Everyone has a Representative and two Senators at the federal (national) level, determined by the state and district where you live. To find out their names and contact information, try these links:

http://www.congress.org/

http://www.senate.gov/

http://www.house.gov/

http://www.house.gov/writerep/

http://www.vote-smart.org/

Congressional Switchboard: 202-224-3121