| Naics index | Naics index description |
|---|---|
| 488310 | Harbor maintenance services (except dredging) |
| 488310 | Harbor operation |
| 488310 | Lighthouse operation |
| 488310 | Maintenance services, waterfront terminal (except dredging) |
| 488310 | Port facility operation |
| 488310 | Seaway operation |
| 488310 | Waterfront terminal operation (e.g., docks, piers, wharves) |
| 488310 | Wharf operation |
| 488320 | Loading and unloading services at ports and harbors |
| 488320 | Longshoremen services |