---
kind: "section"
citation: "15 U.S.C. § 264"
title: "15"
title_heading: "Commerce and Trade"
number: "264"
heading: "Part of Idaho in fourth zone"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/15/264"
units:
  - "Chapter 6 — Weights and Measures and Standard Time"
  - "Subchapter IX — Standard Time"
---

# §264. Part of Idaho in fourth zone


In the division of territory, and in the definition of the limits of each zone, as provided in sections [261](/usc/15/261.md) to 264 of this title, so much of the [State](/usc/15/15g.md?p=2) of Idaho as lies south of the Salmon River, traversing the [State](/usc/15/15g.md?p=2) from east to west near forty-five degrees thirty minutes latitude shall be embraced in the fourth zone: Provided, That common carriers within such portion of the [State](/usc/15/15g.md?p=2) of Idaho may conduct their operations on Pacific time.


## Source credit

(Mar. 19, 1918, ch. 24, § 3, as added Mar. 3, 1923, ch. 216, 42 Stat. 1434; amended June 24, 1948, ch. 631, § 1, 62 Stat. 646; Pub. L. 110–69, title III, § 3013(c)(4), Aug. 9, 2007, 121 Stat. 599.)

## Notes

### Editorial Notes

### Prior Provisions

The original section 3 of act Mar. 19, 1918, providing for daylight-savings, was repealed by act Aug. 20, 1919, ch. 51, 41 Stat. 280.

### Amendments

2007—Pub. L. 110–69 substituted “fourth zone” for “third zone”.

1948—Act June 24, 1948, inserted proviso relating to common carriers.

### Statutory Notes and Related Subsidiaries

### Effective Date of 1948 Amendment

Act June 24, 1948, ch. 631, § 2, 62 Stat. 646, provided that: “This Act [amending this section] shall take effect at 2 o’clock antemeridian of the second Monday following the date of its enactment.”