Oman is about 2.5 times bigger than New York.

New York is approximately 122,283 sq km, while Oman is approximately 309,500 sq km, making Oman 153% larger than New York. Meanwhile, the population of New York is ~19.4 million people (15.6 million fewer people live in Oman).
Tip: This to-scale comparison of New York vs. Oman uses the Mercator projection, which distorts the size of regions near the poles.