Roy is a city in Weber County, Utah, United States, on the west side of Interstate 15. The population in 2020 was 39,306; an increase of 6.6…Roy is a city in Weber County, Utah, United States, on the west side of Interstate 15. The population in 2020 was 39,306; an increase of 6.6% from 36,884 at the 2010 census. Roy is part of the Ogden−Clearfield Metropolitan Statistical Area, and is considered a suburb of nearby Ogden, although some small businesses are present in Roy.