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republic-os/legal/us/code/title-39/chapter-36/section-3631.md
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Fabio 76b8ec33a7 Legal corpus: the complete U.S. Code (59,740 sections, all 53 titles)
Ingested titles 12–51 and 54 from OLRC USLM XML @119-100 (the whole Code
now, uniform edition; Title 53 is reserved/empty). LegalText 11,221 ->
59,740; repo total 105,704 records. Deterministic (byte-identical rerun,
verified on Title 42's 8,356 sections); make check green. make
legal-us-code default now covers every title.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-06 10:51:44 -04:00

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---
type: "LegalText"
title: "39 U.S.C. § 3631"
description: "Applicability; definitions and updates"
jurisdiction: "us"
corpus: "united_states_code"
kind: "code_section"
title_number: 39
title_name: "POSTAL SERVICE"
chapter_number: "36"
chapter_name: "POSTAL RATES, CLASSES, AND SERVICES"
section: "3631"
citation: "39 U.S.C. § 3631"
status: "current"
release_point: "119-100"
release_date: "2026-06-26"
source: "official"
source_url: "https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc39@119-100.zip"
source_identifier: "/us/usc/t39/s3631"
source_file: "data/legal/raw/us/code/title-39/usc39.xml"
source_hash: "dd41a6be66def69c2ff7d7e92b398ca7d42a05fd9776db4471b856c36f72be65"
raw_snapshot_hash: "ccea35969be78d053165f1170bf2aa826a68e5b4dea1fe3356d8a09e86e19a65"
text_hash: "381507af9f291acc284e86c76080b7bb24c2cab4b36d2839902fcb05b5cf022a"
retrieved_at: "2026-07-04"
confidence: "official"
tags: ["legal", "us-code"]
---
# 39 U.S.C. § 3631 - Applicability; definitions and updates
## Text
(a) Applicability.— This subchapter shall apply with respect to—
(1) priority mail;
(2) expedited mail;
(3) bulk parcel post;
(4) bulk international mail; and
(5) mailgrams;
subject to subsection (d) and any changes the Postal Regulatory Commission may make under section 3642.
(b) Definition.— For purposes of this subchapter, the term “costs attributable”, as used with respect to a product, means the direct and indirect postal costs attributable to such product through reliably identified causal relationships.
(c) Rule of Construction.— Mail matter referred to in subsection (a) shall, for purposes of this subchapter, be considered to have the meaning given to such mail matter under the mail classification schedule.
(Added Pub. L. 109435, title II, § 202, Dec. 20, 2006, 120 Stat. 3205.)