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2861-O01 ----- Oak extract-mfg
2299-O01 ----- Oakum-mfg
2499-O01 ----- Oars, wood-mfg
0119-O01 ----- Oat farms
2043-O01 ----- Oatmeal (cereal breakfast food)-mfg
2048-O01 ----- Oats: crimped, pulverized, and rolled: except breakfast food-mfg
2043-O02 ----- Oats, rolled (cereal breakfast food)-mfg
5153-O01 ----- Oats-wholesale
5932-O01 ----- Objects of art, antique-retail
3931-O01 ----- Oboes-mfg
7999-O01 ----- Observation tower operation
8011-O01 ----- Obstetricians, offices of
3931-O02 ----- Ocarinas-mfg
8049-O01 ----- Occupational therapists, offices of
1479-O01 ----- Ocher mining
2816-O01 ----- Ochers-mfg
8011-O02 ----- Oculists, offices of
3931-O03 ----- Ocyophones-mfg
3824-O01 ----- Odometers-mfg
3489-O01 ----- Oerlikon guns-mfg
3061-O01 ----- Off-highway machinery and equipment mechanical rubber goods: molded, extruded, and lathe-cut-mfg
7999-O02 ----- Off-track betting
8322-O01 ----- Offender rehabilitation agencies
8322-O02 ----- Offender self-help agencies
7373-O01 ----- Office automation, computer systems integration
1542-O01 ----- Office building construction-general contractors
7349-O01 ----- Office cleaning service
5044-000 ----- Office equipment-wholesale
2542-O01 ----- Office fixtures, except wood-mfg
2541-O01 ----- Office fixtures, wood-mfg
2522-O01 ----- Office furniture, except wood-mfg
5021-O01 ----- Office furniture-wholesale
2521-O01 ----- Office furniture, wood-mfg
7363-O01 ----- Office help supply service
3579-000 ----- Office machines, n.e.c.
7359-O01 ----- Office machine rental and leasing, except computers
7629-O01 ----- Office machine repair, electrical: except typewriters, computers, and computer peripheral equipment
8741-O01 ----- Office management services
5112-O01 ----- Office supplies-wholesale
8041-000 ----- Offices and clinics of chiropractors
8042-000 ----- Offices and clinics of optometrists
8043-000 ----- Offices and clinics of podiatrists
8021-000 ----- Offices of dentists
8049-000 ----- Offices of health practitioners, n.e.c.
8031-000 ----- Offices of osteopathic physicians
8011-000 ----- Offices of physicians
2893-O01 ----- Offset ink-mfg
2621-O01 ----- Offset paper-mitse-mfg
2796-O01 ----- Offset plates, positives or negatives: preparation of-mfg
2752-O01 ----- Offset printing-mfg
3731-O01 ----- Offshore supply boats, building and repairing-mfg
3825-O01 ----- Ohmmeters-mfg
2911-O01 ----- Oil, acid: produced in petroleum refineries-mfg
5169-O01 ----- Oil additives-wholesale
1382-000 ----- Oil and gas exploration services
3533-000 ----- Oil and gas field machinery-mfg
3061-O02 ----- Oil and gas field machinery and equipment mechanical rubber goods: molded, extruded, and lathe-cut-mfg
3533-O01 ----- Oil and gas field machinery and equipment-mfg
1389-000 ----- Oil and gas field services, n.e.c.
6211-O01 ----- Oil and gas lease brokers
4226-O01 ----- Oil and gasoline storage caverns for hire
2077-O01 ----- Oil and meal, fish-mfg
2866-O01 ----- Oil, aniline-mfg
3433-O01 ----- Oil burners, domestic and industrial-mfg
5074-O01 ----- Oil burners-wholesale
3411-O01 ----- Oil cans, metal-mfg
2046-O01 ----- Oil, corn: crude and refined-mfg
2074-O01 ----- Oil, cottonseed-mfg
2865-O01 ----- Oil, creosote: product of coal tar distillation-mfg
1311-O01 ----- Oil (crude) production
3599-O01 ----- Oil cups, metal-mfg
5169-O02 ----- Oil drilling muds-wholesale
7359-O02 ----- Oil field equipment rental and leasing
1382-O01 ----- Oil field exploration: on a contract basis
3599-O02 ----- Oil filters, internal combustion engine: except motor vehicle-mfg
3714-O01 ----- Oil filters, motor vehicle-mfg
2079-O01 ----- Oil, hydrogenated: edible-mfg
5159-O01 ----- Oil kernels-wholesale
6792-O01 ----- Oil leases, buying and selling on own account
3586-O01 ----- Oil measuring and dispensing pumps-mfg
5159-O02 ----- Oil nuts-wholesale
2079-O02 ----- Oil, olive-mfg
2851-O01 ----- Oil paints-mfg
2079-O03 ----- Oil, partially hydrogenated: edible-mfg
2861-O02 ----- Oil, pine: produced by distillation of pine gum or pine wood-mfg
3829-O01 ----- Oil pressure gauges, motor vehicle-mfg
6519-O01 ----- Oil properties, lessors of
2899-O01 ----- Oil, red (oleic acid)-mfg
1629-O01 ----- Oil refinery construction-general contractors
5084-O01 ----- Oil refining machinery, equipment, and supplies-wholesale
6211-O02 ----- Oil royalties, dealers in
6792-O02 ----- Oil royalty companies
1389-O01 ----- Oil sampling service for oil companies on a contract basis
1311-O02 ----- Oil sand mining
3053-O01 ----- Oil seals, asbestos-mfg
3053-O02 ----- Oil seals, leather-mfg
3053-O03 ----- Oil seals, rubber-mfg
1311-O03 ----- Oil shale mining
2075-O01 ----- Oil, soybean-mfg
4959-O01 ----- Oil spill cleanup
2851-O02 ----- Oil stains-mfg
2911-O02 ----- Oil still gas, produced in petroleum refineries-mfg
3443-O01 ----- Oil storage tanks, metal plate-mfg
2899-O02 ----- Oil treating compounds-mfg
2843-O01 ----- Oil, turkey red-mfg
2079-O04 ----- Oil, vegetable winter stearin-mfg
5093-O01 ----- Oil, waste-wholesale
7359-O03 ----- Oil well drilling equipment rental and leasing
1381-O01 ----- Oil well drilling: on a contract basis
1389-O02 ----- Oil well logging on a contract basis
5084-O02 ----- Oil well machinery, equipment, and supplies-wholesale
1389-O03 ----- Oil well rig building, repairing, and dismantling: on a contract basis
5084-O03 ----- Oil well supply houses-wholesale
2295-O01 ----- Oilcloth-mfg
2672-O01 ----- Oiled paper-mfpm-mfg
2077-O02 ----- Oils, animal-mfg
2844-O01 ----- Oils, cosmetic-mfg
2899-O03 ----- Oils, essential-mfg
5199-O01 ----- Oils, except cooking: animal and vegetable-wholesale
2077-O03 ----- Oils, fish and marine animal: e.g., herring, menhaden, whale (refined), sardine-mfg
2077-O04 ----- Oils, fish and marine animal: herring, menhaden, whale (refined), sardine-mfg
2911-O03 ----- Oils: fuel, lubricating, and illuminating-produced in petroleum refineries-mfg
2865-O02 ----- Oils: light, medium, and heavy: made in chemical plants-mfg
2992-O01 ----- Oils, lubricating-mfpm-mfg
2992-O02 ----- Oils, lubricating: re-fining-mfg
2911-O04 ----- Oils, partly refined: sold for rerunning-produced in petroleum refineries-mfg
2843-O02 ----- Oils, soluble (textile assistants)-mfg
2843-O03 ----- Oils, sulfonated-mfg
2833-O01 ----- Oils, vegetable and animal: medicinal grade-refined and concentrated-mfg
2076-O01 ----- Oils, vegetable: except corn, cottonseed, and soybean-mfg
2079-O05 ----- Oils, vegetable (except corn oil) refined:cooking and salad-mfg
2861-O03 ----- Oils, wood: product of hardwood distillation-mfg
5199-O02 ----- Oilseed cake and meal-wholesale
3556-O01 ----- Oilseed crushing and extracting machinery-mfg
5159-O03 ----- Oilseeds-wholesale
1499-O01 ----- Oilstone quarrying
3291-O01 ----- Oilstones, artificial-mfg
2834-O01 ----- Ointments-mfg
2076-O02 ----- Oiticica oil-mfg
8322-O03 ----- Old age assistance
8361-O01 ----- Old soldiers, homes
2851-O03 ----- Oleate driers-mfg
2824-O01 ----- Olefin fibers-mfg
2869-O01 ----- Oleic acid esters-mfg
2899-O04 ----- Oleic acid (red oil)-mfg
3728-O01 ----- Oleo struts, aircraft-mfg
2819-O01 ----- Oleum (fuming sulfuric acid)-mfg
0179-O01 ----- Olive groves and farms
2079-O06 ----- Olive oil-mfg
2035-O01 ----- Olives, brined: bulk-mfg
2034-O01 ----- Olives, dried-mfg
2033-O01 ----- Olives, including stuffed: canned-mfg
1459-O01 ----- Olivine (nongem) mining
3812-O01 ----- Omnibearing instrumentation-mfg
7375-O01 ----- On-line data base information retrieval services
2749-O01 ----- Online, publishing and printing, or publishing only
1521-O01 ----- One-family house construction-general contractors
0161-O01 ----- Onion farms
2035-O02 ----- Onions, pickled-mfg
1429-O01 ----- Onyx marble, crushed and broken-quarrying
1411-O01 ----- Onyx marble, dimension-quarrying
3211-O01 ----- Opalescent flat glass-mfg
2211-O01 ----- Opaline, cotton-mfg
7833-O01 ----- Open air motion picture theaters
3496-O01 ----- Openers, bottle: made from purchased wire-mfg
7922-O01 ----- Opera companies
3827-O01 ----- Opera glasses-mfg
2353-O01 ----- Opera hats-mfg
7372-O01 ----- Operating systems software, computer: prepackaged
3841-O01 ----- Operating tables-mfg
7373-O02 ----- Operations research, computer systems design
8742-O01 ----- Operations research consultants
1531-000 ----- Operative builders
1531-O01 ----- Operative builders on own account
6513-O01 ----- Operators of apartment buildings (five or more housing units)
6513-O02 ----- Operators of apartment hotels
6512-O01 ----- Operators of commercial and industrial buildings
6514-O01 ----- Operators of dwellings (four or fewer housing units)
6515-O01 ----- Operators of mobile home sites
6512-O02 ----- Operators of nonresidential buildings
6514-O02 ----- Operators of residential buildings (four or fewer housing units)
6513-O03 ----- Operators of residential hotels
6513-O04 ----- Operators of retirement hotels
3229-O01 ----- Ophthalmic glass, except flat-mfg
3211-O02 ----- Ophthalmic glass, flat-mfg
3851-000 ----- Ophthalmic goods-mfg
5048-O01 ----- Ophthalmic goods-wholesale
3841-O02 ----- Ophthalmic instruments and apparatus-mfg
3229-O02 ----- Ophthalmic lens blanks-mfg
3851-O01 ----- Ophthalmic lens grinding, except prescription-mfg
8011-O03 ----- Ophthalmologists, offices of
3841-O03 ----- Ophthalmometers and ophthalmoscopes-mfg
8732-O01 ----- Opinion research, commercial
2833-O02 ----- Opium derivatives-mfg
3827-O02 ----- Optical alignment and display instruments, except photographic-mfg
3827-O03 ----- Optical comparators-mfg
3695-O01 ----- Optical disks and tape, blank-mfg
3229-O03 ----- Optical glass blanks-mfg
3211-O03 ----- Optical glass, flat-mfg
5995-O01 ----- Optical goods-retail
3851-O02 ----- Optical grinding service for the trade-mfg
3832-000 ----- Optical instruments and lenses-mfg
3674-O01 ----- Optical isolators-mfg
3229-O04 ----- Optical lens blanks-mfg
3559-O01 ----- Optical lens machinery-mfg
3577-O01 ----- Optical readers and scanners-mfg
7374-O01 ----- Optical scanning data service
3577-O02 ----- Optical scanning devices, computer peripheral equipment-mfg
3572-O01 ----- Optical storage devices for computers
3827-O04 ----- Optical test and inspection equipment-mfg
5995-O02 ----- Opticians-retail
6211-O03 ----- Option dealers, stock
6231-O01 ----- Option exchanges, stock
3841-O04 ----- Optometers-mfg
5048-O02 ----- Optometric equipment and supplies-wholesale
8042-O01 ----- Optometrists, offices and clinics of
8021-O01 ----- Oral pathologists, offices of
0174-O01 ----- Orange groves and farms
2899-O05 ----- Orange oil-mfg
0721-O01 ----- Orchard cultivation services
0762-O01 ----- Orchard management and maintenance, with or without crop services
7929-O01 ----- Orchestras
5961-O01 ----- Order taking offices of mail-order houses-retail
3489-000 ----- Ordnance and accessories, n.e.c.-mfg
3462-O01 ----- Ordnance forgings, ferrous: not made in rolling mills-mfg
3463-O01 ----- Ordnance forgings, nonferrous: not made in hot-rolling mills-mfg
3569-O01 ----- Ordnance testing chambers-mfg
3532-O01 ----- Ore and aggregate feeders-mfg
3532-O02 ----- Ore crushing, washing, screening, and loading machinery-mfg
3429-O01 ----- Organ hardware-mfg
3931-O04 ----- Organ parts and materials, except organ hardware-mfg
7699-O01 ----- Organ tuning and repair
2211-O02 ----- Organdy, cotton-mfg
2869-O02 ----- Organic acid esters-mfg
2869-O03 ----- Organic chemicals, acyclic-mfg
5169-O03 ----- Organic chemicals, synthetic-wholesale
2865-O03 ----- Organic colors, full strength-mfg
2824-O02 ----- Organic fibers, synthetic: except cellulosic-mfg
2833-O03 ----- Organic medicinal chemicals: bulk-mfg
2865-O04 ----- Organic pigrments (lakes and toners)-mfg
3089-O01 ----- Organizers for closets, drawers, and shelves: plastics-mfg
3931-O05 ----- Organs, all types: e.g., pipe, reed, hand, street, barrel, electronic, player-mfg
2493-O01 ----- Oriented strandboard-mfg
3446-O01 ----- Ornamental and architectural metalwork-mfg
3299-O01 ----- Ornamental and architectural plasterwork: e.g., mantels and columns-mfg
0783-O01 ----- Ornamental bush planting, pruning, bracing, spraying, removal, and surgery
1799-O01 ----- Ornamental metal work-contractors
0181-000 ----- Ornamental nursery products
0783-000 ----- Ornamental shrub and tree services
0783-O02 ----- Ornamental tree planting, pruning, bracing, spraying, removal, and surgery
2431-O01 ----- Ornamental woodwork: e.g., cornices and mantels-mfg
3231-O01 ----- Ornamented glass, made from purchased glass-mfg
3699-O01 ----- Ornaments, Christmas tree: electric-mfg
3999-O01 ----- Ornaments, Christmas tree: except glass and electric-mfg
3229-O05 ----- Ornaments, Christmas tree: glass-mitse-mfg
3231-O02 ----- Ornaments, Christmas tree: made from purchased glass-mfg
3961-O01 ----- Ornaments, costume: except precious metal and gems-mfg
3131-O01 ----- Ornaments, shoe-mfg
8361-O02 ----- Orphanages
2899-O06 ----- Orris oil-mfg
2865-O05 ----- Orthodichlorobenzene-mfg
8072-O01 ----- Orthodontic appliances made in dental laboratories to order for the profession
3843-O01 ----- Orthodontic appliances-mfg
8021-O02 ----- Orthodontists, offices of
5999-O01 ----- Orthopedic and artificial limb stores-retail
3842-O01 ----- Orthopedic devices and materials-mfg
5047-O01 ----- Orthopedic equipment-wholesale
3842-O02 ----- Orthopedic hosiery, elastic-mfg
8069-O01 ----- Orthopedic hospitals
8011-O04 ----- Orthopedic physicians, offices of
3275-O01 ----- Orthopedic plaster, gypsum-mfg
3149-O01 ----- Orthopedic shoes, children's: except extension shoes-mfg
3842-O03 ----- Orthopedic shoes, extension-mfg
3143-O01 ----- Orthopedic shoes, men's: except extension shoes-mfg
3144-O01 ----- Orthopedic shoes, women's: except extension shoes-mfg
3069-O01 ----- Orthopedic sundries, molded rubber-mfg
3825-O02 ----- Oscillators, audio frequency and radio frequency (instrument types)-mfg
3679-O01 ----- Oscillators, except laboratory type-mfg
3825-O03 ----- Oscillographs and oscilloscopes-mfg
1099-O01 ----- Osmium ore mining
3826-O01 ----- Osmometers-mfg
2211-O03 ----- Osnaburgs-mfg
2899-O07 ----- Ossein-mfg
8031-O01 ----- Osteopathic physicians, offices and clinics of
8099-O01 ----- Osteoperosis centers
3999-O02 ----- Ostrich feathers: curling, dyeing, and renovating for the trade-mfg
3845-O01 ----- Otoscopes, electromedical-mfg
3841-O05 ----- Otoscopes, except electromedical-mfg
5551-O01 ----- Outboard motor dealers-retail
3699-O02 ----- Outboard motors, electric-mfg
3519-O01 ----- Outboard motors, except electric-mfg
5091-O01 ----- Outboard motors-wholesale
7312-001 ----- Outdoor advertising service
5712-O01 ----- Outdoor furniture-retail
2253-O01 ----- Outerwear handknitted: for the trade-mfg
5136-O01 ----- Outerwear, men's and boys'-wholesale
5137-O01 ----- Outerwear: women's, children's, and infants'-wholesale
2211-O04 ----- Outing flannel, cotton-mfg
3644-O01 ----- Outlet boxes (electric wiring devices)-mfg
3643-O01 ----- Outlets, convenience: electric-mfg
8093-O01 ----- Outpatient detoxification centers
8093-O02 ----- Outpatient mental health clinics
8093-O03 ----- Outpatient treatment clinics for alcoholism and drug addiction
8322-O04 ----- Outreach programs
1629-O02 ----- Oven construction, bakers'-general contractors
1629-O03 ----- Oven construction for industrial plants general contractors
3822-O01 ----- Oven temperature controls, nonindustrial-mfg
3556-O02 ----- Ovens, bakery-mfg
3589-O01 ----- Ovens, cafeteria food warming: portable-mfg
3631-O01 ----- Ovens, household: excluding portable appliances other than microwave and convection-mfg
3634-O01 ----- Ovens, household: portable: except microwave and convection ovens-mfg
3567-O01 ----- Ovens, industrial process: except bakery-mfg
3821-O01 ----- Ovens, laboratory-mfg
5046-O01 ----- Ovens, microwave: commercial-wholesale
3589-O02 ----- Ovens, microwave (cooking equipment): commercial-mfg
5064-O01 ----- Ovens, microwave: household-wholesale
3567-O02 ----- Ovens, sherardizing-mfg
3569-O02 ----- Ovens, surveillance: for aging and testing powder-mfg
3229-O06 ----- Ovenware, glass-mfg
3089-O02 ----- Ovenware, plastics-mfg
4213-O01 ----- Over-the-road trucking
2326-O01 ----- Overall jackets: men's and boys'-mfpm-mfg
2326-O02 ----- Overalls, work: men's and boys'-mfpm-mfg
1241-O01 ----- Overburden removal for bituminous coal, anthracite, and lignite on a contract basis
1081-O01 ----- Overburden removal for metal mining: on a contract basis
1481-O01 ----- Overburden removal for nonmetallic minerals, except fuels: on a contract basis
2231-O01 ----- Overcoatings: wool, mohair, and similar animal fibers-mfg
2311-O01 ----- Overcoats: men's and boys'-mfg
5136-O02 ----- Overcoats, men's and boys'-wholesale
3535-O01 ----- Overhead conveyor systems for general industrial use-mfg
1622-O01 ----- Overpass construction-general contractors
2262-O01 ----- Overprinting manmade fiber and silk broadwoven fabric-mfg
3021-O01 ----- Overshoes, plastics-mfg
3021-O02 ----- Overshoes, rubber or rubber soled fabric-mfg
2833-O04 ----- Ox bile salts and derivatives: bulk, uncompounded-mfg
2869-O04 ----- Oxalates-mfg
2869-O05 ----- Oxalic acid and metallic salts-mfg
2211-O05 ----- Oxfords (cotton fabrics)-mfg
2819-O02 ----- Oxidation catalyst made from porcelain-mfg
2899-O08 ----- Oxidizers, inorganic-mfg
2813-O01 ----- Oxygen, compressed and liquefied-mfg
3728-O02 ----- Oxygen systems for aircraft-mfg
8099-O02 ----- Oxygen tent service
3841-O06 ----- Oxygen tents-mfg
5812-O01 ----- Oyster bars
0913-O01 ----- Oyster beds
2048-O02 ----- Oyster shells, ground: used as feed for animals and fowls-mfg
2091-O01 ----- Oysters, canned and cured-mfg
0913-O02 ----- Oysters, dredging or tonging of
2092-O01 ----- Oysters, fresh: shucking and packing in nonsealed containers-mfg
1499-O02 ----- Ozokerite mining
3559-O02 ----- Ozone machines-mfg
