| NAICS code | NAICS Text
| SIC code | SIC Text
|
| 111330 | Noncitrus Fruit and Tree Nut Farming | | |
| 111420 | Nursery and Floriculture Production | | |
| 111421 | Nursery and Tree Production | 0181 | Ornamental Floriculture and Nursery Products (nursery farming) |
| 111421 | Nursery and Tree Production | 0811 | Timber Tracts (short rotation woody crops) |
| 211112 | Natural Gas Liquid Extraction | 1321 | Natural Gas Liquids |
| 211112 | Natural Gas Liquid Extraction | 2819 | Industrial Inorganic Chemicals, NEC (recovering sulfur from natural gas) |
| 2123 | Nonmetallic Mineral Mining and Quarrying | | |
| 221113 | Nuclear Electric Power Generation | 4911 | Electric Services (nuclear electric power generation) |
| 221113 | Nuclear Electric Power Generation | 4931 | Electric and Other Services Combined (nuclear power generation) |
| 221113 | Nuclear Electric Power Generation | 4939 | Combination Utilities, NEC (nuclear power generation) |
| 2212 | Natural Gas Distribution | | |
| 221210 | Natural Gas Distribution | 4923 | Natural Gas Transmission and Distribution (distribution) |
| 221210 | Natural Gas Distribution | 4924 | Natural Gas Distribution |
| 221210 | Natural Gas Distribution | 4925 | Mixed, Manufactured, or Liquefied Petroleum Gas Production and/or Distribution |
| 221210 | Natural Gas Distribution | 4931 | Electric and Other Services Combined (natural gas distribution) |
| 221210 | Natural Gas Distribution | 4932 | Gas and Other Services Combined (natural gas distribution) |
| 221210 | Natural Gas Distribution | 4939 | Combination Utilities, NEC (natural gas distribution) |
| 2333 | Nonresidential Building Construction | | |
| 311340 | Nonchocolate Confectionery Manufacturing | 2064 | Candy and Other Confectionery Products (nonchocolate confectionery ) |
| 311340 | Nonchocolate Confectionery Manufacturing | 5441 | Candy, Nut, and Confectionery Stores (nonchocolate candy stores, preparing on premises) |
| 311340 | Nonchocolate Confectionery Manufacturing | 2067 | Chewing Gum |
| 311340 | Nonchocolate Confectionery Manufacturing | 2099 | Food Preparations, NEC (marshmallow creme) |
| 313220 | Narrow Fabric Mills and Schiffli Machine Embroidery | | |
| 313221 | Narrow Fabric Mills | 2241 | Narrow Fabric and Other Smallware Mills: Cotton, Wool, Silk and Manmade Fiber |
| 313221 | Narrow Fabric Mills | 2299 | Textile Goods, NEC (narrow woven fabric of jute, linen, hemp, and ramie) |
| 313230 | Nonwoven Fabric Mills | 2297 | Nonwoven Fabrics |
| 313230 | Nonwoven Fabric Mills | 2299 | Textile Goods, NEC (nonwoven felt) |
| 322122 | Newsprint Mills | 2621 | Paper Mills (newsprint mills) |
| 322122 | Newsprint Mills | 2611 | Pulp Mills (pulp mills producing newsprint) |
| 322215 | Nonfolding Sanitary Food Container Manufacturing | 2656 | Sanitary Food Containers, Except Folding |
| 325222 | Noncellulosic Organic Fiber Manufacturing | 2824 | Manmade Organic Fibers, Except Cellulosic |
| 325311 | Nitrogenous Fertilizer Manufacturing | 2873 | Nitrogenous Fertilizers |
| 327 | Nonmetallic Mineral Product Manufacturing | | |
| 327125 | Nonclay Refractory Manufacturing | 3297 | Nonclay Refractories |
| 3314 | Nonferrous Metal (except Aluminum) Production and Processing | | |
| 331410 | Nonferrous Metal (except Aluminum) Smelting and Refining | | |
| 331490 | Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, Extruding, and Alloying | | |
| 331491 | Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, and Extruding | 3356 | Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum |
| 331491 | Nonferrous Metal (except Copper and Aluminum) Rolling, Drawing, and Extruding | 3357 | Drawing and Insulating of Nonferrous Wire (wire drawing except copper or aluminum) |
| 331520 | Nonferrous Metal Foundries | | |
| 331522 | Nonferrous (except Aluminum) Die-Casting Foundries | 3364 | Nonferrous Die-Castings, Except Aluminum |
| 332112 | Nonferrous Forging | 3463 | Nonferrous Forgings |
| 3345 | Navigational, Measuring, Electromedical, and Control Instruments Manufacturing | | |
| 334510 | Navigational, Measuring, Electromedical, and Control Instruments Manufacturing | | |
| 335932 | Noncurrent-Carrying Wiring Device Manufacturing | 3644 | Noncurrent-Carrying Wiring Devices (except fishwire, electrical wiring tool) |
| 337122 | Nonupholstered Wood Household Furniture Manufacturing | 2511 | Wood Household Furniture, Except Upholstered (except wood box spring frames) |
| 337122 | Nonupholstered Wood Household Furniture Manufacturing | 5712 | Furniture Stores (custom made wood nonupholstered household furniture except cabinets) |
| 441110 | New Car Dealers | 5511 | Motor Vehicle Dealers (New and Used) |
| 444220 | Nursery and Garden Centers | 5191 | Farm Supplies (sold via retail method) |
| 444220 | Nursery and Garden Centers | 5193 | Flowers, Nursery Stock, and Florists' Supplies (sold via retail method) |
| 444220 | Nursery and Garden Centers | 5261 | Retail Nurseries, Lawn and Garden Supply Stores (except outdoor power equipment) |
| 451212 | News Dealers and Newsstands | 5994 | News Dealers and Newsstands |
| 454 | Nonstore Retailers | | |
| 4812 | Nonscheduled Air Transportation | | |
| 481210 | Nonscheduled Air Transportation | | |
| 481211 | Nonscheduled Chartered Passenger Air Transportation | 4522 | Air Transportation, Nonscheduled (passenger) |
| 481212 | Nonscheduled Chartered Freight Air Transportation | 4522 | Air Transportation, Nonscheduled (freight) |
| 488330 | Navigational Services to Shipping | 4492 | Towing and Tugboat Services |
| 488330 | Navigational Services to Shipping | 4499 | Water Transportation Services, NEC (piloting vessels in and out of harbors and marine salvage) |
| 5111 | Newspaper, Periodical, Book, and Database Publishers | | |
| 511110 | Newspaper Publishers | 2711 | Newspapers: Publishing, or Publishing and Printing |
| 514110 | News Syndicates | 7383 | News Syndicates (except independent news correspondents) |
| 5222 | Nondepository Credit Intermediation | | |
| 531312 | Nonresidential Property Managers | 6531 | Real Estate Agents and Managers (managers-nonresidential, real estate) |
| 623 | Nursing and Residential Care Facilities | | |
| 6231 | Nursing Care Facilities | | |
| 623110 | Nursing Care Facilities | 8051 | Skilled Nursing Care Facilities (except continuing care retirement communities) |
| 623110 | Nursing Care Facilities | 8052 | Intermediate Care Facilities (except continuing care retirement communities and mental retardation facili |
| 623110 | Nursing Care Facilities | 8059 | Nursing and Personal Care Facilities, NEC (except continuing care retirement communities) |
| 712190 | Nature Parks and Other Similar Institutions | 7999 | Amusement and Recreation Services, NEC (caverns and miscellaneous commercial parks) |
| 712190 | Nature Parks and Other Similar Institutions | 8422 | Arboreta and Botanical or Zoological Gardens (nature parks and reserves) |
| 812113 | Nail Salons | 7231 | Beauty Shops (manicure and pedicure salons) |
| 928 | National Security and International Affairs | | |
| 9281 | National Security and International Affairs | | |
| 928110 | National Security | 9711 | National Security |