Mississippi is about 31 times bigger than South Georgia and South Sandwich Islands.

South Georgia and South Sandwich Islands is approximately 3,903 sq km, while Mississippi is approximately 121,489 sq km, making Mississippi 3,013% larger than South Georgia and South Sandwich Islands.
Tip: This to-scale comparison of South Georgia and South Sandwich Islands vs. Mississippi uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Mississippi vs. South Georgia and South Sandwich Islands