| Machine Assembler | Machine Builder | Machine Cleaner |
| Machine Feeder | Machine Feeder, Raw Stock | Machine Fixer |
| Machine Helper | Machine Molder | Machine Operator I |
| Machine Operator Ii | Machine Operator, Centrifugal-control Switches | Machine Operator, Ceramics |
| Machine Operator, General | Machine Repairer, Maintenance | Machine Set-up Operator |
| Machine Set-up Operator, Paper Goods | Machine Setter | Machine Setter-and-repairer |
| Machine Sneller | Machine Tester | Machine Try-out Setter |
| Machine-adjuster Leader | Machine-assembler Supervisor | Machine-castings Plasterer |
| Machine-clothing Replacer | Machine-made-shoe Unit Worker | Machine-pack Assembler |
| Machine-shop Supervisor, Production | Machine-shop Supervisor, Tool | Machine-stoppage-frequency Checker |
| Machine-tank Operator | Machinery Erector | Machining-and-assembly Supervisor |
| Machinist | Machinist Apprentice | Machinist Apprentice, Automotive |
| Machinist Apprentice, Composing Room | Machinist Apprentice, Linotype | Machinist Apprentice, Marine Engine |
| Machinist Apprentice, Outside | Machinist Apprentice, Wood | Machinist Helper, Outside |
| Machinist Supervisor, Outside | Machinist, Automotive | Machinist, Experimental |
| Machinist, Linotype | Machinist, Marine Engine | Machinist, Motion-picture Equipment |
| Machinist, Outside | Machinist, Wood | Magazine Keeper |
| Magazine Repairer | Magazine Supervisor | Magician |
| Magistrate | Magnesium-mill Operator | Magnetic-tape-composer Operator |
| Magneto Repairer | Mail Carrier | Mail Censor |
| Mail Clerk | Mail Handler | Mail-distribution-scheme Examiner |
| Mail-processing-equipment Mechanic | Mailer | Mailer Apprentice |
| Mailing-machine Operator | Mailroom Supervisor | Mains-and-service Supervisor |
| Mainspring Former, Arbor End | Mainspring Former, Brace End | Mainspring Winder And Oiler |
| Maintainability Engineer | Maintenance Data Analyst | Maintenance Inspector |
| Maintenance Machinist | Maintenance Mechanic | Maintenance Mechanic Helper |
| Maintenance Mechanic, Compressed-gas Plant | Maintenance Mechanic, Engine | Maintenance Mechanic, Telephone |
| Maintenance Repairer, Building | Maintenance Repairer, Industrial | Maintenance Supervisor |
| Maintenance Supervisor, Fire-fighting-equipment | Maintenance Supervisor, Mobile Battery Equipment | Maintenance Worker, Municipal |
| Maintenance-mechanic Helper | Maintenance-mechanic Supervisor | Maintenance-repairer Helper, Industrial |
| Major-assembly Inspector | Make-up Arranger | Make-up Artist |
| Make-up Operator | Make-up Operator Helper | Making-line Worker |
| Malt Roaster | Malt-house Operator | Malt-specifications-control Assistant |
| Management Aide | Management Analyst | Management Trainee |
| Manager, Advertising | Manager, Advertising Agency | Manager, Aerial Planting And Cultivation |
| Manager, Agricultural-labor Camp | Manager, Airport | Manager, Animal Shelter |
| Manager, Apartment House | Manager, Aquatic Facility | Manager, Area Development |
| Manager, Armored Transport Service | Manager, Athlete | Manager, Auto Specialty Services |
| Manager, Automobile Service Station | Manager, Automotive Services | Manager, Bakery |
| Manager, Barber Or Beauty Shop | Manager, Benefits | Manager, Boarding House |
| Manager, Bowling Alley | Manager, Branch | Manager, Branch Operation Evaluation |
| Manager, Branch Store | Manager, Brokerage Office | Manager, Bulk Plant |
| Manager, Bus Transportation | Manager, Camp | Manager, Car Inspection And Repair |
| Manager, Cardroom | Manager, Cargo-and-ramp-services | Manager, Casino |
| Manager, Cemetery | Manager, Christmas-tree Farm | Manager, Circulation |
| Manager, City | Manager, Communications Station | Manager, Compensation |
| Manager, Computer Operations | Manager, Contracts | Manager, Convention |
| Manager, Credit And Collection | Manager, Customer Service | Manager, Customer Services |
| Manager, Customer Technical Services | Manager, Dairy Farm | Manager, Dance Studio |
| Manager, Data Processing | Manager, Dental Laboratory | Manager, Department |
| Manager, Department Store | Manager, Display | Manager, Distribution Warehouse |
| Manager, Dude Ranch | Manager, Education And Training | Manager, Employee Welfare |
| Manager, Employment | Manager, Employment Agency | Manager, Exchange Floor |
| Manager, Export | Manager, Fast Food Services | Manager, Field Party, Geophysical Prospecting |
| Manager, Financial Institution | Manager, Fish Hatchery | Manager, Fish-and-game Club |
| Manager, Flight Control | Manager, Flight Kitchen | Manager, Flight Operations |
| Manager, Flight-reservations | Manager, Food Concession | Manager, Food Processing Plant |
| Manager, Food Service | Manager, Forms Analysis | Manager, Front Office |
| Manager, Game Breeding Farm | Manager, Game Preserve | Manager, Golf Club |
| Manager, Gun Club | Manager, Handicraft-or-hobby Shop | Manager, Harbor Department |
| Manager, Health Club | Manager, Hotel Or Motel | Manager, Hotel Recreational Facilities |
| Manager, Housing Project | Manager, Industrial Cafeteria | Manager, Industrial Organization |
| Manager, Insurance Office | Manager, Internal Security | Manager, Irrigation District |
| Manager, Labor Relations | Manager, Land Development | Manager, Land Leases-and-rentals |
| Manager, Land Surveying | Manager, Laundromat | Manager, Leasing |
| Manager, Liquor Establishment | Manager, Lodging Facilities | Manager, Machinery-or-equipment, Rental And Leasing |
| Manager, Marina Dry Dock | Manager, Marine Service | Manager, Market |
| Manager, Meat Sales And Storage | Manager, Merchandise | Manager, Mutuel Department |
| Manager, Nursery | Manager, Office | Manager, Operations |
| Manager, Orchard | Manager, Parts | Manager, Personnel |
| Manager, Pool | Manager, Poultry Hatchery | Manager, Procurement Services |
| Manager, Production | Manager, Production, Seed Corn | Manager, Professional Equipment Sales-and-service |
| Manager, Promotion | Manager, Property | Manager, Quality Control |
| Manager, Real-estate Firm | Manager, Records Analysis | Manager, Recreation Establishment |
| Manager, Recreation Facility | Manager, Regional | Manager, Regulated Program |
| Manager, Reports Analysis | Manager, Reservations | Manager, Retail Store |
| Manager, Sales | Manager, Schedule Planning | Manager, Service Department |
| Manager, Skating Rink | Manager, Solid-waste-disposal | Manager, Sound Effects |
| Manager, Stage | Manager, Station | Manager, Storage Garage |
| Manager, Telegraph Office | Manager, Textile Conversion | Manager, Theater |
| Manager, Title Search | Manager, Tobacco Warehouse | Manager, Touring Production |
| Manager, Traffic | Manager, Traffic I | Manager, Traffic Ii |
| Manager, Travel Agency | Manager, Truck Terminal | Manager, Utility Sales And Service |
| Manager, Vehicle Leasing And Rental | Manager, Warehouse | Manager, Winter Sports |
| Manager, World Trade And Maritime Division | Mangle Tender | Mangle-press Catcher |
| Mangler | Manicurist | Manipulator |
| Manipulator Operator | Mannequin Mounter | Mannequin Sander And Finisher |
| Mannequin Wig Maker | Mannequin-mold Maker | Manometer Technician |
| Manual Winder | Manual-arts Therapist | Manual-plate Filler |
| Manufacturer's Representative | Manufacturer's Service Representative | Manufacturing Engineer |
| Manugrapher | Map Clerk | Map-and-chart Mounter |
| Maple-syrup Maker | Marble Finisher | Marble Setter |
| Marble-machine Tender | Margin Clerk I | Margin Clerk Ii |
| Marine Engineer | Marine Oiler | Marine Railway Operator |
| Marine Surveyor | Marine-cargo Surveyor | Marine-services Technician |
| Mark-up Designer | Marker | Marker I |
| Marker Ii | Marker Machine Attendant | Marker, Company |
| Marker, Hand | Marker, Machine | Marker, Semiconductor Wafers |
| Market-research Analyst I | Marking Stitcher | Marking-machine Operator |
| Marking-machine Tender | Marksmanship Instructor | Marquetry Worker |
| Marshal | Mash Grinder | Mash-filter Operator |
| Mash-filter-cloth Changer | Mash-tub-cooker Operator | Masher |
| Masker | Masking-machine Feeder | Masking-machine Operator |
| Masseur/masseuse | Master Control Operator | Master, Passenger Barge |
| Master, Riverboat | Master, Ship | Master, Yacht |
| Mat Cutter | Mat Inspector | Mat Packer |
| Mat Puncher | Mat Repairer | Mat Sewer |
| Mat Tester | Mat-machine Operator | Mat-making Machine Tender |
| Match-up Worker | Matchbook Assembler | Matcher, Leather Parts |
| Mate, Fishing Vessel | Mate, Ship | Material Assembler |
| Material Clerk | Material Coordinator | Material Expediter |
| Material Handler | Material Inspector | Material Lister |
| Material Mixer | Material Preparation Worker | Material Scheduler |
| Material-crew Supervisor | Material-handling Supervisor | Materials Engineer |
| Materials Scientist | Mathematical Technician | Mathematician |
| Matrix Inspector | Matrix Plater | Matrix Worker |
| Matrix-bath Attendant | Matrix-drier Tender | Matting-press Tender |
| Mattress Finisher | Mattress Maker | Mattress Stripper |
| Mattress-filling-machine Tender | Mattress-spring Encaser | Maturity Checker |
| Meal-grinder Tender | Measurer | Measuring-machine Operator |
| Meat Blender | Meat Clerk | Meat Cutter |
| Meat Dresser | Meat Grinder | Meat-cutter Apprentice |
| Meat-grading-machine Operator | Mechanic, Endless Track Vehicle | Mechanic, Industrial Truck |
| Mechanical Engineer | Mechanical Inspector | Mechanical Oxidizer |
| Mechanical Research Engineer | Mechanical Technician, Laboratory | Mechanical-design Engineer, Facilities |
| Mechanical-design Engineer, Products | Mechanical-engineering Technician | Mechanical-maintenance Supervisor |
| Mechanical-shovel Operator | Mechanical-test Technician | Mechanical-unit Repairer |
| Mechanism Assembler | Media Clerk | Media Director |
| Media Specialist, School Library | Medical Assistant | Medical Coordinator, Pesticide Use |
| Medical Physicist | Medical Radiation Dosimetrist | Medical Record Technician |
| Medical Secretary | Medical Technologist | Medical Technologist, Chief |
| Medical Technologist, Teaching Supervisor | Medical-equipment Repairer | Medical-laboratory Technician |
| Medical-record Administrator | Medical-record Clerk | Medical-service Technician |
| Medical-voucher Clerk | Mellowing-machine Operator | Melt-house Drag Operator |
| Melter | Melter Clerk | Melter Operator |
| Melter Supervisor | Membership Director | Membership Secretary |
| Membership Solicitor | Memorial Designer | Mender |
| Mender, Knit Goods | Mental-retardation Aide | Merchandise Distributor |
| Merchant Patroller | Mercury Purifier | Mercury Washer |
| Mercury-cracking Tester | Mesh Cutter | Mess Attendant |
| Messenger, Copy | Metal Control Worker | Metal Fabricator |
| Metal Fabricator Helper | Metal Finisher | Metal Hanger |
| Metal Sander And Finisher | Metal Sprayer, Corrosion Prevention | Metal Sprayer, Machined Parts |
| Metal Sprayer, Production | Metal-bed Assembler | Metal-bonding Crib Attendant |
| Metal-bonding Press Operator | Metal-cleaner, Immersion | Metal-control Coordinator |
| Metal-fabricating-shop Helper | Metal-fabricator Apprentice | Metal-finish Inspector |
| Metal-reed Tuner | Metal-sponge-making-machine Operator | Metal-spraying-machine Operator, Automatic I |
| Metal-spraying-machine Operator, Automatic Ii | Metal-washing-machine Operator | Metallic-yarn-slitting-machine Operator |
| Metallization Equipment Tender, Semiconductors | Metallographer | Metallurgical Technician |
| Metallurgist, Extractive | Metallurgist, Physical | Meteorological-equipment Repairer |
| Meteorologist | Meter Inspector | Meter Reader |
| Meter Reader, Chief | Meter Repairer | Meter-repairer Helper |
| Metrologist | Mexican Food Maker, Hand | Mexican-food-machine Tender |
| Mica Inspector | Mica Patcher | Mica Sizer |
| Mica Splitter | Mica-laminating-machine Feeder | Mica-plate Layer |
| Mica-plate Layer, Hand | Microbiologist | Microbiology Technologist |
| Microcomputer Support Specialist | Microelectronics Technician | Microfiche Duplicator |
| Microfilm Mounter | Microfilm Processor | Microfilm-camera Operator |
| Microphone-boom Operator | Middle-card Tender | Migrant Leader |
| Milk Driver | Milk Receiver | Milk Sampler |
| Milk-powder Grinder | Milk-receiver, Tank Truck | Milker, Machine |
| Milking-system Installer | Mill Attendant I | Mill Attendant Ii |
| Mill Feeder | Mill Hand, Plate Mill | Mill Helper |
| Mill Operator | Mill Operator, Rolls | Mill Platform Supervisor |
| Mill Recorder, Computerized Mill | Mill Stenciler | Mill Supervisor |
| Mill-and-coal-transport Operator | Mill-labor Supervisor | Mill-operator Helper |
| Mill-roll Rewinder | Milled-rubber Tender | Miller |
| Miller Helper, Distillery | Miller I | Miller Ii |
| Miller Supervisor | Miller, Distillery | Miller, Head, Assistant, Wet Process |
| Miller, Head, Wet Process | Miller, Wet Process | Miller, Wood Flour |
| Milliner | Milling Supervisor | Milling-machine Set-up Operator I |
| Milling-machine Set-up Operator Ii | Milling-machine Set-up Operator, Numerical Control | Milling-machine Tender |
| Millwright | Millwright Apprentice | Millwright Helper |
| Millwright Supervisor | Mime | Mincemeat Maker |
| Mine Inspector | Mine Superintendent | Mine-car Repairer |
| Miner | Miner I | Miner, Placer |
| Mineralogist | Mingler Operator | Miniature-set Constructor |
| Mining Engineer | Mirror Installer | Mirror Specialist |
| Mirror-finishing-machine Operator | Mirror-machine Feeder | Missile Facilities Repairer |
| Miter Grinder Operator | Mix-crusher Operator | Mix-house Tender |
| Mixer | Mixer Helper | Mixer I |
| Mixer Ii | Mixer Operator | Mixer Operator Helper, Hot Metal |
| Mixer Operator I | Mixer Operator Ii | Mixer Operator, Carbon Paste |
| Mixer Operator, Hot Metal | Mixer Operator, Snack Foods | Mixer Tender, Board |
| Mixer, Chili Powder | Mixer, Diamond Powder | Mixer, Dry-food Products |
| Mixer, Foam Rubber | Mixer, Wet Pour | Mixer, Whipped Topping |
| Mixer-and-blender | Mixing Supervisor | Mixing-machine Feeder |
| Mixing-machine Operator | Mixing-machine Tender | Mixing-roll Operator |
| Mixing-tank Operator | Mobile-home-lot Utility Worker | Mobile-lounge Driver |
| Mock-up Builder | Model | Model Builder |
| Model Maker | Model Maker I | Model Maker Ii |
| Model Maker, Fiberglass | Model Maker, Firearms | Model Maker, Scale |
| Model Maker, Wood | Model, Artists' | Model, Photographers' |
| Model-and-mold Maker | Model-and-mold Maker, Plaster | Model-maker Apprentice |
| Modeler | Mohel | Moisture Tester |
| Moisture-conditioner Operator | Moisture-machine Tender | Moisture-meter Operator |
| Molasses And Caramel Operator | Molasses Preparer | Mold Cleaner |
| Mold Closer | Mold Dresser | Mold Filler |
| Mold Filler And Drainer | Mold Filler, Plastic Dolls | Mold Finisher |
| Mold Laminator | Mold Maker | Mold Maker I |
| Mold Maker Ii | Mold Maker, Die-casting And Plastic Molding | Mold Maker, Terra Cotta |
| Mold Parter | Mold Polisher | Mold Preparer |
| Mold Presser | Mold Setter | Mold Sheet Cleaner |
| Mold Stamper | Mold Stamper And Repairer | Mold Stripper |
| Mold Worker | Mold-filling Operator | Mold-insert Changer |
| Mold-maker Apprentice | Mold-maker Helper | Molded-rubber-goods Cutter |
| Molder | Molder Apprentice | Molder Helper |
| Molder Operator | Molder, Automobile Carpets | Molder, Bench |
| Molder, Fiberglass Luggage | Molder, Foam Rubber | Molder, Hand |
| Molder, Inflated Ball | Molder, Labels | Molder, Lead Ingot |
| Molder, Machine | Molder, Meat | Molder, Pattern |
| Molder, Pipe Covering | Molder, Punch | Molder, Shoe Parts |
| Molder, Shoulder Pad | Molder, Sweep | Molder, Toilet Products |
| Molder, Wax | Molder, Wax Ball | Molder-machine Tender |
| Molding Cutter | Molding Sander | Molding Supervisor |
| Molding-machine Operator | Molding-machine Tender | Molding-machine-operator Helper |
| Molybdenum-steamer Operator | Money Counter | Monitor Car Operator |
| Monitor-and-storage-bin Tender | Monogram-and-letter Paster | Monomer-purification Operator |
| Monorail Crane Operator | Monotype-keyboard Operator | Monument Setter |
| Mop Maker | Mop-handle Assembler | Mophead Trimmer-and-wrapper |
| Morgue Attendant | Mortgage Clerk | Mortgage Loan Closer |
| Mortgage Loan Processor | Mortgage-accounting Clerk | Mortgage-closing Clerk |
| Mortgage-loan-computation Clerk | Mortician Investigator | Mortising-machine Operator |
| Mortuary Beautician | Mosaic Worker | Mosaicist |
| Mosquito Sprayer | Mother Repairer | Motion-picture Projectionist |
| Motor Operator | Motor Polarizer | Motor-grader Operator |
| Motor-power Connector | Motor-room Controller | Motorboat Mechanic |
| Motorboat Operator | Motorboat-mechanic Helper | Motorcycle Assembler |
| Motorcycle Racer | Motorcycle Repairer | Motorcycle Subassembler |
| Motorcycle Subassembly Repairer | Motorcycle Tester | Mottle-lay-up Operator |
| Mottler Operator | Mottler-machine Feeder | Mounter I |
| Mounter Ii | Mounter, Automatic | Mounter, Clock And Watch Hands |
| Mounter, Hand | Mounter, Smoking Pipe | Mouthpiece Maker |
| Mucking-machine Operator | Mud Boss | Mud-mill Tender |
| Mud-mixer Helper | Mud-mixer Operator | Mud-plant Operator |
| Muffler Installer | Multi-operation-forming-machine Operator I | Multi-operation-forming-machine Operator Ii |
| Multi-operation-forming-machine Setter | Multi-operation-machine Operator | Multi-purpose Machine Operator |
| Multifocal-lens Assembler | Multineedle-chainstitch-machine Operator | Multiple-drum Sander |
| Multiple-drum-sander Helper | Munitions Handler | Museum Attendant |
| Museum Technician | Music Copyist | Music Engraver |
| Music Grapher | Music Librarian | Music Librarian, International Broadcast |
| Music Supervisor | Music Therapist | Musical-string Maker |
| Musician, Instrumental | Mva-reactor Operator | Mva-reactor Operator, Head |
| Mycologist |
