How to find your Member of Congress:
To find your member of the House of Representatives: http://www.house.gov/representatives/find/
To find your member of the Senate: https://www.senate.gov/senators/contact/
5calls.org helps you find your representative by your location, gives suggested scripts for calling based on your issue of concern, and allows you to log the success of your call. It can also be found in the App Store and on Google Play.