Local bus service in Union City began in 1974 as "The Flea".[2] It was originally operated by Patterson Transit, which was renamed Union City Transit in 1975.[3] Another operator took over in 1982, but the bus service kept the name Union City Transit.[4][5] Due to the COVID-19 pandemic, Union City Transit was reduced from eight routes to five in March 2021.[6] The name "Flea" was revived for a demand responsive transit service added in September 2023.[7]