Fremont County, Kansas Territory

In July 1858, gold was discovered along the South Platte River in Arapahoe County of Kansas Territory (now in Colorado), precipitating the Pike's Peak Gold Rush.

Fremont County was named in honor of soldier, explorer, and politician John Charles Frémont.

Many residents of the mining region felt disconnected from the territorial government, and they formed their own Territory of Jefferson on October 24, 1859.

Following the Republican Party election victories in 1860, the United States Congress admitted Kansas to the Union.

[1] The Kansas Act of Admission excluded the portion of the Kansas Territory west of the 25th meridian west from Washington from the new state, and Fremont County and the rest of this region reverted to unorganized territory.