District of Columbia is about 1.3 times smaller than American Samoa.

American Samoa is approximately 224 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 79.02% the size of American Samoa. Meanwhile, the population of American Samoa is ~45,443 people (556,280 more people live in District of Columbia).
Tip: This to-scale comparison of American Samoa vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.