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Big Horn County was organized in 1897
Created by the legislature of Wyoming Territory in March 1890, it was organized in 1897; its area was annexed from Fremont, Johnson, and Sheridan counties.
Big Horn County was named for the Big Horn Mountains which form its eastern boundary.
Originally, the county included the entire Big Horn Basin, but in 1909 Park County was created from a portion of Big Horn County, and in 1911 Hot Springs and Washakie counties were created from portions of Big Horn, leaving the county with its present borders

The County Seat is Basin 
Towns
Basin ~ Burlington ~ Byron ~ Cowley ~ Deaver ~ Frannie ~ Greybull ~ Lovell ~ Manderson

Census-designated places
Hyattville ~ Shell

Unincorporated Communities
Emblem ~ Kane ~ Otto ~ Meadow Lark Lake ~ Reeves Corner

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Park County, Wyoming - west
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Sheridan County, Wyoming - east
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