census-mcp-server

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Tools

7 tools covering the full Census data workflow — from dataset discovery and variable search through geography resolution and ranked comparisons:

Tool	Description
census_list_datasets	Browse available Census Bureau datasets (ACS5, ACS1, Population Estimates, Decennial) with vintage years and dataset codes.
census_list_geographies	List the geography levels supported by a dataset and year, with parent requirements and example FIPS values.
census_search_variables	Keyword search across variable labels and concept groups. Returns estimate and margin-of-error codes together.
census_get_variable	Fetch full metadata for one or more variable codes — label, concept, predicate type, universe, MOE sibling.
census_resolve_geography	Convert place names (e.g., "King County, WA") or street addresses to Census FIPS identifiers via TIGERweb and Census Geocoder.
census_query_data	Query a Census dataset for variables at a specific geography. Returns estimates with MOE, suppression codes resolved to readable reasons.
census_compare_geographies	Rank and compare variables across multiple geographies — all counties in a state, all states nationally, or a named set. Sorted table output.

census_list_datasets

Browse available Census Bureau datasets.

• Returns dataset codes, names, descriptions, and available vintage years
• Covers ACS5, ACS5 Data Profiles, ACS5 Subject Tables, ACS1, ACS1 Data Profiles, Population Estimates, Decennial Redistricting (P.L. 94-171), and Decennial DHC
• Accepts an optional keyword filter
• Dataset codes (e.g., acs/acs5) are the values to pass to other tools

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census_search_variables

Search Census variables by keyword.

• Full-text search across label and concept fields with relevance scoring (exact concept match > label match > partial)
• Returns estimate (E suffix) and margin-of-error (M suffix) codes together so both can be requested in one query
• Configurable limit (default 20, max 100); total_matches indicates how many matched before the limit
• Cache-backed: variables.json is fetched once per dataset+year with a configurable TTL (default 24h)

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census_resolve_geography

Convert place names and addresses to Census FIPS identifiers.