Washington is about 1.2 times smaller than Belarus.

Belarus is approximately 207,600 sq km, while Washington is approximately 172,348 sq km, making Washington 83.02% the size of Belarus. Meanwhile, the population of Belarus is ~9.4 million people (2.7 million fewer people live in Washington).
Tip: This to-scale comparison of Belarus vs. Washington uses the Mercator projection, which distorts the size of regions near the poles.