U.S. flag

An official website of the United States government

end of header

Foreign Trade

Skip top of page navigation
You are here: Census.govBusiness & IndustryForeign Trade › Reference Codes

Reference Codes

Advanced Technology Products (ATP)

IATA Codes

American Iron and Steel Group Product Codes


These files include most current 10-digit HTS import and export codes as well as equivalent codes in other classification systems. Please read the STRUCTURE files below to know which calssification systems are included. These files include codes that are not valid in AES. AES users should use the files available from the AES Document Library.

(These five files are included in "ZIP ASCII file Schedule B/HTSUS" which is listed under "Schedule B Search Engine - Downloads")

The 2014, 2013, and 2012 concordance files below were updated on July 7, 2015 to reflect a change in NAICS assignments.

Concordance Files for 2022

Concordance Files for 2021

Concordance Files for 2020

Concordance Files for 2019

Concordance Files for 2018

Concordance Files for 2017

Concordance Files for 2016

Concordance Files for 2015

Concordance Files for 2014

Concordance Files for 2013

Concordance Files for 2012

Interactive Concordance

Country Sub-Codes (Import)

End-use codes

Harmonized Tariff Schedule of the United States


Rate Provision

Schedule C

Schedule C: Country codes and descriptions.

Schedule D

Schedule D: U.S. Customs districts/ports, codes and descriptions.

Schedule K



Source: U.S. Census Bureau | Foreign Trade | ftdwebmaster@census.gov |  Last Revised: March 20, 2024