Nominatim

API

Open-source geocoder for OpenStreetMap data

Price: Free, open source
Access: None, send a User-Agent

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Repo

About

Nominatim is the open-source geocoder behind OpenStreetMap search. It turns addresses and place names into coordinates and back. The public server is free but allows at most 1 request per second, so heavy users run their own instance.

What you can do with it

Turn an address or place name into coordinates
Reverse geocode coordinates to the nearest address
Self-host a geocoder on your own OpenStreetMap import

Get started

Send a User-Agent that identifies your app
Stay under 1 request per second on the public server

Example

curl -H "User-Agent: my-app/1.0 (you@yourdomain.com)" \
  "https://nominatim.openstreetmap.org/search?q=Unter%20den%20Linden%201%20Berlin&format=jsonv2&limit=1"

Details

Hosting: Hosted service, Self-hosted
Available in: Worldwide
MCP server: None