Delaware is about 388 times smaller than Mexico.

Mexico is approximately 1,964,375 sq km, while Delaware is approximately 5,060 sq km, making Delaware 0.26% the size of Mexico. Meanwhile, the population of Mexico is ~129.2 million people (128.3 million fewer people live in Delaware).
Tip: This to-scale comparison of Mexico vs. Delaware uses the Mercator projection, which distorts the size of regions near the poles.