PostalDataPI MCP Server

MCP (Model Context Protocol) server for PostalDataPI — lets AI agents look up, validate, and search postal codes across 240+ countries with rich metadata: timezone, administrative regions, elevation, and coordinates.

Tools

Tool	Description
lookup_postal_code	Get city, state/region, and abbreviation for a postal code (US ZIP, UK postcode, German PLZ, etc.)
validate_postal_code	Check if a postal code exists in a country
search_by_city	Find all postal codes for a city
get_postal_code_metadata	Full metadata: coordinates, admin hierarchy, timezone, elevation, 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

240+ countries and territories including US, UK, Canada, Germany, France, Japan, Australia, Brazil, India, and many more. See the full list at postaldatapi.com/countries.

Rich Metadata

Beyond basic lookups, the get_postal_code_metadata tool returns up to 18 fields per postal code including:

• Coordinates (latitude, longitude)
• Timezone (e.g., America/Mexico_City, Europe/Berlin)
• Administrative hierarchy (state/province, county, municipality)
• Elevation (meters above sea level)
• Place name and country information

Example response for Mexico City 06000:

{
  "postalCode": "06000",
  "country": "MX",
  "placeName": "Centro",
  "latitude": 19.4364,
  "longitude": -99.1553,
  "timezone": "America/Mexico_City",
  "adminLevel1": "Ciudad de México",
  "adminLevel2": "Cuauhtémoc",
  "elevation": 2239
}

Links

• PostalDataPI
• API Reference
• Documentation
• Python SDK
• Node.js SDK