Wyoming Statutes

Wyo. Stat. § 31-4-101 (2026)

General prohibitions.

✓ current as of May 2026

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(a) No person shall knowingly operate, nor shall an owner
knowingly permit to be operated, upon any highway any vehicle:

          (i) Unless a valid certificate of title, certificate
of registration and license plates or temporary permits have
been issued for the vehicle except as otherwise provided by this
act;

          (ii) Unless valid license plates or permits issued
for the vehicle are displayed on the vehicle as provided by this
act except as otherwise provided by this act. Validation
stickers shall be properly placed on the vehicle within thirty
(30) days of issuance;

          (iii) With license plates, validation stickers or
license permits altered, mutilated or obscured so as to prevent
the license plate number from being easily read.

     (b) No person shall alter or mutilate any valid license
plate, sticker or permit.

    (c)   Repealed by Laws 1991, ch. 116, § 2.

     (d) No person shall sell or transfer his interest in a
vehicle for which a certificate of title is required unless he
has obtained a certificate and assigns his interest on the title
except as otherwise provided by this act.

     (e) No person shall operate a vehicle in any manner with
an expired or improper registration, permit, decal or any other
department approved registration upon any highway or other
publicly maintained roadway in this state.

Notes of Decisions

Cited in 6 cases (2 in the last 5 years), 1989–2025 · leading case: Hector Zapien-Galvan v. The State of Wyoming, 2023 WY 70 (Wyo. 2023).

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Hector Zapien-Galvan v. The State of Wyoming, 2023 WY 70 (Wyo. 2023). · cites it 4× “Because 6 Wyo. Stat. Ann. § 31-4-101 (e) provides: (e) No person shall operate a vehicle in any manner with an expired or improper registration, permit, decal or any other department approved registration upon any highway or other publicly maintained roadway in this state.”

McClean v. State, 2003 WY 17 (Wyo. 2003). · cites it 4× “§ 31 — 1—101 (a)(viii), is unambiguous and is clearly intended to include the road inside Ponderosa Village Mobile Home Park for the purpose of applying Wyo. Stat. §§ 31-4-101 and 31-7-134? FACTS [¶ 3] On August 27, 2000, Laramie County Sheriff Deputy Dave Skipper was at…”

Nylen v. Dayton, 770 P.2d 1112 (Wyo. 1989). · cites it 2× “Section 11-24-108 provides in pertinent part: (a) No owner or person having custody or charge of livestock shall permit the livestock to run at large in any fenced public highways in Wyoming as defined in W.S. 31-4-101 [§ 31-1-101]. Livestock shall not be picketed on a public…”

Sorensen v. State Farm Auto. Ins. Co., 2010 WY 101 (Wyo. 2010). “" In addition to making it a erime to fail to maintain liability insurance, Chapter 4 makes it unlawful to operate or permit the operation of a vehicle without a valid certificate of title, registration and Heense plates; alter a valid license plate; sell or transfer a vehicle…”

Richard Clark Hanson v. The State of Wyoming, 2025 WY 56 (Wyo. 2025). · cites it 2× “See Wyo. Stat. Ann. §§ 31-4-101 ; -102 (2023).”

United States v. Monje-Contreras, 245 F. App'x 738 (10th Cir. 2007). · cites it 2× “In this regard, the Trooper testified at the suppression hearing that at that point in time he knew he could issue a citation for “temporary registration obscured” under Wyo. Stat. § 31-4-101. 2 The Trooper and the Defendant then returned to the Cherokee and the Defendant…”

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