io.github.mrfentmen/zip-codes-mcp is an MCP server that look up US postal codes, cities, and states from Zippopotam. No key required. Its tool list has not been published yet over stdio, requires no API key, and scores 37/100 on MCPpedia's security, maintenance and efficiency rubric.
Step 1
Install in your client
Config is the same across clients - only the file and path differ.
CD
Supported in Claude Desktopstdio · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io-github-mrfentmen-zip-codes-mcp": {
"args": [
"-y",
"zip-codes-mcp"
],
"command": "npx"
}
}
}Are you the author?
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What io.github.mrfentmen/zip-codes-mcp does
Look up US postal codes, cities, and states from Zippopotam. No key required.
Test This Server
Run this in your terminal to verify the server starts. Then let us know if it worked - your result helps other developers.
npx -y 'zip-codes-mcp' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Scored, not listed
Why this score
Five weighted categories - click any category to see the underlying evidence.
Score breakdown
37/100across 5 weighted dimensions
0255075100
20
10
−63
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.devNo known CVEs.
Checked zip-codes-mcp against OSV.dev.
Community
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Frequently Asked Questions
- Is io.github.mrfentmen/zip-codes-mcp safe to use?
- io.github.mrfentmen/zip-codes-mcp has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment.
- How do I install io.github.mrfentmen/zip-codes-mcp?
- io.github.mrfentmen/zip-codes-mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What AI clients work with io.github.mrfentmen/zip-codes-mcp?
- io.github.mrfentmen/zip-codes-mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio transport.
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Community
Discussion
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