Massachusetts is divided into nine congressional districts, each represented by a member in the United States House of Representatives. These districts are designed to ensure fair representation based on population, with adjustments made every ten years following the census. Each district encompasses various cities and towns, reflecting the state's diverse communities. For example, the 1st Congressional District includes parts of Western Massachusetts, while the 7th Congressional District covers areas in Boston. This structure allows residents to have a direct voice in federal legislation through their elected representatives.