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First county election, under provisional Jefferson Territory: Golden City selected as county seat; also elected a sheriff, clerk and recorder, and county judge.
First school in Jefferson County opened in Golden City.
Golden City Masonic lodge, one of the first Masonic organizations in Colorado, established.
All time hottest temperature in Jefferson County of 104 degrees recorded in Golden City.
Birth of Charles L. Palmer, reputedly the first child of gold rush settlers to be born in Jefferson County. He served as county commissioner, 1902-1909.
Golden City becomes capital of Jefferson Territory.
Three mining districts formed and operated in central Jefferson County to administer extra legal law. Bergen District (Bergen Park), Junction District (Conifer), and Mt. Vernon District (Mt. Vernon Canyon) then combined under the leadership of Thomas Bergen to form short-lived Ni-Wot County.
President James Buchanan signs bill creating the Territory of Colorado.
Jefferson County reorganized to become one of the original 17 counties created by Colorado Territorial Legislature.
Original Jefferson County Commissioners, John M. Ferrell, Spafford C. Field and George H. Richardson, appointed by Gov. William Gilpin and meet to organize upcoming county election.
Great windstorm destroys 25 buildings in Golden City.
Election of county officers, including the first Board of County Commissioners.
Newly elected County officials assume office.
First county tax and school tax levied by Jefferson County Commissioners.
Golden City becomes capitol of the Territory of Colorado, remains so until 1867.
Henry Stevens, the first recorded homesteader in Jefferson County under the 1863 Homestead Act, builds his cabin at the current site of 44th and Teller streets in Wheat Ridge.
Colorado's first railway company, the Colorado Central Railroad Company, incorporated by William A. H. Loveland in Golden City.
Colorado Transcript, now the Golden Transcript, founded by George West in Golden City.
Last documented encampment of Arapaho tribe, led by Chief Friday, in Jefferson County.
Golden Paper Mills, only paper mill west of Missouri, established at Golden City, making paper from recycled rags and straw.
Golden City celebrates the ground breaking for the first railroad construction in Colorado, by the Colorado Central Railroad Company.
Jarvis Hall, first college in Jefferson County, established.
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