History Dawson County was the tenth county organized in Montana Territory. It was created January 15, 1869, four and a half years after Montana Territory was organized. Before the formation of Dawson county, the area was the northern half of the original Big Horn County. Dawson takes its name from Major Andrew Dawson, manager of the Fort Benton Trading Post for the American Fur Company from 1856 to 1864.
history dawson county was the tenth county organized in montana territory it was created january 15 1869 four and a half years after montana territory was organized before the formation of dawson county the area was the northern half of the original big horn county dawson takes its name from major andrew dawson manager of the fort benton trading post for the american fur company from 1856 to 1864