When searching Google Maps for a city, the city's administrative boundary is displayed.

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Is there a way to get the polygon boundaries of City in a JSON format using google maps api?


You can get polygon coordenates in json for using with googlemaps using openstreetmap. Go to http://nominatim.openstreetmap.org/ search a place like "Partido de ItuzaingĂł"

click on "details"

Look for OSM ID and copy it (control+c), example: 2018776

paste the ID in http://polygons.openstreetmap.fr/index.py and download the polygon


To get polygon boundaries just add format=json to your request!

So instead of https://nominatim.openstreetmap.org/search.php?q=Warsaw+Poland&polygon_geojson=1



By adding &format=geojson you can get a valid geojson response


No, there is no way to steal Google's data. May be you could look at OpenStreetMap which is designed for people to download.

  • 1
    Have some exemple, how can extract polygons boundaries in OpenStreetMap? If I extract this, can draw the extracted polygon on google maps? – Luis Tiago Mar 4 '16 at 19:25
  • Please search this site and ask a new question if you are unable to find the answer to this – Ian Turton Mar 4 '16 at 19:52
  • 2
    Who would consider this stealing? This data is taken from the US Census. – ihodonald Jun 10 '19 at 5:17
  • 1
    then fetch it from the US census site, though I doubt they have many UK city boundaries – Ian Turton Jun 10 '19 at 7:37

I've found a work around solution for this problem.

  1. Go to www.gadm.org/country
  2. Choose your country and select Google Earth .kmz file format
  3. Choose the level you need (level 3 is the deepest with all small towns/cities)
  4. Download the file (can be large)
  5. Unzip the .kmz file (You'll find a .kml which is XML)
  6. Open it with Sublime or notepad++ (the file will probably be too large for other text editor)
  7. Search by city name and copy data below (Search can take 1 to 4 seconds with large file)

You can use lat,long data and parse it into an array. This solution is working well, but the quality of the path is sometimes rough.


As an alternative to Google Maps API, OpenStreetMap may help you to search for a city by name in this page http://nominatim.openstreetmap.org/ . Then review search results, and you can get region coordinate in GeoJSON format e.g (http://nominatim.openstreetmap.org/details.php?place_id=145126778) to get mashhad geojson coordinates in Administrative tab

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