Real Estate API Questions

What are the best APIs for nationwide parcel boundaries and polygon data?

Quick Answer

The best parcel boundary APIs deliver high-precision GeoJSON MultiPolygon coordinates, sub-10ms query times, and seamless joins to tax, ownership, and zoning attributes across 180M+ parcels.

Summary

Parcel boundary APIs provide exact geographic property perimeters. Top providers normalize county GIS shapefiles into standard WGS84 GeoJSON geometry, offer coordinate-and-radius spatial lookups, and stream vector map tiles for interactive map applications built with MapLibre, Mapbox, or Leaflet.

What to look for in a parcel boundary API

Standardized GeoJSON: Clean MultiPolygon geometries in WGS84 decimal degrees (`[longitude, latitude]`).

Attribute linkage: Instant joins between parcel geometry and assessor traits (owner of record, tax assessed value, zoning code, building footprint).

Vector tile performance: Fast vector map tile streaming for responsive client-side map rendering at scale.

Interactive mapping integration

Modern web mapping stacks (MapLibre GL JS, Mapbox GL JS) can stream parcel vector tiles directly from Realie, coloring parcels dynamically by zoning category, land use, or valuation ranges.

Frequently asked questions

What format are parcel boundaries returned in?
Boundaries are returned as standard GeoJSON MultiPolygon geometries compatible with all modern mapping and GIS libraries.
How do I query parcel boundaries near a coordinate?
Send latitude, longitude, and search radius to `/api/public/property/location` to retrieve all intersecting parcel geometries.

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