| 5122 | Raw sugar, wholesale | |
| 1911 | Rawhide, manufacturing | |
| 0500 | Ray fishing | |
| 1711 | Rayon fabrics, broad-woven, weaving | |
| 2430 | Rayon fibres and filaments, manufacturing | |
| 5131 | Rayon piece goods, wholesale | |
| 1711 | Rayon spun yarns, made from purchased fibre | |
| 1711 | Rayon thread, manufacturing | |
| 1711 | Rayon tops, combing and converting | |
| 1711 | Rayon yarn, throwing, twisting, texturizing or winding purchased filament | |
| 5131 | Rayon yarns, wholesale | |
| 2710 | Razor blade strip steel, made from purchased steel | |
| 2893 | Razor blades, manufacturing | |
| 5139 | Razor blades, wholesale | |
| 1912 | Razor strops, manufacturing | |
| 2893 | Razors (except electric), manufacturing | |
| 5139 | Razors (except electric), wholesale | |
| 5139 | Razors and blades, non-electric, wholesale | |
| 2930 | Razors, electric, manufacturing | |
| 5139 | Razors, electric, wholesale | |
| 2813 | Reactor containment vessels, fabricated metal plate, manufacturing | |
| 3110 | Reactors, current limiting, manufacturing | |
| 2813 | Reactors, nuclear, manufacturing | |
| 3320 | Readers, microfilm or microfiche, manufacturing | |
| 9231 | Reading rooms, promoting a religion | |
| 8090 | Reading schools | |
| 3410 | Ready-mix concrete trucks, assembling on purchased chassis | |
| 2695 | Ready-mixed concrete manufacturing and distribution | |
| 1531 | Ready-to-serve breakfast cereal foods, manufacturing | |
| 5232 | Ready-to-wear stores, women's, retail | |
| 7020 | Real estate advisory services | |
| 7020 | Real estate agencies | |
| 7020 | Real estate agents, brokers and managers | |
| 7020 | Real estate appraisers | |
| 7020 | Real estate auction | |
| 9111 | Real estate boards | |
| 7020 | Real estate brokerage | |
| 7020 | Real estate brokers | |
| 7020 | Real estate business | |
| 7020 | Real estate consulting and appraisals | |