Michigan is about 8 times smaller than Indonesia.

Indonesia is approximately 1,904,569 sq km, while Michigan is approximately 250,493 sq km, making Michigan 13.15% the size of Indonesia. Meanwhile, the population of Indonesia is ~277.3 million people (267.4 million fewer people live in Michigan).
Tip: This to-scale comparison of Indonesia vs. Michigan uses the Mercator projection, which distorts the size of regions near the poles.
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