Hawaii is about 12 times smaller than South Dakota.

South Dakota is approximately 196,540 sq km, while Hawaii is approximately 16,635 sq km, making Hawaii 8.46% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (546,121 more people live in Hawaii).
Tip: This to-scale comparison of South Dakota vs. Hawaii uses the Mercator projection, which distorts the size of regions near the poles.