South Carolina is about 1,659 times bigger than Pitcairn Islands.

Pitcairn Islands is approximately 47 sq km, while South Carolina is approximately 77,983 sq km, making South Carolina 165,821% larger than Pitcairn Islands. Meanwhile, the population of Pitcairn Islands is ~50 people (4.6 million more people live in South Carolina).
Tip: This to-scale comparison of Pitcairn Islands vs. South Carolina uses the Mercator projection, which distorts the size of regions near the poles.