The people in districts who are represented in Congress are called constituents. Constituents are people who elect a congressperson to represent them, and elected leaders connect their voters to the government.
An electoral district is also known as a constituency, and the people within a particular residency are authorized to vote in a district race. Citizens elect congressional representatives every two years, and incumbent congressmen try to convince voters to send them back to Congress. Constituents send letters and emails to their representatives expressing approval or disapproval of their congressional records. There are also congressional staff members who handle incoming communications from voters. Congressmen also serve the role of legislating on behalf of the entire country while representing the people who voted them into office.