The administrative boundary of McHenry County, a county in Illinois, the United States, covering 1,582.6 km². Get its polygon in one call, as GeoJSON, KML, WKT, GML or SVG.
About 316,000 people live in McHenry County. Its 1,583 km² are 1.1% of Illinois.
Copy-paste calls for r1558785. One unit each with a free key; the low-detail polygon also works without one.
curl "https://geocodeai.dev/v1/boundaries/r1558785?detail=medium" \
-H "Authorization: Bearer $GEOCODE_API_KEY"curl -X POST "https://geocodeai.dev/v1/boundaries/r1558785/contains" \
-H "Authorization: Bearer $GEOCODE_API_KEY" \
-H "Content-Type: application/json" \
-d '{"points":[[-88.4523,42.2861]]}'Every format and detail level below needs a free API key. Get a free API key
https://geocodeai.dev/v1/boundaries/r1558785.geojson?detail=mediumhttps://geocodeai.dev/v1/boundaries/r1558785.kml?detail=mediumhttps://geocodeai.dev/v1/boundaries/r1558785.wkt?detail=mediumhttps://geocodeai.dev/v1/boundaries/r1558785.svg?detail=mediumhttps://geocodeai.dev/v1/boundaries/r1558785.gml?detail=mediumEach export redirects to a permanent CDN file. Add ?detail=low|medium|high|full. Formats
Get the McHenry County boundary (r1558785) from Geocode AI as GeoJSON and tell me which of my locations are inside it.With the MCP server or the Claude and Codex plugins.
Boundary data © OpenStreetMap contributors, ODbL. Need several boundaries as one zone, or a zone written in words?