If you have a question or concern for your congressman or senator, you may contact them by email via the official House and Senate websites. Go to www.house.gov. The official website of the United States House of Representatives. It includes a list of all House members, as well as committees and legislative activities. Enter your postal code. When addressing a letter to a lawmaker, use "The Honorable," followed by the representative's complete name and business address. In both letters and emails, use "Dear Mr./Mrs./Ms." followed by the representative's last name as the salutation.