Discover the geolocation data for post code 0821 exclusively in Australia using Google Maps Geocoding

I'm having trouble geocoding the Australian postcode 0821. It doesn't seem to reliably identify this postcode as being located within the Northern Territory, unlike 0820 and 0822 which work fine.

Here's an example of what I'm doing:

      var gm = google.maps;
      var gc = new gm.Geocoder();
      var grq:google.maps.GeocoderRequest = {
        address:s, region:"au"
      };
      var m = /[0-9]{4}/.exec(s);
      if(m && m.length == 1)
        grq.componentRestrictions = {
          country:'au'/*, postalCode:m[1]*/
        };
      gc.geocode(grq,(results, status)=>{
        if(status == gm.GeocoderStatus.OK) {
          var latLng = results[0].geometry.location;
          $.ajax({
            url:`${apiUrl}near/${latLng.lat()},${latLng.lng()}`,
            success: (response)=>this.parseResult(response,latLng)});
        } else {
          this.search.searchEnded();
          console.warn("Gecode Failed",results,status);
          alert('Unable to find location, try entering more specific search');
        }

This example also seems to show similar problems. Instead of identifying 0821 in Australia, it shows it in Buenos Aires when searching 'Australia 0821' or '0821 Australia'. However, searching 'Australia 0822' works fine.

I've even tried using postal code restrictions, but that only made things worse.

How can I reliably geocode a postcode?

javascriptgoogle-mapstypescriptgoogle-geocoder

Answer №1

let locationFinder = new google.maps.Geocoder();
locationFinder.findLocation({
  componentRestrictions: {
    country: 'US',
    zipCode: zipcode
  }
}

Answer №2

If you're focusing on Australia, I recommend checking out the AusPost's postcode api. Alternatively, there are several other APIs available such as which I find to be quite good.

It's possible that this issue is simply a bug in Google's system. I would suggest reporting it in their product forum if all other post codes are functioning correctly.

Answer №3

Encountering the same issue with two different AU postal codes (5000, 0800) today led me to implement a fail-over strategy of making two separate calls rather than one.

When attempting to retrieve data using singular methods, I found that postal code 5000 would yield results while 0800 did not, and vice versa. To address this challenge, I devised the following solution:

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>

<script>
  var region = 'AU';
  var zip = ['5000', '0800'];
  
  geocoder = new google.maps.Geocoder();

  for(var i=0; i < zip.length; i++) {
    var address = zip[i] + ',' + region;
    
    geocoder.geocode({
      'address': address,
      'componentRestrictions': {
        'country': region,
        'postalCode': zip[i]
      }
    }, function(results, status) {
      //check status
      if (status == google.maps.GeocoderStatus.OK) {
        //do work here 
      } else {
        console.log('STATUS - ', status);
        console.log('Trying with only component restrictions.');
        
        geocoder.geocode({
          'componentRestrictions': {
            'country': region,
            'postalCode': zip[i]
          }
        }, function(results, status) {
          if (status == google.maps.GeocoderStatus.OK) {
            console.log("Success! - ", status);
          } else {
            console.log("noResults - ", status);
          }
        });
      }
    });
  }
</script>

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