General and special trade contractors primarily engaged in the construction of heavy projects, not elsewhere classified.
| Athletic field construction—general contractors | Lock and waterway construction—general contractors |
| Blasting, except building demolition—contractors | Marine construction—general contractors |
| Breakwater construction—general contractors | Mine loading and discharging station construction—general contractors |
| Bridle path construction—general contractors | Mining appurtenance construction—general contractors |
| Brush clearing or cutting—contractors | Missile facilities construction—general contractors |
| Caisson drilling—contractors | Nuclear reactor containment structure construction—general contractors |
| Canal construction—general contractors | Oil refinery construction—general contractors |
| Central station construction—general contractors | Oven construction for industrial plants—general contractors |
| Channel construction—general contractors | Oven construction, bakers'—general contractors |
| Channel cutoff construction—general contractors | Petrochemical plant construction—general contractors |
| Chemical complex or facilities construction—general contractors | Petroleum refinery construction—general contractors |
| Clearing of land—general contractors | Pier construction—general contractors |
| Cofferdam construction—general contractors | Pile driving—contractors |
| Coke oven construction—general contractors | Pond construction—general contractors |
| Cutting right-of-way—general contractors | Power plant construction—general contractors |
| Dam construction—general contractors | Railroad construction—general contractors |
| Dike construction—general contractors | Railway roadbed construction—general contractors |
| Discharging station construction, mine—general contractors | Reclamation projects construction—general contractors |
| Dock construction—general contractors | Reservoir construction—general contractors |
| Drainage project construction—general contractors | Revetment construction—general contractors |
| Dredging—general contractors | Rock removal, underwater—contractors |
| Earth moving, not connected with building construction—general | Sewage treatment plant construction—general contractors |
| Flood control project construction—general contractors | Ski tow erection—general contractors |
| Furnace construction for industrial plants—general contractors | Soil compacting service—contractors |
| Golf course construction—general contractors | Submarine rock removal—general contractors |
| Harbor construction—general contractors | Subway construction—general contractors |
| Hydroelectric plant construction—general contractors | Tennis court construction, outdoor—general contractors |
| Industrial incinerator construction—general contractors | Timber removal, underwater—contractors |
| Industrial plant appurtenance construction—general contractors | Tipple construction—general contractors |
| Irrigation projects construction—general contractors | Trail building—general contractors |
| Jetty construction—general contractors | Trailer camp construction—general contractors |
| Kiln construction—general contractors | Trenching—contractors |
| Land clearing—contractors | Washeries construction, mining—general contractors |
| Land drainage—contractors | Waste disposal plant construction—general contractors |
| Land leveling (irrigation)—contractors | Water power project construction—general contractors |
| Land reclamation—contractors | Water treatment plant construction—general contractors |
| Levee construction—general contractors | Waterway construction—general contractors |
| Light and power plant construction—general contractors | Wharf construction—general contractors |
| Loading station construction, mine—general contractors | |
| Codes |
Titles | Total Marketable US Businesses |
| 16290000 | Heavy construction, nec | 2,071 |
| 16290100 | Dams, waterways, docks, and other marine construction | 477 |
| 16290101 | Caisson drilling | 63 |
| 16290102 | Canal construction | 27 |
| 16290103 | Dam construction | 78 |
| 16290104 | Dock construction | 257 |
| 16290105 | Drainage system construction | 463 |
| 16290106 | Dredging contractor | 159 |
| 16290107 | Harbor construction | 57 |
| 16290108 | Irrigation system construction | 340 |
| 16290109 | Levee construction | 50 |
| 16290110 | Marine construction | 1,653 |
| 16290111 | Pier construction | 30 |
| 16290112 | Pond construction | 239 |
| 16290113 | Waterway construction | 94 |
| 16290200 | Railroad and subway construction | 122 |
| 16290201 | Cutting of right-of-way | 45 |
| 16290202 | Railroad and railway roadbed construction | 368 |
| 16290203 | Subway construction | 10 |
| 16290300 | Athletic and recreation facilities construction | 98 |
| 16290301 | Athletic field construction | 62 |
| 16290302 | Golf course construction | 258 |
| 16290303 | Tennis court construction | 187 |
| 16290400 | Land preparation construction | 795 |
| 16290401 | Land leveling | 261 |
| 16290402 | Land reclamation | 243 |
| 16290403 | Rock removal | 63 |
| 16290404 | Timber removal | 129 |
| 16290500 | Industrial plant construction | 303 |
| 16290501 | Chemical plant and refinery construction | 79 |
| 16290502 | Mine loading and discharging station construction | 19 |
| 16290503 | Oil refinery construction | 115 |
| 16290504 | Waste disposal plant construction | 126 |
| 16290505 | Waste water and sewage treatment plant construction | 538 |
| 16299901 | Blasting contractor, except building demolition | 285 |
| 16299902 | Earthmoving contractor | 837 |
| 16299903 | Land clearing contractor | 1,350 |
| 16299904 | Pile driving contractor | 130 |
| 16299905 | Power plant construction | 216 |
| 16299906 | Trenching contractor | 631 |
