Royse City is a city in Rockwall County in the U.S. state of Texas. It also extends into Collin and Hunt counties. and is also part of the Dallas-Fort Worth Metroplex. The population was 2,957 at the 2000 census, rising to 9,349 in 2010. The estimated population in 2018 was 12,998. In 2020, its population grew to 13,508.