Tega Cay is a planned city in York County, South Carolina, United States, located west of Fort Mill and north of Rock Hill. It is a suburb of Charlotte, North Carolina. The population was recorded at 12,832 as of the 2020 U.S. Census.

York County is a county on the north central border in the U.S. state of South Carolina. As of the 2020 census, the population was 282,090, making it the seventh-most populous county in the state. Its county seat is the city of York, and its most populous community is Rock Hill. The county is served by one Interstate Highway, Interstate 77.