Collinston is an unincorporated community on the northeastern edge of Box Elder County, Utah, United States. Mainly an agricultural community, the town is located 3 miles southeast of Fielding and almost directly west of Riverside, at coordinates 41°46′29″N 112°5′42″W / 41.77472°N 112.09500°W. Its elevation is 4,432 feet. It has a post office with the …Collinston is an unincorporated community on the northeastern edge of Box Elder County, Utah, United States. Mainly an agricultural community, the town is located 3 miles southeast of Fielding and almost directly west of Riverside, at coordinates 41°46′29″N 112°5′42″W / 41.77472°N 112.09500°W. Its elevation is 4,432 feet. It has a post office with the ZIP code 84306.