When Weston County was formed in 1890, Newcastle was the only incorporated town within its borders, and thus became the county seat. Newcastle occupied a strategic location on the main line of the Chicago, Burlington and Quincy Railroad, where a spur line ran to the Kilpatrick Brothers and Collins coal mine, the source of fuel for the railroad’s locomotives. The first county offices were located in the basement of Kilpatrick Brothers and Collins Mercantile in downtown Newcastle.