question: Which  county located in the U.S. state of Montana is Brockton  a town in
answer: Roosevelt County
context: Title: Treasure County, Montana
  Passage: Treasure County is a county located in the U.S. state of Montana.  As of the 2010 census, the population was 718, making it the second-least populous county in Montana.  Its county seat is Hysham.  The county was founded in 1919.
  Title: Brockton, Montana
  Passage: Brockton is a town in Roosevelt County, Montana, United States.  The population was 255 at the 2010 census.
  Title: Roosevelt County, Montana
  Passage: Roosevelt County is a county located in the U.S. state of Montana.  As of the 2010 census, the population was 10,425.  Its county seat is Wolf Point.  Roosevelt County was created by the Montana Legislature in 1919 from Sheridan County.  The name honors former president Theodore Roosevelt, who had died shortly before the county was formed.
citations: Roosevelt County, Montana Brockton, Montana