Congressional district lines are drawn to concentrate votes — which means your address has a political value you probably don't know about. If you're moving, it might be worth checking.
Margins reflect the 2024 presidential result in each congressional district. Competitiveness ratings based on Cook Political Report. Impact is calculated from district margin: in a closer race, each vote is a larger share of the deciding margin. Residency requirements vary — always verify with your local election authority.