Geopolypedia — The Open Neighborhood Boundary Encyclopedia
Geopolypedia is a free, open-source encyclopedia of neighborhood boundary polygons. Explore and download GeoJSON boundary data for neighborhoods, cities, counties, and states across the United States.
What is Geopolypedia?
Geopolypedia provides accurate, open-licensed geographic boundary data in GeoJSON format for developers, researchers, urban planners, and anyone who needs neighborhood-level geographic data. Our data comes from authoritative sources including US Census TIGER/Line shapefiles, city open data portals, and community contributions.
Features
- 8,000+ neighborhood boundary polygons across 100+ US cities
- County boundaries for all 3,200+ US counties
- State boundary polygons for all 50 states + territories
- City and town boundaries from Census TIGER/Line Places data
- Free GeoJSON downloads — no API key required
- Interactive map with search, zoom, and click-to-explore
- Data sourced from US Census Bureau, NYC Open Data, Chicago Open Data, DataSF, LA GeoHub, San Diego Open Data, and more
Available Cities
New York, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, Dallas, Austin, San Jose, San Francisco, Seattle, Denver, Boston, Portland, Detroit, Minneapolis, Atlanta, Miami, Tampa, New Orleans, Pittsburgh, Cleveland, Cincinnati, Sacramento, Oakland, Las Vegas, Salt Lake City, and many more.
API
Access our data programmatically via the Geopolypedia API:
- Search:
/api/search?q=greenpoint
- Reverse geocode:
/api/lookup?lat=32.85&lng=-117.27
- Download GeoJSON:
/api/download/san-diego.geojson
- List cities:
/api/cities
- Statistics:
/api/stats
Data Sources & Licensing
US government data (Census TIGER/Line, city open data portals) is public domain and free for commercial and non-commercial use. Country boundaries from Natural Earth (public domain). OpenStreetMap-derived data is licensed under ODbL and requires attribution.
Please enable JavaScript to use the interactive map.