South Carolina is about 2.3 times smaller than Oklahoma.

Oklahoma is approximately 177,847 sq km, while South Carolina is approximately 77,983 sq km, making South Carolina 43.85% the size of Oklahoma. Meanwhile, the population of Oklahoma is ~4.1 million people (1.4 million more people live in South Carolina).
Tip: This to-scale comparison of Oklahoma vs. South Carolina uses the Mercator projection, which distorts the size of regions near the poles.
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