In the United States, a total of 435 members are elected into the House of Representatives every two years. This number used to change because it was dependent on the population of the states, but the number was fixed in 1911.
The requirements for a candidate to be able to run for an office with the House of Representatives are that he should be at least 25 years old, should have been an American citizen for a minimum of 7 years and be a resident of the state he is running for at the time of the election.
The number of representatives from each state depends on its population. Some states only have one representative, such as Vermont and Delaware, while some could have as many as 53 representatives, like California.