have.
An article in the British "Financial Times" stated that American fast food brands have set their sights on China's third- and fourth-tier cities. KFC and McDonald's are now opening new stores in China at a rate of more than one per day.
Therefore, fourth-tier cities have KFC.
According to a query on KFC’s official website, KFC opened in Fengqiu, Xinxiang, Henan (a fourth-tier city) on August 7, 2020.