Mississippi is about 1.4 times bigger than United Arab Emirates.

United Arab Emirates is approximately 83,600 sq km, while Mississippi is approximately 121,489 sq km, making Mississippi 45% larger than United Arab Emirates. Meanwhile, the population of United Arab Emirates is ~9.9 million people (6.9 million fewer people live in Mississippi).
Tip: This to-scale comparison of United Arab Emirates vs. Mississippi uses the Mercator projection, which distorts the size of regions near the poles.