Rhode Island is about 5 times smaller than Montenegro.

Montenegro is approximately 13,812 sq km, while Rhode Island is approximately 2,706 sq km, making Rhode Island 19.59% the size of Montenegro. Meanwhile, the population of Montenegro is ~604,966 people (447,601 more people live in Rhode Island).
Tip: This to-scale comparison of Montenegro vs. Rhode Island uses the Mercator projection, which distorts the size of regions near the poles.
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