Use thousandth in a sentence. 1  coming last in a series of a thousand; 1,000th. 2  designating any of the thousand equal parts of something.
For other uses, see Brigham City (disambiguation). Brigham City is a city in Box Elder County, Utah, United States. The population was 17,899 at the 2010 census. It is the county seat of Box Elder County. It lies on the western slope of the Wellsville Mountains, a branch of the Wasatch Range at the western terminus of Box Elder Canyon.
I-15 passes through Idaho for 196 miles (315 km). Interstate 15 crosses the Utah state line in Oneida County. The highway runs through Pocatello, Blackfoot, and Idaho Falls, intersecting with Interstate 86. The last county in Idaho that Interstate 15 passes through is Clark County.-15 continues through Utah for 401 miles (645 km). It is the main northâsouth connection for the state. The highway approximately follows the old alignment of U.S. Highway 91 from St. George to Brigham City.