Uruguay is around the same size as South Dakota.

South Dakota is approximately 196,540 sq km, while Uruguay is approximately 176,215 sq km, making Uruguay 89.66% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (2.6 million more people live in Uruguay).
Tip: This to-scale comparison of South Dakota vs. Uruguay uses the Mercator projection, which distorts the size of regions near the poles.