The Territory of Wyoming was an organized incorporated territory of the United States that existed from July 25, 1868,[1] until July 10, 1890, when it was admitted to the Union as the State of Wyoming.

Portions of the territory, which eventually fell under Wyoming's jurisdiction, were at various points associated with the territories of Washington, Oregon, Idaho, Dakota, Nebraska, and Utah, and had previously belonged to the independent states of Great Britain, France, Spain, Mexico, and Texas.

The portion of the Wyoming Territory west of the continental divide and north of the 42nd parallel was originally part of the Oregon Country, which was organized into the Oregon Territory in 1848; when Oregon entered the union as a state under its present boundaries in 1859, this land became part of the Washington Territory.

The southwestern corner of what became the Wyoming Territory, south of the 42nd parallel, became part of the United States with the 1848 Mexican Cession.

[3] In 1869 the territory granted women's suffrage for all elections in an attempt to attract new settlers.