MCP server exposing 6 tools for census.
This URL is a JSON-RPC 2.0 endpoint over HTTP. Issue POST requests with a JSON-RPC body. Browsers and search crawlers land here on GET.
POST https://gateway.pipeworx.io/census/mcp
Content-Type: application/json
{"jsonrpc":"2.0","id":1,"method":"tools/list"}census_population — HOW MANY PEOPLE LIVE somewhere in the United States — the population of a county, city, town, ZIP code or state from the American Community Survey. Answers "population of Travis County Texas", "how many people live in Austin", "what is the population of 78701", "Ohio population". Say the place the way a person says it ("Travis County, TX", "Austin, TX", "78701", "Texas"); no FIPS codes and no variable codes needed. Also returns median age, household count and median household income for the same place when the survey publishes them. Figures are 5-year survey estimates, so they describe a period rather than a census-day headcount. For what homes cost or rent there, use census_acs.census_acs — Median home value and median rent for a US ZIP CODE, city, town, county or state, from the American Community Survey — the keyless way to answer "what do homes cost in 33158" or "median home price in Miami-Dade County" at a grain below metro level. Pass the geography the way a person says it: a 5-digit ZIP ("33158"), a place with its state ("Palmetto Bay, FL"), a county ("Miami-Dade County, FL"), or a state ("Florida"); FIPS codes and raw Census "for" syntax also work. Median home value is B25077_001E and median gross rent is B25064_001E (B25003 is tenure counts, not rent); the same call also serves ownership rates, vacancy and any other ACS variable code. Values are 5-year survey estimates, so they describe a period rather than this month's asking prices.census_building_permits — Check monthly building permits for new residential construction by geography. Returns count of authorized privately-owned housing units and construction activity trends.census_housing_starts — Get residential construction pipeline by geography: new starts, units under construction, and completed units. Returns housing supply and activity trends.census_homeownership — US homeownership rate and housing vacancy rates by quarter, from the Census Housing Vacancy Survey (HVS) — the official source. Returns `headline` (the national homeownership rate as a percent) plus the rental and homeowner vacancy rates. Defaults to the latest published quarter.census_available_datasets — Discover Census datasets and their variables. Returns dataset names, descriptions, and variable codes (e.g., B25001_001E) for querying with other census tools.Code samples (curl / TypeScript / one-click client install), schemas, and the live playground are on the pack page:
https://pipeworx.io/packs/census/
Pipeworx is an open MCP gateway connecting AI agents to live data. pipeworx.io