2022 NAICS national industry in sector 48-49 Transportation and Warehousing
488310 Port and Harbor Operations
NAICS 488310 is the US industry code for port and harbor operations. It covers establishments primarily engaged in operating ports, harbors (including docking and pier facilities), or canals.
- Code
- 488310 (2022 NAICS)
- Title
- Port and Harbor Operations
- Part of
- Support Activities for Water Transportation
- SBA small business limit
- Average annual receipts up to $47 million
- Closest UK SIC
- 52220 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in operating ports, harbors (including docking and pier facilities), or canals.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Providing stevedoring and other marine cargo handling services (except warehousing) are classified in Industry 488320, Marine Cargo Handling.
- Providing navigational services to shipping are classified in Industry 488330, Navigational Services to Shipping.
- Operating docking and/or storage facilities, known as marinas are classified in Industry 713930, Marinas.
Activities listed under 488310
The Census index assigns these 11 activities to this code. If your business matches one, this is your code.
- Canal maintenance services (except dredging)
- Canal operation
- Docking facility operations
- Harbor maintenance services (except dredging)
- Harbor operation
- Lighthouse operation
- Maintenance services, waterfront terminal (except dredging)
- Port facility operation
- Seaway operation
- Waterfront terminal operation (e.g., docks, piers, wharves)
- Wharf operation
SBA size standard for 488310
To count as a small business for SBA loans and federal contracts under NAICS 488310, your business (including affiliates) must not exceed $47 million in average annual receipts. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 5222), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.