Guyana is around the same size as Idaho.

Idaho is approximately 214,314 sq km, while Guyana is approximately 214,969 sq km, making Guyana 0% larger than Idaho. Meanwhile, the population of Idaho is ~1.6 million people (777,899 fewer people live in Guyana).
Tip: This to-scale comparison of Idaho vs. Guyana uses the Mercator projection, which distorts the size of regions near the poles.