United States is approximately 9,833,517 sq km, while Poland is approximately 312,685 sq km, making Poland 3.18% the size of United States. Meanwhile, the population of United States is ~332.6 million people (294.4 million fewer people live in Poland).
This to-scale map shows a size comparison of United States compared to Poland. For more details, see an in-depth quality of life comparison of Poland vs. United States using our country comparison tool.