Address of the whitehouse

The White House is found in the capital city of Washington, DC.

The street address is

1600 Pennsylvania Ave NW

Washington, DC 20500

USA

Note that the national capital city of Washington is in the federal District of Columbia (DC) which is not part of any state but borders Maryland and Virginia.
1600 Pennsylvania Avenue NW Washington, DC 20500 is the address of the President's house, aka the White House and the Executive Mansion.