Jefferson Territory

The Provisional Government of the Territory of Jefferson was an extralegal and unrecognized United States territory that existed in the Pike's Peak mining region from October 24, 1859, until it yielded to the new Territory of Colorado on June 6, 1861. The Jefferson Territory included all of the present State of Colorado and portions of the present states of Kansas, Nebraska, Utah, and Wyoming. The people were desirous of a closer government than those five territories provided.

The government of the Jefferson Territory, while democratically elected, was never legally recognized by the United States government, although it managed the territory with relatively free rein for 19 months. Many of the laws enacted by the General Assembly of the Territory of Jefferson were reenacted and given official sanction by the new Colorado General Assembly in 1861.