Rhode Island is around the same size as Luxembourg.

Luxembourg is approximately 2,586 sq km, while Rhode Island is approximately 2,706 sq km, making Rhode Island 5% larger than Luxembourg. Meanwhile, the population of Luxembourg is ~650,364 people (402,203 more people live in Rhode Island).
Tip: This to-scale comparison of Luxembourg vs. Rhode Island uses the Mercator projection, which distorts the size of regions near the poles.