Greece is approximately 131,957 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 6.9% the size of Greece. Meanwhile, the population of Greece is ~10.6 million people (7.4 million fewer people live in Puerto Rico).
This to-scale map shows a size comparison of Greece compared to Puerto Rico. For more details, see an in-depth quality of life comparison of Puerto Rico vs. Greece using our country comparison tool.