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First county election held under provisional Jefferson Territory: Golden City selected as county seat; sheriff, clerk and recorder, and county judge elected.
First school in Jefferson County opens - the Golden City school - in a rented cabin at present-day 1304 Washington Ave.
Golden City Masonic lodge, one of the first Masonic organizations in Colorado, established.
First post office established at Golden City with Dr. Isaac E. Hardy as postmaster.
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 serves as county commissioner 1902-1909.
First major forest fire in Jefferson County. Burns for two months, charring Bear Creek, Turkey Creek and Mount Vernon canyons, and the whole of Green Mountain.
Golden City becomes capital of Jefferson Territory.
Three mining districts form and operate in central Jefferson County to administer extra legal law. Bergen (Bergen Park), Junction (Conifer), and Mt. Vernon (Mt. Vernon Canyon) Districts, then combined under the leadership of Thomas Bergen to form short-lived Ni-Wot County.
Congress combines pieces of Nebraska, Kansas, Utah, and New Mexico to create the Territory of Colorado. William Gilpin appointed governor.
Jefferson County is 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), meet to organize upcoming county election. Original five districts of Jefferson County created.
Major windstorm damages 25 buildings in Golden City.
Election of county officers, including the first elected Board of County Commissioners.
Newly elected County officials assume office.
Jefferson County Commissioners reorganize county internally from five districts to the current three.
First county and school taxes levied by Jefferson County Commissioners.
First jail in Jefferson County built by Walter Pollard.
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.
Locust plague hits the area, devastating everything in its wake.
First devastating flood in Jefferson County. It starts in Deer, Bear, Coal, and Mount Vernon Creeks, drowning thousands of sheep and 19 people in the South Platte. Flood wipes out all bridges on Clear Creek, compelling citizens to use ferries.
Colorado's first railway company, the Colorado Central Railroad Company, incorporated by William A. H. Loveland in Golden City.
Colorado & Clear Creek Railroad Company established.
First Baptist Church chapel, first church building in Golden, dedicated at the SW corner of present-day 12th & Jackson Streets.
Jefferson County has a population of 1,782. Gilpin County has four times that.The Loveland Building, one of the first brick buildings in Golden, is completed.Clay mining begins in Golden with brick making at the Golden Brickworks.
Colorado Transcript, now Golden Transcript, founded by George West in Golden City.
Territorial capital moves from Golden City to Denver City.Astor House in Golden is built.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.
General Ulysses S. Grant visits Golden City with fellow generals Sherman and Sheridan.
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