Utah is about 1.2 times smaller than Western Sahara.

Western Sahara is approximately 266,000 sq km, while Utah is approximately 212,751 sq km, making Utah 79.98% the size of Western Sahara. Meanwhile, the population of Western Sahara is ~612,000 people (2.9 million more people live in Utah).
Tip: This to-scale comparison of Western Sahara vs. Utah uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.