Territorial evolution of Utah

Updated on Dec 30, 2024

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The following timeline traces the territorial evolution of the U.S. State of Utah.

Timeline

Historical territorial claims of Spain in the present State of Utah:

Santa Fé de Nuevo Méjico, 1598–1821

Gran Cuenca, 1776–1821

Adams-Onís Treaty of 1819

Historical territorial claims of Mexico in the present State of Utah:

Santa Fé de Nuevo México, 1821–1848

Gran Cuenca, 1821–1848

Historical political divisions of the United States in the present State of Utah:

Unorganized territory created by the Treaty of Guadalupe Hidalgo, 1848–1850

State of Deseret (extralegal), 1849–1850

Territory of Utah, 1850–1896

Utah Organic Act, September 9, 1850

Eastern portion of the Utah Territory is incorporated into the new Territory of Colorado, February 28, 1861

Western portion of the Utah Territory is incorporated into the new Territory of Nevada, March 2, 1861

North-eastern portion of the Utah Territory is transferred to the Territory of Nebraska, March 2, 1861

Western 53 miles of the Utah Territory is transferred to the Territory of Nevada, July 14, 1862

Another 53 miles of the Utah Territory is transferred to the State of Nevada, May 5, 1866

North-eastern corner of the Utah Territory is incorporated into the new Territory of Wyoming, July 25, 1868

Utah Enabling Act, July 16, 1894

Territory of Jefferson (extralegal), 1859–1861

State of Utah since January 4, 1896

(Text) CC BY-SA