How can I send a letter to the president of the US
user
You can certainly write a letter to the president of the US, or to your own Congressperson.
assistant
What is the address?
user
I’m not sure what you mean by “address”, but perhaps you are looking for their official White House address:

The White House
1600 Pennsylvania Avenue NW
Washington, DC 20500
United States
assistant
How can I send a letter to the president of the US
user
You can certainly write a letter to the president of the US, or to your own Congressperson.
assistant
What is the address?
user
You can write to the president’s residence in Washington, DC at:   https://www.whitehouse.gov/contact
assistant
How can I send a letter to the president of the US