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The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.

The North American Industry Classification System (NAICS) was developed in 1991 as a cooperative effort by the United States, Canada and Mexico in order to maintain consistency in industry coding and comparing economies of the three North American Free Trade Agreement (NAFTA) partners across North America.

 NAICS Code:  NAICS Title:  NAICS Description:
Utilities
221111 Hydroelectric Power Generation This U.S. industry comprises establishments primarily engaged in operating hydroelectric power generation facilities. These facilities use water power to drive a turbine and produce electric energy. 
221112 Fossil Fuel Electric Power Generation This U.S. industry comprises establishments primarily engaged in operating fossil fuel powered electric power generation facilities.
221113 Nuclear Electric Power Generation This U.S. industry comprises establishments primarily engaged in operating nuclear electric power generation facilities. These facilities use nuclear power to produce electric energy. 
221119 Other Electric Power Generation This U.S. industry comprises establishments primarily engaged in operating electric power generation facilities (except hydroelectric, fossil fuel, nuclear)
221121 Electric Bulk Power Transmission This U.S. industry comprises establishments primarily engaged in operating electric power transmission systems and/or controlling (i.e., regulatory voltage) the transmission of electricity from the generating source to distribution centers.
221122 Electric Power Distribution This U.S. industry comprises electric power establishments primarily engaged in (1) operating electric power distribution systems (i.e., consisting of lines, poles, meters, and wiring) or (2) operating as electric power brokers or agents that arrange the 
221210 Natural Gas Distribution This industry comprises: (1) establishments primarily engaged in operating gas distribution systems (e.g., mains, meters); (2) establishments known as gas marketers that buy gas from the well and sell it to a distribution system; (3) establishments known as brokers, or agents (4) establishments primarily engaged in transmitting and distributing gas to final consumers.
221310 Water Supply and Irrigation Systems This industry comprises establishments primarily engaged in operating water treatment plants and/or operating water supply systems. The water supply system may include pumping stations, aqueducts, and/or distribution mains. The water may be used for drink.
221320 Sewage Treatment Facilities This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.
221330 Steam and Air-Conditioning Supply This industry comprises establishments primarily engaged in providing steam, heated air, or cooled air. The steam distribution may be through mains.
Construction
237130 Power/Communication System Construction This industry comprises establishments primarily engaged in the construction of power lines and towers, power plants, and radio, television, and telecommunications transmitting/receiving towers. 
237990 Other Heavy Construction This industry comprises establishments primarily engaged in heavy and engineering construction projects (excluding highway, street, bridge, and distribution line construction). 
238211 Residential Electrical Contractors This BLS industry comprises establishments primarily engaged in installing and servicing electrical wiring and equipment in residential buildings.
238212 Nonresidential Electrical Contractors This BLS industry comprises establishments primarily engaged in installing and servicing electrical wiring and equipment in nonresidential buildings. 
238221 Residential Plumbing/HVAC Contractors This BLS industry comprises establishments primarily engaged in installing and servicing residential plumbing, heating, and air-conditioning equipment.  Residential contractors in this industry may provide both parts and labor when performing work.  
238222 Nonresidential Plumbing/HVAC Contractors This BLS industry comprises establishments primarily engaged in installing and servicing nonresidential plumbing, heating, and air-conditioning equipment.  Nonresidential contractors in this industry may provide both parts and labor when performing work. 
Biofuels - Ethanol
325193 Ethyl Alcohol Manufacturing This U.S. industry comprises establishments primarily engaged in manufacturing nonpotable ethyl alcohol.
Biofuels - Biodiesel
325110 Petrochemical Manufacturing This industry comprises establishments primarily engaged in (1) manufacturing acyclic (i.e., aliphatic) hydrocarbons such as ethylene, propylene, and butylene made from refined petroleum or liquid hydrocarbon and/or (2) manufacturing cyclic aromatic hydro  (creates aloholic hydrocarbons)
324191 All Other Petroleum and Coal Products This U.S. industry comprises establishments primarily engaged in blending or compounding refined petroleum to make lubricating oils and greases and/or re-refining used petroleum lubricating oils. (petroleum production combining with vegieable oil)
324199 All Other Petroleum and Coal Products This U.S. industry comprises establishments primarily engaged in manufacturing petroleum products (except asphalt paving, roofing, and saturated materials and lubricating oils and greases) from refined petroleum and coal products made in coke ovens (blending petroleum with vegetable oil)
Energy Related Manufacturing 
325188 All Other Basic Inorganic Chemicals This U.S. industry comprises establishments primarily engaged in manufacturing basic inorganic chemicals  (Nuclear fuel)
333414 Heating Equipment, ex. Warm Air Furnaces This U.S. industry comprises establishments primarily engaged in manufacturing heating equipment (except electric and warm air furnaces), such as heating boilers, heating stoves, floor and wall furnaces, and wall and baseboard heating units.
333415 AC, Refrigeration, & Forced Air Heating This U.S. industry comprises establishments primarily engaged in (1) manufacturing air- conditioning (except motor vehicle) and warm air furnace equipment and/or (2) manufacturing commercial and industrial refrigeration and freezer equipment.
333611 Turbine Generator & Generator Set Units This U.S. industry comprises establishments primarily engaged in manufacturing turbines (except aircraft); and complete turbine generator set units, such as steam, hydraulic, gas, and wind.
335121 Residential Electric Lighting Fixtures This U.S. industry comprises establishments primarily engaged in manufacturing fixed or portable residential electric lighting fixtures and lamp shades of metal, paper, or textiles. Residential electric lighting fixtures include those for use both inside 
335122 Nonresidential Electric Lighting Fixture This U.S. industry comprises establishments primarily engaged in manufacturing commercial, industrial, and institutional electric lighting fixtures.
335311 Electric Power & Specialty Transformers This U.S. industry comprises establishments primarily engaged in manufacturing power, distribution, and specialty transformers (except electronic components). Industrial-type and consumer-type transformers in this industry vary (e.g., step up or step down
335312 Motor and Generator Manufacturing This U.S. industry comprises establishments primarily engaged in manufacturing electric motors (except internal combustion engine starting motors), power generators (except battery charging alternators for internal combustion engines), and motor generator sets.
335313 Switchgear and Switchboard Apparatus This U.S. industry comprises establishments primarily engaged in manufacturing switchgear and switchboard apparatus.
335314 Relay & Industrial Control Manufacturing This U.S. industry comprises establishments primarily engaged in manufacturing relays, motor starters and controllers, and other industrial controls and control accessories.
335999 Miscellaneous Electrical Equipment This U.S. industry comprises establishments primarily engaged in manufacturing industrial and commercial electric apparatus and other equipment (except lighting equipment, household appliances, transformers, motors, generators, switchgear, relays, industrial controls, etc.
Energy Related Business Services
541330 Engineering Services This industry comprises establishments primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems. 
541380 Testing Laboratories This industry comprises establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing.
541690 Other Technical Consulting Services This industry comprises establishments primarily engaged in providing advice and assistance to businesses and other organizations on scientific and technical issues (except environmental).
Waste Services
562213 Solid Waste Combustors and Incinerators This U.S. industry comprises establishments primarily engaged in operating combustors and incinerators for the disposal of nonhazardous solid waste. These establishments may produce byproducts, such as electricity and steam. 
Repair Services
811219 Other Electronic Equipment Repair This U.S. industry comprises establishments primarily engaged in repairing and maintaining (without retailing) electronic and precision equipment (except consumer electronics, computers and office machines, and communications equipment). 
811310 Commercial Machinery Repair/Maintenance This industry comprises establishments primarily engaged in the repair and maintenance of commercial and industrial machinery and equipment. Establishments in this industry either sharpen/install commercial and industrial machinery blades and saws.
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