District of Columbia is about 1,405 times smaller than Oregon.

Oregon is approximately 248,631 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.07% the size of Oregon. Meanwhile, the population of Oregon is ~3.8 million people (3.2 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Oregon vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.