By 1858, farmers from the then-settled towns of Lehi and Kay's Creek, looking for a new place to homestead, began considering the area now known as Plain City.

On 17 March 1859, led by Lorin Farr, a group arrived to begin homesteading.

[5] Plain City residents were responsible for the creation and growth of several nationwide trucking companies: According to the United States Census Bureau, the city has a total area of 11.73 square miles and 0.23 square miles of water.

Plain City is bordered by Farr West to the east, South Willard to the north, Marriott-Slaterville to the south, and the unincorporated townships of Warren and West Weber to the southwest.

According to 2022 estimates, 29.4% of Plain City residents hold a bachelor's degree or higher, noticeably lower than the Utah state average of 37.9%.

The median income for all residents was $120,250, significantly higher than the estimated average taken at the 2000 Census.

The original Plain City Elementary, built in 1906, was abandoned in 2007 to make way for the new building.

Media related to Plain City, Utah at Wikimedia Commons