Fayette City is a borough in Fayette County, Pennsylvania, United States. The population was 502 at the 2020 census, a decline from the figure of 596 tabulated in 2010. It is served by the Belle Vernon Area School District. Some buildings in the town antedate 1820. Herbert Vargo Jr. is the current mayor. His term ends in 2025. He was first elected to the office in 1993.