• DATA
  • VALIDATION
  • FORMAT
  • HUMAN

How to find postal codes by city with your AI

Connect Zippopotam.us to your AI client once. After that, you can just ask for location data in plain English.

Ask AI about this page

Short answer

How can I get all postal codes for a city?

Tell your AI the city and state you're looking for. It will use Zippopotam.us to fetch the full list of valid postal codes for that area. You'll get a clean list of codes without having to search through a database manually.

The results

What you get

The AI handles the data retrieval so you don't have to.

DATA

Complete postal code lists

The AI pulls every valid code for the city you named. You get a clean set of numbers ready for your project.

VALIDATION

Verified location data

Because the AI uses Zippopotam.us, the codes are pulled directly from a dedicated postal database. This ensures the codes actually match the city and state provided.

FORMAT

Ready to use lists

The AI organizes the results into a format you actually need. You can ask it to present the codes as a list, a comma-separated string, or a table.

HUMAN

Manual verification

You remain in control of the final data. You decide which codes are relevant to your specific task or if you need to cross-reference them with other sources.

The workflow

What your AI does when the request arrives.

The AI acts as a bridge between your natural language and the postal database.

  1. Parse the request

    Your AI identifies the specific city and state mentioned in your prompt.

    lookup_nearby_city

  2. Query the database

    The AI calls the Zippopotam.us tool to find all matching postal codes for that location.

    lookup_nearby_city

  3. Filter results

    The AI checks the returned data to ensure every code belongs to the requested city.

    lookup_nearby_city

  4. Deliver the list

    The AI presents the final list of postal codes in the format you requested.

    lookup_nearby_city

Try it

Copy these to start.

Use these prompts to get moving immediately.

Starting points

Swap out the city and state names with the ones you actually need.

Zippopotam.us Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_m2AdUuOmpmUFiAskGVSXovo0Bhd6hoPtBBaCSGZc/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — Zippopotam.us capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "zippopotamus-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_m2AdUuOmpmUFiAskGVSXovo0Bhd6hoPtBBaCSGZc/mcp"
    }
  }
}
Copy into chat04

  • Find all the postal codes for Chicago, Illinois.

  • Give me a list of zip codes for Miami, Florida.

  • What are the postal codes for Seattle, Washington? Put them in a table.

  • List the zip codes for Austin, Texas, separated by commas.

  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Start here

Connect Zippopotam.us once, then ask.

Click the link to connect the MCP to your client. Your credentials stay encrypted, and you can start asking questions right away.

Connect Zippopotam.us to your AI

FAQ

How this task behaves

  • 01

    Can the AI find postal codes for any city in the world?

    No. The AI is limited to the data provided by the Zippopotam.us tool.

  • 02

    Can the AI update or change postal codes in the database?

    No. The AI can only read and retrieve existing data from the tool.

  • 03

    Does the AI provide street addresses too?

    No. This specific task is designed to find postal codes associated with a city and state.

  • 04

    Can I ask the AI to save these codes to a file?

    The AI can generate the text for a file, but you must handle the actual saving or file creation in your local environment.

  • 05

    Will the AI tell me if a city doesn't exist?

    Yes. If the tool cannot find a match for the city and state you provided, the AI will tell you that no codes were found.

  • More questions about Zippopotam.us? The Connector page answers them. See everything the Zippopotam.us Connector can do

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