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Can Claude find the census tract for an address?

Not exactly on its own. Claude can explain what a census tract is, but tract lines follow streets, rivers and rail lines, so a guess from the city or ZIP code is often wrong, and the two sides of one street can be in different tracts. With web search on, Claude may find the Census Geocoder page, but a search result does not run the lookup for your address. Connect the free Address to Census Tract server and Claude asks the US Census Bureau Geocoder directly and returns the tract number, the 11-digit GEOID, block group and districts, the same every time.

Connect free, no token Address to census tract MCP server

What Claude does alone, and what needs the server

Claude on its own

  • Explains tracts, block groups and how a GEOID is built from FIPS codes.
  • Splits a GEOID you paste into its parts.

With the Address to Census Tract server

  • The official tract and GEOID for a US street address or a latitude and longitude.
  • Block group, block, county FIPS, place and congressional and state legislative districts.
  • A choice of today's geographies, the 2020 Census or an ACS release.

A real call to the live server

We sent this to the hosted server on 2026-11-05. The answer below is the server's own text, not a mock-up. Live values will differ when you ask.

You ask

What census tract is 1600 Pennsylvania Ave NW, Washington, DC 20500 in?

Tool call

get_census_tract_for_address {"address":"1600 Pennsylvania Ave NW, Washington, DC 20500"}

Server answer

1600 PENNSYLVANIA AVE NW, WASHINGTON, DC, 20500 is in Census Tract 9800 (GEOID 11001980000), block group 1 (110019800001), District of Columbia, District of Columbia. Delegate District (at Large) (120th Congressional Districts). Census vintage Current_Current.

You ask

Which census tract and block group is the point 41.8827, -87.6237 in?

Tool call

get_census_tract_for_coordinates {"latitude":41.8827,"longitude":-87.6237}

Server answer

The point 41.8827, -87.6237 is in Census Tract 3201.02 (GEOID 17031320102), block group 2 (170313201022), Cook County, Illinois. Congressional District 7 (120th Congressional Districts). Census vintage Current_Current.

Connect it in 1 minute

One URL, no token, no account. In Claude.ai or Claude Desktop open Settings, then Connectors, then Add custom connector, and paste the URL.

Connector URL

https://address-to-census-tract-mcp.lipmichal.workers.dev/mcp

Claude Code

claude mcp add --transport http address-to-census-tract https://address-to-census-tract-mcp.lipmichal.workers.dev/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "address-to-census-tract": {
      "url": "https://address-to-census-tract-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

VS Code (.vscode/mcp.json)

{
  "servers": {
    "address-to-census-tract": {
      "type": "http",
      "url": "https://address-to-census-tract-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

All 3 tools, sources and more prompts are on the Address to census tract MCP server page.

Questions

Can Claude find the census tract for an address?
Not exactly on its own. Claude can explain what a census tract is, but tract lines follow streets, rivers and rail lines, so a guess from the city or ZIP code is often wrong, and the two sides of one street can be in different tracts. With web search on, Claude may find the Census Geocoder page, but a search result does not run the lookup for your address. Connect the free Address to Census Tract server and Claude asks the US Census Bureau Geocoder directly and returns the tract number, the 11-digit GEOID, block group and districts, the same every time.
Does it check opportunity zone or LIHTC eligibility?
Not directly. It returns the tract GEOID that those lists are keyed on, so you or Claude can check the GEOID against the official list.
Which census vintage does it use?
Today's geographies by default. You can ask for the 2020 Census geographies or a matching ACS release instead.
Is the server free?
Yes. The Address to Census Tract server is free at its hosted URL with no token, key or account. The source is open on GitHub.

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