Mapbox Boundaries offers a comprehensive dataset of four million expertly curated boundaries worldwide, enabling users to enhance geospatial analysis and visualizations by joining geographic data to specific polygons. Unlike traditional boundary data, which can be overly simplistic and lead to inaccuracies, Mapbox Boundaries ensures that polygons are precisely aligned with adjacent boundaries, facilitating consistent analysis at any level of granularity. The latest update includes a new collection of U.S. legislative boundaries, such as Congressional districts and state legislatures, which enhance data analysis and visualizations. These boundaries are categorized into five data types: administrative, legislative, locality, postal, and statistical, allowing for versatile data aggregation and analysis. The dataset's metadata supports efficient data filtering and performance optimization, including features like globally unique IDs, regional display requirements, and various identifiers and translations. Analysts can leverage these resources to perform in-depth geospatial analysis and create custom polygons to suit specific applications.