Sector 23: Construction NAICS 236100 - Residential Building Construction NAICS 236200 - Nonresidential Building Construction NAICS 237100 - Utility System Construction NAICS 237200 - Land Subdivision NAICS 237300 - Highway, Street, and Bridge Construction NAICS 237900 - Other Heavy and Civil Engineering Construction NAICS 238100 - Foundation, Structure, and Building Exterior Contractors NAICS 238200 - Building Equipment Contractors NAICS 238300 - Building Finishing Contractors NAICS 238900 - Other Specialty Trade Contractors