# osm-search/Nominatim

Open Source search based on OpenStreetMap data

Repository: https://github.com/osm-search/Nominatim
Canonical: https://ross.abutalabs.com/products/nominatim
Homepage: https://nominatim.org
Language: Python
License: GPL-3.0
License Family: copyleft
Topics: openstreetmap, geocoding, osm
Last push: 2026-08-22T19:58:19+00:00

## Health v2 (maintenance only)
Score: 84/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 56, longevity 100
- inputs: {"age_days": 5296, "days_push": 11, "days_rel": 136, "gap_med": 100.0, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4432, forks 855 (observed 2026-08-28T04:08:49.147675+00:00)

## What it is
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
- artifact type: service
- maturity: stable
- function: search-engine, geospatial, http-server, api-framework
- domain: self-hosted
- platform: self-hosted, python
- tags: geocoding, reverse-geocoding, openstreetmap, postgis, address-search, maps, search, geospatial, linux, docker, web-server

## Member repositories
- osm-search/Nominatim (main) score 84

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:49.147675+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:20:54.127943+00:00, confidence not recorded.
  - readme: https://github.com/osm-search/Nominatim (fetched 2026-08-28T04:08:49.147675+00:00, sha 318a5ea5364b)
  - homepage: https://nominatim.org (fetched 2026-08-29T09:08:20.785732+00:00, sha dbc7b4a2f73e)
  - site_page: https://nominatim.org/release-docs/latest (fetched 2026-08-29T09:08:20.794805+00:00, sha e21fb18bf65d)
  - site_page: https://nominatim.org/release-docs/develop/api/Overview (fetched 2026-08-29T09:08:20.796900+00:00, sha 150738f5516a)
  - site_page: https://nominatim.org/release-docs/latest/admin/Installation (fetched 2026-08-29T09:08:20.798844+00:00, sha ea8fd83113cc)
- Data as of 2026-08-30T08:39:29.467469+00:00.