Tigerweb

MCP server for accessing US Census Bureau TIGERweb geographic boundary data. Returns GeoJSON for states, counties, census tracts, places, ZCTAs, and congressional districts.

Installation

npm install
npm run build

Configuration

Add to your Claude settings (.claude/settings.local.json or project settings):

{
  "mcpServers": {
    "tigerweb": {
      "command": "node",
      "args": ["/Users/shawndrake/.claude/mcp-servers/tigerweb/dist/index.js"]
    }
  }
}

Available Tools

get_states

Get GeoJSON boundaries for US states.

• stateFips (optional): Comma-separated state FIPS codes (e.g., '12' for Florida)
• includeGeometry (optional): Whether to include coordinates (default: true)

get_counties

Get GeoJSON boundaries for US counties.

• stateFips: State FIPS code to get all counties in that state
• countyGeoid: Specific 5-digit county GEOID (e.g., '12083' for Marion County, FL)
• includeGeometry (optional): Whether to include coordinates

get_tracts

Get census tract boundaries within a county.

• countyGeoid (required): 5-digit county GEOID
• includeGeometry (optional): Whether to include coordinates

get_places

Get city/town boundaries within a state.

• stateFips (required): State FIPS code
• placeName (optional): Filter by name (partial match)
• includeGeometry (optional): Whether to include coordinates

get_zcta

Get ZIP Code Tabulation Area boundaries.

• zcta (required): Comma-separated ZCTA codes (e.g., '32601,32606')
• includeGeometry (optional): Whether to include coordinates

get_congressional_districts

Get congressional district boundaries.

• stateFips (required): State FIPS code
• district (optional): Specific district number
• includeGeometry (optional): Whether to include coordinates

list_layers

List all available geographic layer types with descriptions and examples.

FIPS Code Reference

State	FIPS
Alabama	01
California	06
Florida	12
New York	36
Texas	48

County GEOIDs are 5 digits: state FIPS (2) + county FIPS (3). Example: 12083 = Florida (12) + Marion (083).

Data Source

All data comes from the US Census Bureau's TIGERweb REST Services: https://tigerweb.geo.census.gov/arcgis/rest/services/