A good place to locate a congressional district as of 2015 is the United States House of Representative website. This is a government operated site.
Users can input a zip code which searches for the appropriate congressional district. The zip code locator also provides the name of the Representative in a specific district.
The United States House of Representative website can also search for a member's public email addresses, which are used for correspondence with the public. Users can easily locate the homepage dedicated to their Representative. Homepages provide biographical information, mailing addresses, email addresses, telephone numbers and party affiliation.
The website is free and simple to use. Live stream video is available for House floor proceedings and sessions. A list of committees as well as their members are also available. Updates and news on current and important legislative activity is included on the website.
In the U.S., congressional districts are determined by the population of an area. Districts can change after the Census, which is performed every 10 years. As of 2015, there are 435 congressional districts in the U.S., and each district includes and represents an average of 700,000 people. There are five additional territories that send representatives, but they do not have voting privileges.