213112 – SUPPORT ACTIVITIES FOR OIL AND GAS OPERATIONS
236115 – NEW SINGLE-FAMILY HOUSING CONSTRUCTION (EXCEPT FOR-SALE BUILDERS)
236116 – NEW MULTIFAMILY HOUSING CONSTRUCTION (EXCEPT FOR-SALE BUILDERS)
236117 – NEW HOUSING FOR-SALE BUILDERS
236118 – RESIDENTIAL REMODELERS
236210 – INDUSTRIAL BUILDING CONSTRUCTION
236220 – COMMERCIAL AND INSTITUTIONAL BUILDING CONSTRUCTION
237110 – WATER AND SEWER LINE AND RELATED STRUCTURES CONSTRUCTION
237120 – OIL AND GAS PIPELINE AND RELATED STRUCTURES CONSTRUCTION
237130 – POWER AND COMMUNICATION LINE AND RELATED STRUCTURES CONSTRUCTION
237310 – HIGHWAY, STREET, AND BRIDGE CONSTRUCTION
237990 – OTHER HEAVY AND CIVIL ENGINEERING CONSTRUCTION
238110 – POURED CONCRETE FOUNDATION AND STRUCTURE CONTRACTORS
238120 – STRUCTURAL STEEL AND PRECAST CONCRETE CONTRACTORS
238140 – MASONRY CONTRACTORS
238190 – OTHER FOUNDATION, STRUCTURE, AND BUILDING EXTERIOR CONTRACTORS
238350 – FINISH CARPENTRY CONTRACTORS
238910 – SITE PREPARATION CONTRACTORS
238990 – ALL OTHER SPECIALTY TRADE CONTRACTORS
321114 – WOOD PRESERVATION
541330 – ENGINEERING SERVICES
541370 – SURVEYING AND MAPPING (EXCEPT GEOPHYSICAL) SERVICES
561730 – LANDSCAPING SERVICES
813910 – BUSINESS ASSOCIATIONS