It's not possible with Magento Code you need to call Custom Google API
Here is the Example with the Google Map API
How to get Google API Key?
You need to call the API for getting Region Name by Zip-Code
API : https://maps.googleapis.com/maps/api/geocode/json?address=560100&sensor=true&key=AIzaSyCQ688uhIYTXi4kphAvgTq0Lf25dg62198
Response:
{
"results" : [
{
"address_components" : [
{
"long_name" : "560100",
"short_name" : "560100",
"types" : [ "postal_code" ]
},
{
"long_name" : "Bengaluru",
"short_name" : "Bengaluru",
"types" : [ "locality", "political" ]
},
{
"long_name" : "Bengaluru Urban",
"short_name" : "Bengaluru Urban",
"types" : [ "administrative_area_level_3", "political" ]
},
{
"long_name" : "Bangalore Division",
"short_name" : "Bangalore Division",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "Karnataka",
"short_name" : "KA",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "India",
"short_name" : "IN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "Bengaluru, Karnataka 560100, India",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 12.8751739,
"lng" : 77.71305129999999
},
"southwest" : {
"lat" : 12.8193509,
"lng" : 77.6091
}
},
"location" : {
"lat" : 12.8498481,
"lng" : 77.6544856
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 12.8751739,
"lng" : 77.71305129999999
},
"southwest" : {
"lat" : 12.8193509,
"lng" : 77.6091
}
}
},
"place_id" : "ChIJCa-XPptsrjsRL5utZGjUjOk",
"postcode_localities" : [
"Andapura",
"Basapura",
"Bengaluru",
"Beratena Agrahara",
"Bettadasanapura",
"Bhovi Palya",
"Bommasandra",
"Bommasandra Industrial Area",
"Chikkathoguru",
"Chinthalamadivala",
"Daadys Gaarden Layout",
"Doddanagamangala Village",
"Doddathoguru",
"Electronic City",
"Gottamaranahalli",
"Gulimangala",
"Hulimangala",
"LHR layout",
"Maragondanahalli",
"Mylasandra",
"Podu",
"RS Gardens",
"Rayasandra",
"S.Bingipura",
"Singena Agrahara",
"Thirupalya",
"Vaddara Palya",
"Vidyanagar",
"Vittasandra"
],
"types" : [ "postal_code" ]
}
],
"status" : "OK"
}
Note : You need to change key with your API key.