Boston is an unincorporated community in southern Barton County, Missouri. It is about halfway between Lamar and Jasper. It is about one mile northeast of the intersection of U.S. Route 71 and Missouri State Highway 126 on county roads. It once had a post office, but mail is now delievered from Lamar. Barton County is a county located in the state of Missouri. ... Lamar is a city located in Barton County, Missouri. ... Jasper is a city located in Jasper County, Missouri. ... U.S. Highway 71 is a north-south United States highway. ... Missouri State Highway 126 is a highway located entirely within Barton County. ...