Federal government of the United States
One house is the United States House of Representatives (often just called "The House").  The House of Representatives is made up of Representatives (also called Congressmen). They are each elected by voters from their own state. Each state has a different number of Representatives.  The number depends on how many people live in the state.  The more people a state has, the more representatives it gets. Every 10 years, the U.S. Census Bureau does a census, or count, of the population of the United States. States may gain or lose Representatives if the Census shows that the state's population has changed.  As of 2016, there are 435 Representatives in the House.