| Label Coder | Label Drier | Label Pinker |
| Label Remover | Label-cutting-and-folding-machine Operator, Automatic | Labeling-machine Operator |
| Labor Expediter | Labor-crew Supervisor | Laboratory Assistant |
| Laboratory Assistant, Blood And Plasma | Laboratory Assistant, Culture Media | Laboratory Assistant, Liaison Inspection |
| Laboratory Assistant, Metallurgical | Laboratory Chief | Laboratory Clerk |
| Laboratory Helper | Laboratory Manager | Laboratory Miller |
| Laboratory Supervisor | Laboratory Technician | Laboratory Technician, Artificial Breeding |
| Laboratory Technician, Pharmaceutical | Laboratory Tester | Laboratory-equipment Installer |
| Laboratory-sample Carrier | Laborer | Laborer, Airport Maintenance |
| Laborer, Ammunition Assembly I | Laborer, Ammunition Assembly Ii | Laborer, Aquatic Life |
| Laborer, Boot And Shoe | Laborer, Brush Clearing | Laborer, Canvas Shop |
| Laborer, Car Barn | Laborer, Cheesemaking | Laborer, Chemical Processing |
| Laborer, Concrete Plant | Laborer, Concrete-mixing Plant | Laborer, Construction Or Leak Gang |
| Laborer, Cook House | Laborer, Electroplating | Laborer, General |
| Laborer, Gold Leaf | Laborer, Grinding And Polishing | Laborer, High-density Press |
| Laborer, Hoisting | Laborer, Hot-plate Plywood Press | Laborer, Landscape |
| Laborer, Petroleum Refinery | Laborer, Pie Bakery | Laborer, Pipelines |
| Laborer, Poultry Farm | Laborer, Poultry Hatchery | Laborer, Powerhouse |
| Laborer, Prestressed Concrete | Laborer, Rags | Laborer, Salvage |
| Laborer, Shellfish Processing | Laborer, Shipyard | Laborer, Solder Making |
| Laborer, Starch Factory | Laborer, Stores | Laborer, Syrup Machine |
| Laborer, Tanbark | Laborer, Tin Can | Laborer, Tree Tapping |
| Laborer, Vat House | Laborer, Wharf | Laborer, Wood-preserving Plant |
| Lace Winder | Lace-paper-machine Operator | Lace-roller Operator |
| Lacer | Lacer I | Lacer Ii |
| Lacing-string Cutter | Lacquer Maker | Lacquer-dipping-machine Operator |
| Lacquer-pin-press Operator | Lacquerer | Ladle Liner |
| Ladle Pourer | Lag Screwer | Lagging-machine Operator |
| Lamber | Laminated-plastic-tabletop-molding Wrapper | Laminating-machine Feeder |
| Laminating-machine Offbearer | Laminating-machine Operator | Laminating-machine Tender |
| Laminator | Laminator I | Laminator Ii |
| Laminator, Hand | Laminator, Preforms | Laminator, Printed Circuit Boards |
| Lamp-shade Assembler | Lamp-shade Joiner | Lamp-shade Sewer |
| Land Surveyor | Land-leasing Examiner | Landscape Architect |
| Landscape Contractor | Landscape Gardener | Landscape Specialist |
| Lane-marker Installer | Lap Cutter-truer Operator | Lapel Padder, Blindstitch |
| Lapper | Lapper, Hand, Tool | Lapping-machine Operator, Production |
| Lapping-machine Set-up Operator | Lard Refiner | Larry Operator |
| Laser Technician | Laser-beam-machine Operator | Laserist |
| Last Chalker | Last Cleaner | Last Ironer |
| Last Marker | Last Puller | Last Putter-away |
| Last Remodeler-repairer | Last Repairer | Last Sawyer |
| Last Scourer | Last Trimmer | Last-model Maker |
| Last-pattern Grader | Last-repairer Helper | Laster |
| Laster, Hand | Lasting-machine Operator, Hand Method | Latex Spooler |
| Latex-ribbon-machine Operator | Latexer | Latexer I |
| Lathe Hand | Lathe Operator | Lathe Operator, Contact Lens |
| Lathe Operator, Numerical Control | Lathe Sander | Lathe Spotter |
| Lathe Tender | Lathe Winder | Lather |
| Lather Apprentice | Latrine Cleaner | Launch Commander, Harbor Police |
| Launderer, Hand | Laundry Clerk | Laundry Laborer |
| Laundry Operator | Laundry Pricing Clerk | Laundry Worker I |
| Laundry Worker Ii | Laundry Worker Iii | Laundry Worker, Domestic |
| Laundry-bag-punch Operator | Laundry-machine Mechanic | Laundry-machine Tender |
| Laundry-tub Maker | Lawn-service Worker | Lawn-sprinkler Installer |
| Lawyer | Lawyer, Admiralty | Lawyer, Corporation |
| Lawyer, Criminal | Lawyer, Patent | Lawyer, Probate |
| Lawyer, Real Estate | Lay-out Former | Lay-out Inspector |
| Lay-out Technician | Lay-out Worker | Lay-out Worker I |
| Lay-out Worker Ii | Lay-out-machine Operator | Layaway Clerk |
| Layboy Tender | Layer | Leacher |
| Lead Burner | Lead Caster | Lead Former |
| Lead Handler | Lead Operator | Lead Operator, Automatic Vulcanizing |
| Lead Pony Rider | Lead Recoverer, Continuous-naphtha-treating Plant | Lead Worker, Wafer Polishing |
| Lead Worker, Wafer Production | Lead-burner Apprentice | Lead-burner Supervisor |
| Lead-caster Helper | Lead-nitrate Processor | Lead-oxide-mill Tender |
| Lead-press Operator | Lead-section Supervisor | Leader Tier |
| Leaf Conditioner | Leaf Coverer | Leaf Sorter |
| Leaf Tier | Leaf-conditioner Helper | Leaf-size Picker |
| Leak Hunter | Lease Buyer | Lease Picker |
| Lease-out Worker | Leasing Agent, Outdoor Advertising | Leasing Agent, Residence |
| Leasing-machine Tender | Leather Cleaner | Leather Coater |
| Leather Cutter | Leather Etcher | Leather Finisher |
| Leather Grader | Leather Softener | Leather Stamper |
| Leather Tooler | Leather Worker | Leather-belt Maker |
| Legal Investigator | Legal Secretary | Legend Maker |
| Legislative Assistant | Lehr Tender | Lei Seller |
| Lens Examiner | Lens Hardener | Lens Inserter |
| Lens Matcher | Lens Mounter Ii | Lens Polisher, Hand |
| Lens-blank Gauger | Lens-block Gauger | Lens-fabricating-machine Tender |
| Lens-mold Setter | Lens-molding-equipment Operator | Letter-of-credit Clerk |
| Letter-of-credit Document Examiner | Letterer | Level-glass-forming-machine Operator |
| Level-glass-vial Filler | Level-vial Curvature Gauger | Level-vial Inside Grinder |
| Level-vial Inspector-and-tester | Level-vial Marker | Level-vial Sealer |
| Level-vial Setter | Leveler I | Lever Miller |
| Lever Tender | Levers-lace Machine Operator | Liaison Engineer |
| Librarian | Librarian, Special Collections | Librarian, Special Library |
| Library Assistant | Library Clerk, Talking Books | Library Consultant |
| Library Director | Library Technical Assistant | Librettist |
| License Clerk | License Inspector | Lifeguard |
| Lift-slab Operator | Light Air Defense Artillery Crewmember | Light Technician |
| Light-bulb Assembler | Light-fixture Servicer | Lighting-equipment Operator |
| Lightout Examiner | Lime Mixer Tender | Lime Slaker |
| Lime-kiln Operator | Lime-sludge Kiln Operator | Lime-sludge Mixer |
| Line Erector | Line Inspector | Line Installer, Street Railway |
| Line Installer-repairer | Line Maintainer | Line Mover |
| Line Repairer | Line Supervisor | Line Tender, Flakeboard |
| Line Walker | Line-erector Apprentice | Line-out Worker I |
| Line-out Worker Ii | Line-service Attendant | Line-up Examiner |
| Line-up Worker | Linen Controller | Linen Grader |
| Linen-room Attendant | Linen-room Supervisor | Linen-supply Load-builder |
| Liner | Liner Assembler | Liner Inserter |
| Liner Replacer | Liner Reroll Tender | Liner-machine Operator |
| Liner-machine-operator Helper | Lines Tender | Lingo Cleaner |
| Lining Baster, Jumpbasting | Lining Cementer | Lining Feller, Blindstitch |
| Lining Inserter | Lining Maker, Lockstitch | Lining Scrubber |
| Lining Setter, Lockstitch | Lining-machine Operator | Link-and-link-knitting-machine Operator |
| Linker | Linking-machine Operator | Linotype Operator |
| Linseed-oil Refiner | Linseed-oil-press Tender | Linter Tender |
| Linter-saw Sharpener | Lip Cutter And Scorer | Lip-of-shank Cutter |
| Liquefaction-and-regasification-plant Operator | Liquefaction-plant Operator | Liquid-fertilizer Servicer |
| Liquid-sugar Fortifier | Liquid-sugar Melter | Liquor Blender |
| Liquor Inspector | Liquor-bridge Operator | Liquor-bridge-operator Helper |
| Liquor-grinding-mill Operator | Literary Agent | Lithograph-press Operator, Tinware |
| Lithographed-plate Inspector | Lithographic Platemaker | Lithographic-plate-maker Apprentice |
| Lithographic-proofer Apprentice | Livestock Rancher | Livestock-yard Attendant |
| Load Checker | Load Dispatcher | Load Tester |
| Load-out Supervisor | Load-test Mechanic | Loader |
| Loader Helper | Loader I | Loader, Magazine Grinder |
| Loader, Malt House | Loader-demolder | Loader-unloader, Screen-printing Machine |
| Loading Inspector | Loading-machine Adjuster | Loading-machine Operator |
| Loading-machine Tool-setter | Loading-machine-operator Helper | Loading-rack Supervisor |
| Loading-shovel Oiler | Loading-unit Operator | Loading-unit Tool-setter |
| Loan Interviewer, Mortgage | Loan Officer | Loan Review Analyst |
| Lobbyist | Location Manager | Location-and-measurement Technician |
| Lock Assembler | Lock Installer | Lock Maintenance Supervisor |
| Lock Operator | Lock Tender Ii | Lock Tender, Chief Operator |
| Lock-corner-machine Operator | Locker-plant Attendant | Locker-room Attendant |
| Locket Maker | Locksmith | Locksmith Apprentice |
| Lockstitch-machine Operator | Lockstitch-sewing-machine Operator, Complete Garment | Locomotive Engineer |
| Locomotive Inspector | Locomotive Lubricating-systems Clerk | Locomotive Operator Helper |
| Locomotive-crane Operator | Loft Worker | Loft Worker Apprentice |
| Loft Worker, Head | Log Cooker | Log Grader |
| Log Inspector | Log Loader | Log Loader Helper |
| Log Marker | Log Peeler | Log Roller |
| Log Scaler | Log Sorter | Log Washer |
| Log-chipper Operator | Log-cut-off Sawyer, Automatic | Log-haul Chain Feeder |
| Log-truck Driver | Logger, All-round | Logging-equipment Mechanic |
| Logging-operations Inspector | Logging-tractor Operator | Logistics Engineer |
| Long-chain Beamer | Long-goods Helper, Machine | Long-wall Shear Operator |
| Long-wall-mining-machine Tender | Loom Changeover Operator | Loom Changer |
| Loom Fixer | Loom Setter, Wire Weaving | Loom Starter |
| Loom-fixer Supervisor | Loom-winder Tender | Looper |
| Loose-end Finder, Bobbin | Lost-and-found Clerk | Lost-charge-card Clerk |
| Lot Attendant | Lounge-car Attendant | Lowerator Operator |
| Lozenge Maker | Lozenge-dough Mixer | Lubricating-machine Tender |
| Lubrication Servicer | Lubrication-equipment Servicer | Lubricator-granulator |
| Luggage Maker | Luggage Repairer | Lumber Estimator |
| Lumber Handler | Lumber Scaler | Lumber Sorter |
| Lumber Straightener | Lumite Injector | Lump Inspector |
| Lumpia Wrapper Maker | Lunch-truck Driver | Luster Applicator |
| Lye Treater | Lye-peel Operator | Lyricist |
