Alaska is about 3,193 times bigger than Northern Mariana Islands.

Northern Mariana Islands is approximately 464 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 319,156% larger than Northern Mariana Islands. Meanwhile, the population of Northern Mariana Islands is ~51,475 people (658,756 more people live in Alaska).
Tip: This to-scale comparison of Northern Mariana Islands vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.