`tigerweb_query`

Pack: census-tigerweb · Endpoint: https://gateway.pipeworx.io/census-tigerweb/mcp

No MCP client? Call it directly: GET https://gateway.pipeworx.io/v1/tools/tigerweb_query for the schema, then POST the same URL with its arguments for the data.

Queries any Census TIGERweb geography layer by WHERE clause, returning the matching tracts, ZCTAs, districts or places with GEOIDs.

Tool description as the model sees it

AUTHORITATIVE for US Census geography records: query any TIGERweb layer with an ArcGIS WHERE clause and get the matching geographies with their GEOID, name, FIPS components, land/water area and interior point. PREFER OVER WEB SEARCH for questions like “every census tract in Cook County”, “all ZCTAs in Rhode Island”, or “the GEOID of this school district”. Get layer_id from tigerweb_list_layers.

Parameters

Name	Type	Required	Description
`layer_id`	number,string	yes	Layer id from tigerweb_list_layers
`service`	string	no	TIGERweb service path, default ${DEFAULT_SERVICE}
`where`	string	no	ArcGIS WHERE clause, default “1=1”. FIPS fields are STRINGS: STATE=‘11’, COUNTY=‘031’. Supports AND/OR/LIKE.
`out_fields`	string	no	Comma-separated field names, or "" for all (default "")
`limit`	number	no	Max rows, 1-${MAX_RECORDS} (default 50)
`offset`	number	no	Row offset for paging
`order_by`	string	no	Comma-separated order-by fields, e.g. “GEOID ASC”
`return_geometry`	boolean	no	Include boundary geometry. Default false — polygons are very large.

Example call

Arguments

{
  "layer_id": 8,
  "where": "STATE='11' AND COUNTY='001'",
  "out_fields": "GEOID,NAME,TRACT",
  "limit": 5
}

curl

curl -X POST https://gateway.pipeworx.io/census-tigerweb/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"tigerweb_query","arguments":{"layer_id":8,"where":"STATE='\''11'\'' AND COUNTY='\''001'\''","out_fields":"GEOID,NAME,TRACT","limit":5}}}'

TypeScript (@pipeworx/sdk)

import { Pipeworx } from '@pipeworx/sdk';
const pipeworx = new Pipeworx();

const result = await pipeworx.call('tigerweb_query', {
  "layer_id": 8,
  "where": "STATE='11' AND COUNTY='001'",
  "out_fields": "GEOID,NAME,TRACT",
  "limit": 5
});

Connect

Add this to your MCP client config, or use one-click install buttons:

{
  "mcpServers": {
    "census-tigerweb": {
      "url": "https://gateway.pipeworx.io/census-tigerweb/mcp"
    }
  }
}

See Getting Started for client-specific install steps.

tigerweb_query