Horry County is the easternmost county in the U.S. state of South Carolina. As of the 2020 census, its population was 351,029. It is the fourth-most populous county in South Carolina. The county seat is Conway. Horry County is the central county in the Myrtle Beach-Conway-North Myrtle Beach, SC Metropolitan Statistical Area. It is in the Pee Dee region of South Carolina, about 90 miles north of Charleston, and about 130 miles east of the state capital, Columbia.