| NAICS code | NAICS Text
| SIC code | SIC Text
|
| 111940 | Hay Farming | 0139 | Field Crops, Except Cash Grains, NEC (hay farms) |
| 1122 | Hog and Pig Farming | | |
| 112210 | Hog and Pig Farming | 0213 | Hogs |
| 112920 | Horse and Other Equine Production | 0272 | Horses and Other Equines |
| 1142 | Hunting and Trapping | | |
| 114210 | Hunting and Trapping | 0971 | Hunting and Trapping, and Game Propagation |
| 221111 | Hydroelectric Power Generation | 4911 | Electric Services (hydroelectric power generation) |
| 221111 | Hydroelectric Power Generation | 4931 | Electric and Other Services Combined (hydroelectric power generation) |
| 221111 | Hydroelectric Power Generation | 4939 | Combination Utilities, NEC (hydroelectric power generation) |
| 234 | Heavy Construction | | |
| 2341 | Highway, Street, Bridge, and Tunnel Construction | | |
| 234110 | Highway and Street Construction | 1611 | Highway and Street Construction, Except Elevated Highways |
| 234110 | Highway and Street Construction | 8741 | Management Services (highway and street construction management) |
| 315110 | Hosiery and Sock Mills | | |
| 315991 | Hat, Cap, and Millinery Manufacturing | 2353 | Hats, Caps, and Millinery (except contractors) |
| 316212 | House Slipper Manufacturing | 3142 | House Slippers |
| 321211 | Hardwood Veneer and Plywood Manufacturing | 2435 | Hardwood Veneer and Plywood |
| 332212 | Hand and Edge Tool Manufacturing | 3421 | Cutlery (tool-type shears) |
| 332212 | Hand and Edge Tool Manufacturing | 3423 | Hand and Edge Tools, Except Machine Tools and Handsaws |
| 332212 | Hand and Edge Tool Manufacturing | 3523 | Farm Machinery and Equipment (hand hair clippers for animals) |
| 332212 | Hand and Edge Tool Manufacturing | 3524 | Lawn and Garden Tractors and Home Lawn and Garden Equipment (nonpowered lawnmowers) |
| 332212 | Hand and Edge Tool Manufacturing | 3545 | Cutting Tools, Machine Tools Accessories, and Machinist Precision Measuring Devices (precision measuring |
| 332212 | Hand and Edge Tool Manufacturing | 3644 | Noncurrent-Carrying Wiring Devices (fish wire, electrical wiring tool) |
| 332212 | Hand and Edge Tool Manufacturing | 3999 | Manufacturing Industries, NEC (tape measures) |
| 3325 | Hardware Manufacturing | | |
| 332510 | Hardware Manufacturing | 3429 | Hardware, NEC (other hardware) |
| 332510 | Hardware Manufacturing | 3499 | Fabricated Metal Products, NEC (safe and vault locks) |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 3433 | Heating Equipment, Except Electric and Warm Air Furnaces |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 3569 | General Industrial Machinery and Equipment, NEC (electric swimming pool heaters) |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 3634 | Electric Housewares and Fans (wall and baseboard heating units for permanent installation) |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 2499 | Wood Products, NEC (wood cooling towers) |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 3443 | Fabricated Plate Work (Boiler Shops) (metal cooling towers) |
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | 3444 | Sheet Metal Work (sheet metal cooling towers) |
| 3352 | Household Appliance Manufacturing | | |
| 335212 | Household Vacuum Cleaner Manufacturing | 3635 | Household Vacuum Cleaners |
| 335212 | Household Vacuum Cleaner Manufacturing | 3639 | Household Appliances, NEC (floor waxing and floor polishing machines) |
| 335221 | Household Cooking Appliance Manufacturing | 3631 | Household Cooking Equipment |
| 335222 | Household Refrigerator and Home Freezer Manufacturing | 3632 | Household Refrigerators and Home and Farm Freezers |
| 335224 | Household Laundry Equipment Manufacturing | 3633 | Household Laundry Equipment |
| 336120 | Heavy Duty Truck Manufacturing | 3711 | Motor Vehicles and Passenger Car Bodies (heavy duty trucks) |
| 3371 | Household and Institutional Furniture and Kitchen Cabinet Manufacturing | | |
| 337120 | Household and Institutional Furniture Manufacturing | | |
| 337125 | Household Furniture (except Wood and Metal) Manufacturing | 2519 | Household Furniture, NEC |
| 421220 | Home Furnishing Wholesalers | 5023 | Homefurnishings (except homefurnishings sold via retail method) |
| 4217 | Hardware, and Plumbing and Heating Equipment and Supplies Wholesalers | | |
| 421710 | Hardware Wholesalers | 5072 | Hardware (except sold via retail method) |
| 4422 | Home Furnishings Stores | | |
| 443111 | Household Appliance Stores | 5722 | Household Appliance Stores |
| 443111 | Household Appliance Stores | 7623 | Refrigeration and Air-Conditioning Service and Repair Shops (retailing new refrigerators from a storefron |
| 443111 | Household Appliance Stores | 7629 | Electrical and Electronic Repair Shops, NEC (retailing new electrical and electronic appliances from a st |
| 444110 | Home Centers | 5211 | Lumber and Other Building Materials Dealers (home center stores) |
| 444130 | Hardware Stores | 5072 | Hardware (sold via retail method) |
| 444130 | Hardware Stores | 5251 | Hardware Stores |
| 446 | Health and Personal Care Stores | | |
| 4461 | Health and Personal Care Stores | | |
| 451120 | Hobby, Toy, and Game Stores | 5945 | Hobby, Toy, and Game Stores |
| 454311 | Heating Oil Dealers | 5171 | Petroleum Bulk Stations and Terminals (heating oil sold to final consumer) |
| 454311 | Heating Oil Dealers | 5983 | Fuel Oil Dealers |
| 525120 | Health and Welfare Funds | 6371 | Pension, Health, and Welfare Funds (health and welfare funds) |
| 532291 | Home Health Equipment Rental | 7352 | Medical Equipment Rental and Leasing (home health furniture and equipment rental and leasing) |
| 541612 | Human Resources and Executive Search Consulting Services | 8742 | Management Consulting Services (human resources and personnel management consulting) |
| 541612 | Human Resources and Executive Search Consulting Services | 7361 | Employment Agencies (executive placement services) |
| 541612 | Human Resources and Executive Search Consulting Services | 8999 | Services, NEC (actuarial consulting) |
| 562112 | Hazardous Waste Collection | 4212 | Local Trucking Without Storage (hazardous waste collection without disposal) |
| 562211 | Hazardous Waste Treatment and Disposal | 4953 | Refuse Systems (hazardous waste treatment and disposal) |
| 62 | Health Care and Social Assistance | | |
| 621491 | HMO Medical Centers | 8011 | Offices and Clinics of Doctors of Medicine (HMO Medical Centers) |
| 6216 | Home Health Care Services | | |
| 621610 | Home Health Care Services | 8082 | Home Health Care Services |
| 622 | Hospitals | | |
| 623312 | Homes for the Elderly | 8361 | Residential Care (homes for the elderly) |
| 712120 | Historical Sites | 8412 | Museums and Art Galleries (historic and heritage sites) |
| 721110 | Hotels (except Casino Hotels) and Motels | 7011 | Hotels and Motels (hotels and motels, except casino hotels) |
| 721110 | Hotels (except Casino Hotels) and Motels | 7041 | Organization Hotels and Lodging Houses, on Membership Basis (hotels) |
| 811410 | Home and Garden Equipment and Appliance Repair and Maintenance | | |
| 811411 | Home and Garden Equipment Repair and Maintenance | 7699 | Repair Shops and Related Services, NEC (lawnmower repair shops, sharpening and repairing knives, saws and |
| 812110 | Hair, Nail, and Skin Care Services | | |
| 813311 | Human Rights Organizations | 8399 | Social Services, NEC (human rights organizations) |