Irrigation Systems |
| 221320 | Sewage Treatment Facilities |
| 221330 | Steam and Air-Conditioning Supply |
| 23 | Construction |
| 236115 | New Single-Family Housing Construction (except Operative Builders) |
| 236116 | New Multifamily Housing Construction (except Operative Builders) |
| 236117 | New Housing Operative Builders |
| 236118 | Residential Remodelers |
| 236210 | Industrial Building Construction |
| 236220 | Commercial and Institutional Building Construction |
| 237110 | Water and Sewer Line and Related Structures Construction |
| 237120 | Oil and Gas Pipeline and Related Structures Construction |
| 237130 | Power and Communication Line and Related Structures Construction |
| 237210 | Land Subdivision |
| 237310 | Highway, Street, and Bridge Construction |
| 237990 | Other Heavy and Civil Engineering Construction |
| 238110 | Poured Concrete Foundation and Structure Contractors |
| 238120 | Structural Steel and Precast Concrete Contractors |
| 238130 | Framing Contractors |
| 238140 | Masonry Contractors |
| 238150 | Glass and Glazing Contractors |
| 238160 | Roofing Contractors |
| 238170 | Siding Contractors |
| 238190 | Other Foundation, Structure, and Building Exterior Contractors |
| 238210 | Electrical Contractors |
| 238220 | Plumbing, Heating, and Air-Conditioning Contractors |
| 238290 | Other Building Equipment Contractors |
| 238310 | Drywall and Insulation Contractors |
| 238320 | Painting and Wall Covering Contractors |
| 238330 | Flooring Contractors |
| 238340 | Tile and Terrazzo Contractors |
| 238350 | Finish Carpentry Contractors |
| 238390 | Other Building Finishing Contractors |
| 238910 | Site Preparation Contractors |
| 238990 | All Other Specialty Trade Contractors |
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