Royse City is a city in Rockwall County in the U.S. state of Texas. It also extends into Collin and Hunt counties. 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.

Rockwall County is a county in the U.S. state of Texas. At 149 square miles, Rockwall County has the smallest area of any Texas county. Per the 2020 Census, its population was 107,819. Its county seat is Rockwall. The county and city are named for a wall-like subterranean rock formation that runs throughout the county.