United States Representatives: http://www.house.gov/writerep/
You will need to select your state from the drop-down menu and then enter your 9 digit zip code (a link is provided to identify the last 4 digits of your zip code, if unknown). Click "Contact My Representative" and his/her contact information will be displayed.
State Senators and Representatives: http://www.statelocalgov.net/index.cfm
Select your state and then select the branch of state government you are looking for.
