v2.1.0 — All States Verified

Every course state verified against Nominatim reverse geocoding.
1,710 wrong states corrected.
500-course random verification: 0.0% error rate.
IL sample: 100 courses verified, 0 outside bounds.
Export validation: PASS.

v2.0.0 — Clean Data, Fully Open

All data is now open. No premium tier. No GolfAGI.

Changes from v1.0.0

• 15,667 courses (was 16,908 — duplicates removed, bad data cleaned)
• 1,806 wrong state assignments corrected
• 1,173 duplicate courses merged and removed
• 7,173 bad tee records (impossible slope/rating/yardage) nulled
• 77 par-total mismatches fixed against hole data
• All GolfPass and GolfAGI references removed

All fields open

The API now serves everything: tees, climate, nearby POIs, holes with per-tee yardages. No restrictions.

• API: https://api.opengolfapi.org
• MCP: npm install -g @opengolfapi/mcp-server (v2.0.0)
• Donate: https://opencollective.com/opengolfapi

License

ODbL 1.0. Attribution: Contains data from OpenGolfAPI (opengolfapi.org).

v1.0.0 — Initial Release

First public release of the OpenGolfAPI dataset.

What's included

• 16,908 US golf courses
• Name, location (lat/lng + city + address), course type, holes, par, total yardage, year built, architect
• Per-hole par + handicap index where available (15,211 courses, 90%)
• Phone, website where available
• OSM id for cross-linking
• updated_at for freshness tracking

Formats

• GeoJSON (raw + gzipped)
• CSV (raw + gzipped)
• NDJSON (raw + gzipped)

License

ODbL 1.0. Attribution: Contains data from OpenGolfAPI (opengolfapi.org), available under ODbL.

Verify

Use SHA256SUMS to verify integrity. All sources documented in the README.

Known limitations

• 382 courses excluded for bad upstream coordinates. Tracked for v1.1.
• Architect and total yardage have low coverage (~3%). Community contributions welcome.