Lewiston is a city in Cache County, Utah, United States. It is situated at the northern Utah border and borders the state of Idaho. The population was 1,766 at the 2010 census. It is included in the Logan, Utah-Idaho (partial) Metropolitan Statistical Area.

The Logan Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of two counties – one in Utah and one in Idaho, anchored by the city of Logan. As of the 2010 census, the MSA had a population of 125,442. As of the 2020 Census, the population had risen to 147,908, and further expanded to an estimated 155,362 as of 2022. The Logan metropolitan area is colloquially called Cache Valley, where most of the population resides.