Is Washington, D.C. a Primate City? No.

A primate city is disproportionately larger than any other city in its country (typically >2x the second-largest).

Washington, D.C. (metro ~6.3M) is not a primate city. The U.S. has multiple massive metros:

• New York (~20M)
• Los Angeles (~13M)
• Chicago (~9M)
• Dallas, Houston, Philadelphia, Miami, Atlanta—all larger or comparable.

D.C. is the political capital, but not the demographic or economic primate. Classic primate cities: Paris, London, Tokyo, Mexico City, Bangkok.