How many members of the House are up for election every 2 years?

In the United States, the House of Representatives is comprised of 435 members, and every member serves a two-year term. Because of this structure, all members of the House are up for election every two years. This frequency ensures that the entire chamber has the opportunity to be responsive to the electorate's needs and sentiments, as they must seek re-election to maintain their positions.

This system also allows for greater accountability and adaptability in governance, reflecting changes in public opinion and political landscapes in a relatively short period.