A constituency is an area whose voters elect a representative to a legislative body. It can also refer to the group of people whose interests an elected official represents. A constituency can be described as the population living in a district, state, or region, or any smaller section of that population, such as individuals or small groups advocating for specific issues. In the United Kingdom, a parliamentary constituency is a district that elects a member of parliament. In the United States, a constituency is called a "Congressional district" and each district elects one member to the House of Representatives.