Agriculture-Forestry-Fishing
100 Crop Production
200 Livestock-Animal Specialties
700 Agricultural Services
800 Forestry
900 Fishing-Hunting-Trapping

Mining
1000 Metal Mining
1200 Coal Mining
1300 Oil and Gas Extraction
1400 Nonmetallic Mineral Mining

Construction
1500 Building Contractors
1600 Heavy Construction
1700 Special Trade Contractors

Manufacturing
2000 Food-Related Products
2100 Tobacco Products
2200 Textile Mill Products
2300 Apparel
2400 Lumber-Wood Products
2500 Furniture and Fixtures
2600 Paper-Related Products
2700 Printing-Publishing-Related
2800 Chemicals-Allied Products
2900 Petroleum Refining-Related
3000 Rubber-Plastic Products
3100 Leather-Leather Products
3200 Non-Metal Mineral Products
3300 Primary Metal Industries
3400 Fabricated Metal Products
3500 Industrial Machinery-Computers
3600 Electronic-Electrical Equipment
3700 Transportation Equipment
3800 Instruments
3900 Miscellaneous Manufacturing

Transport-Utilities-Communication
4000 Railroad Transportation
4100 Ground Passenger Transport
4200 Motor Freight Transportation
4400 Water Transportation
4500 Air Transportation
4600 Pipelines, except natural gas
4700 Transportation Services
4800 Communications
4900 Electric-Gas-Sanitary Services