What is the salutation for congressman?

Answer 1

The Honorable Firstname Surname

Dear Mr./Ms. Surname,

Sincerely yours,

http://www.librarycat.org/SVLS/html/lawmakers/correct_form.html

Do address to "The Honorable" but Do NOT put Mr. or Ms. (and certainly not Mrs.) on the salutation after Dear when addressing someone who has been voted to the US Senate or House of Representatives. Use their title, such as Senator, Congressman/Congresswoman or Representative followed by their last name.

http://www.ita.doc.gov/ita_sec/Address%20and%20Salutation.htm