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| 9900 | Organization of African Unity | |
| 9900 | Organization of American States | |
| 9900 | Organization of Oil Producing and Exporting Countries | |
| 2520 | Organizers for closets, drawers and shelves, plastics, manufacturing | |
| 2411 | Organo-inorganic compounds, manufacturing | |
| 2421 | Organo-phosphate base insecticides, manufacturing | |
| 3692 | Organs, all types (e.g., pipe, reed, hand, street, barrel, electronic, player), manufacturing | |
| 3692 | Organs, manufacturing | |
| 5233 | Organs, retail | |
| 5139 | Organs, wholesale | |
| 2021 | Oriented strandboard (OSB), manufacturing | |
| 2695 | Ornamental and architectural plaster work (e.g., columns, mantels, mouldings), manufacturing | |
| 5143 | Ornamental iron and steel products, wholesale | |
| 4540 | Ornamental iron and steel work, construction | |
| 4540 | Ornamental metal work, installation, contractors | |
| 2811 | Ornamental metal work, manufacturing | |
| 0112 | Ornamental plant growing | |
| 5121 | Ornamental plants and flowers, wholesale | |
| 0112 | Ornamental shrubs, nursery grown | |
| 4520 | Ornamental stone, installation | |
| 0200 | Ornamental trees, nursery grown | |
| 2022 | Ornamental woodwork (e.g., cornices, mantels), manufacturing | |
| 3699 | Ornaments, Christmas tree (except glass and electric), manufacturing | |
| 3190 | Ornaments, Christmas tree, electric, manufacturing | |
| 2610 | Ornaments, Christmas tree, glass, made in glass making plants | |
| 2610 | Ornaments, Christmas tree, made from purchased glass | |
| 2695 | Ornaments, concrete lawn and garden, manufacturing | |
| 3699 | Ornaments, costume, manufacturing | |
| 3699 | Ornaments, n.e.s., manufacturing | |
| 1920 | Ornaments, shoe, manufacturing | |
| 8531 | Orphanages | |
| 7523 | Orphans' courts | |
| 1421 | Orpiment mining | |
| 2429 | Orris oil, manufacturing | |
| 2411 | Orthodichlorobenzene, manufacturing | |
| 3311 | Orthodontic appliances, custom made in dental laboratories | |
| 8512 | Orthodontists' offices of | |
| 9191 | Orthodox church | |
| 5231 | Orthopaedic aids, retail | |
| 5139 | Orthopaedic equipment and supplies, wholesale | |
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