---
kind: "unit"
title: "19"
title_heading: "Customs Duties"
key: "ch4/stIII/ptI"
level: "part"
label: "Part I"
heading: "Definitions and National Customs Automation Program"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/19/ch4-stIII-ptI"
sections_count: 8
---

# Part I — Definitions and National Customs Automation Program

Title 19 — Customs Duties › Chapter 4 — Tariff Act of 1930 › Subtitle III — Administrative Provisions

## Contents

- [Subpart a — definitions](/usc/19/ch4-stIII-ptI-spta.md)
- [Subpart b — national customs automation program](/usc/19/ch4-stIII-ptI-sptb.md)