PostalDataPI MCP Server

Global postal code lookups, validation, and city search for 70+ countries. Sub-10ms responses.

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PostalDataPI MCP Server

MCP (Model Context Protocol) server for PostalDataPI — lets AI agents look up, validate, and search postal codes across 70+ countries.

Tools

ToolDescription
lookup_postal_codeGet city and state for a postal code (US ZIP, UK postcode, German PLZ, etc.)
validate_postal_codeCheck if a postal code exists in a country
search_by_cityFind all postal codes for a city
get_postal_code_metadataFull metadata: coordinates, county, timezone, and more

Setup

1. Get an API Key

Sign up at postaldatapi.com/register — 1,000 free queries, no credit card required.

2. Install

pip install postaldatapi-mcp

3. Configure with Claude Code

claude mcp add --transport stdio postaldatapi -- \
  env POSTALDATAPI_KEY=your_api_key_here postaldatapi-mcp

4. Configure with Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "postaldatapi": {
      "command": "postaldatapi-mcp",
      "env": {
        "POSTALDATAPI_KEY": "your_api_key_here"
      }
    }
  }
}

Usage

Once configured, ask Claude naturally:

  • "What city is ZIP code 90210?"
  • "Look up UK postcode SW1A"
  • "Is 10115 a valid German postal code?"
  • "What are the postal codes for Beverly Hills, CA?"
  • "Get the coordinates for postal code 100-0001 in Japan"

Claude will automatically use the PostalDataPI tools to answer.

Supported Countries

70+ countries including US, UK, Canada, Germany, France, Japan, Australia, and more. See the full list at postaldatapi.com/countries.

Links

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