U.S. Census Bureau Data API MCP

This one is published by the U.S. Census Bureau itself and released under CC0, which settles the usual question of whether a statistics connector is authoritative. The design choice worth noting is that first-time setup runs a Docker migration and seed step that pulls dataset metadata into a local database, so discovering which datasets and geography levels exist is a local lookup rather than a round trip on every question. Tools follow the order a real query needs: list-datasets, then fetch-dataset-geography for the levels a dataset supports, then fetch-aggregate-data. A separate resolve-geography-fips tool turns a place name into the FIPS codes without which an aggregate request is simply invalid. A free Census API key is required.