Exactly how many museums are made up of the Smithsonian Museum in Washington D.C.?

Answer 1

African Art Museum
Air and Space Museum and Udvar-Hazy Center
American Art Museum and its Renwick Gallery
American History Museum
American Indian Museum
Anacostia Community Museum
Arts and Industries Building
Cooper-Hewitt, National Design Museum
Freer and Sackler Galleries
Hirshhorn Museum and Sculpture Garden
National Zoo
Natural History Museum
Portrait Gallery
Postal Museum
Smithsonian Institution Building, the Castle (visitor information)

Future Museums

National Museum of African American History and Culture

Answer 2

The Smithsonian Institution is made up of 17 museums and the National Zoo in the Washington, D.C., metropolitan area, and 2 museums in New York City.

Answer 3

On the mall in DC:
African Art Museum
Air and Space Museum
American Art Museum
Renwick Gallery
American History Museum
National Museum of the American Indian
Arts and Industries Building
Freer Gallery
Sackler Gallery
Hirshhorn Museum and Sculpture Garden
National Zoo
Natural History Museum
Portrait Gallery
Smithsonian Institution Building, the Castle (visitor information)

Elsewhere in D.C.
Anacostia Community Museum
Postal Museum

In Virginia:
Air and Space Museum: Udvar-Hazy Center

In New York City:
Cooper-Hewitt Design Museum
NMAI: George Gustav Heye Center

Answer 4

Here is a complete list of all museums the Smithsonian is afflilated with throughout the world:

http://affiliations.si.edu/Map.Asp?MenuID=7#A

Answer 5

11 in DC and 3 in New York