Collinston is an unincorporated community in Box Elder County, Utah, United States. Mainly an agricultural community, the town is located 3 miles (4.8 km) southeast of Fielding and almost directly west of Riverside, at coordinates 41°46′29″N 112°5′42″W / 41.77472°N 112.095°W / 41.77472; -112.095 (441.7746496, -112.0949517).. Its elevation is 4,432 feet (1,351 m). Although it is unincorporated, it has a post office, with the ZIP code of 84306. Collinston is mentioned as the approximate location where Captain John C. Frémont crossed the Bear River in 1843.