osm-search/Nominatim

Health v2 · maintenance only

Adoption not part of the score

4432 stars · 855 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Nominatim is an open-source geocoding engine that searches OpenStreetMap data by name and address and performs reverse geocoding from coordinates. It can be self-hosted as a web service with a REST API or used as a Python library, and powers the search box on openstreetmap.org.

Use cases

• geocode free-form addresses to coordinates
• reverse geocode lat/lon to nearest address
• self-host a geocoding API for my app
• batch geocode a list of addresses with structured queries
• search places by name or type like cafes and hotels
• look up address details for OSM object IDs

When to choose

• you need geocoding without per-query commercial API costs
• you want full control over data, privacy, and update cadence
• you need offline or region-limited geocoding on your own server
• you need high query volumes at scale

When to avoid

• you only need occasional geocoding and can use the free public API
• you cannot run PostgreSQL/PostGIS or provision significant disk and RAM
• you need commercial-grade geocoding with support and SLAs
• you need non-OSM data sources like proprietary address datasets

Facets

service · maturity stable

search-engine geospatial http-server api-framework self-hosted self-hosted python geocoding reverse-geocoding openstreetmap postgis address-search maps search geospatial linux docker web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="osm-search/Nominatim")