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The Texas legislature approved the establishment of the county on August 27, 1856, and named it for William H. and Patrick C. Jack, participants in the Texas Revolution. It is the only county with that name in the United States. The Butterfield Overland Mail crossed the county. Fort Richardson, on Lost Creek near the site of present-day Jacksboro, was established by the United States Army in 1867 and completed in 1869. It was the most northern of the Texas frontier forts built to protect pioneers against Indian raids and was abandoned in 1878. Mesquiteville was designated county seat; the town was later renamed Jacksboro.
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