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

District of Columbia is approximately 177 sq km, while American Samoa is approximately 224 sq km, making American Samoa 27% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (556,280 fewer people live in American Samoa).
Tip: This to-scale comparison of District of Columbia vs. American Samoa uses the Mercator projection, which distorts the size of regions near the poles.