Congressional district

A congressional district is an electoral constituency that elects a single member of a congress. Countries with congressional districts include the United States, the Philippines, and Japan. A congressional district is based on population, which, in the United States, is taken using a census every ten years.

Japan

 * Main article: List of Districts of the House of Representatives of Japan.

Philippines

 * Main article: Legislative districts of the Philippines.

United States

 * Main article: List of United States congressional districts.

There are 435 congressional districts in the United States House of Representatives, with each one representing approximately 600,000 people. The Census Bureau within the United States Department of Commerce conducts a decennial census whose figures are used to determine the number of congressional districts within each state.