| SIC code | SIC Text
| NAICS code | NAICS Text
|
| Null Set for U.S. | 112130 | Dual Purpose Cattle Ranching and Farming |
| 1321 | Natural Gas Liquids | 211112 | Natural Gas Liquid Extraction |
| 1481 | Nonmetallic Minerals Services, Except Fuels (except geophysical surveying and mapping) | 213115 | Support Activities for Nonmetallic Minerals (except Fuels) |
| 4923 | Natural Gas Transmission and Distribution (distribution) | 221210 | Natural Gas Distribution |
| 4924 | Natural Gas Distribution | 221210 | Natural Gas Distribution |
| 2022 | Natural, Processed, and Imitation Cheese | 311513 | Cheese Manufacturing |
| 2241 | Narrow Fabric and Other Smallware Mills: Cotton, Wool, Silk and Manmade Fiber | 313221 | Narrow Fabric Mills |
| 2297 | Nonwoven Fabrics | 313230 | Nonwoven Fabric Mills |
| 2441 | Nailed and Lock Corner Wood Boxes and Shook | 321920 | Wood Container and Pallet Manufacturing |
| 2873 | Nitrogenous Fertilizers | 325311 | Nitrogenous Fertilizer Manufacturing |
| 3299 | Nonmetallic Mineral Products, NEC (clay statuary) | 327112 | Vitreous China, Fine Earthenware, and Other Pottery Product Manufacturing |
| 3297 | Nonclay Refractories | 327125 | Nonclay Refractory Manufacturing |
| 3299 | Nonmetallic Mineral Products, NEC (moldings, ornamental and architectural plaster work and gypsum statuar | 327420 | Gypsum Product Manufacturing |
| 3299 | Nonmetallic Mineral Products, NEC (except moldings, ornamental and architectural plaster work, clay and g | 327999 | All Other Miscellaneous Nonmetallic Mineral Product Manufacturing |
| 3364 | Nonferrous Die-Castings, Except Aluminum | 331522 | Nonferrous (except Aluminum) Die-Casting Foundries |
| 3369 | Nonferrous Foundries, Except Aluminum and Copper | 331528 | Other Nonferrous Foundries (except Die-Casting) |
| 3463 | Nonferrous Forgings | 332112 | Nonferrous Forging |
| 3644 | Noncurrent-Carrying Wiring Devices (fish wire, electrical wiring tool) | 332212 | Hand and Edge Tool Manufacturing |
| 3644 | Noncurrent-Carrying Wiring Devices (except fishwire, electrical wiring tool) | 335932 | Noncurrent-Carrying Wiring Device Manufacturing |
| 5199 | Nondurable Goods, NEC (except specialty advertising) | 422990 | Other Miscellaneous Nondurable Goods Wholesalers |
| 5994 | News Dealers and Newsstands | 451212 | News Dealers and Newsstands |
| 4922 | Natural Gas Transmission | 486210 | Pipeline Transportation of Natural Gas |
| 4923 | Natural Gas Transmission and Distribution (transmission) | 486210 | Pipeline Transportation of Natural Gas |
| 2711 | Newspapers: Publishing, or Publishing and Printing | 511110 | Newspaper Publishers |
| 7383 | News Syndicates (except independent news correspondents) | 514110 | News Syndicates |
| 6021 | National Commercial Banks (banking) | 522110 | Commercial Banking |
| 6021 | National Commercial Banks (credit card issuing) | 522210 | Credit Card Issuing |
| 6091 | Nondeposit Trust Facilities | 523991 | Trust, Fiduciary, and Custody Activities |
| Null Set for U.S. | 541120 | Offices of Notaries |
| 1481 | Nonmetallic Minerals Services, Except Fuels (geophysical surveying and mapping) | 541360 | Geophysical Surveying and Mapping Services |
| 8733 | Noncommercial Research Organizations (physical, engineering and life sciences) | 541710 | Research and Development in the Physical, Engineering, and Life Sciences |
| 8733 | Noncommercial Research Organizations (social sciences and humanities) | 541720 | Research and Development in the Social Sciences and Humanities |
| 5199 | Nondurable Goods, NEC (advertising specialities goods distributors) | 541890 | Other Services Related to Advertising |
| 8059 | Nursing and Personal Care Facilities, NEC (except continuing care retirement communities) | 623110 | Nursing Care Facilities |
| 8059 | Nursing and Personal Care Facilities, NEC (continuing care retirement communities) | 623311 | Continuing Care Retirement Communities |
| 7383 | News Syndicates (independent news correspondents) | 711510 | Independent Artists, Writers, and Performers |
| 9711 | National Security | 928110 | National Security |
