In political terms, nothing. Both are political entities owned by the federation as a whole and are the cities where the political powers (executive, legislative, supreme court) reside.
In other terms, Washington DC is a medium-sized city with 618,000 inhabitants, while Mexico City is a megalopolis with 21.16 million inhabitants.
One is in Mexico and one is in America.
mexico city
Washington DC is north of Mexico City.
Mexico is an independent country, south of the United States. Washington DC is a city for which the city proper belongs to the Union, instead of being part of a given state.
Mexico City and Washington, DC, respectively.
Mexico City and Washington DC, respectively.
Driving distance from Mexico City, Mexico to Washington DC is 2467 miles.
23457653498267435 milimeters
Distance between Washington DC and Ottawa is 734 kilometers (456 miles), straight line. Distance from Washington DC to Mexico City is 3,034 kilometers (1,885 miles).Ottawa is clearly much closer to DC.
Mexico City and Washington DC are national capital cities, while NYC is not.
It is a Federal District, much like Washington DC.
The United States qualifies as such. Its capital is Washington, DC.