Plain City is a city in Weber County, Utah, United States. The population was 5,476 at the 2010 census. It is part of the Ogden–Clearfield, Utah Metropolitan Statistical Area. The current mayor is Jon Beesley.

Weber County is a county in the U.S. state of Utah. As of the 2020 census, the population was 262,223, making it Utah's fourth-most populous county. Its county seat and largest city is Ogden, the home of Weber State University. The county was named after a fur trapper John Weber.