Is there a way to understand the state/district of a user automatically by getting their pin code? Can the app automatically calculate the approximate geographical location like state/district of the person if a person provide pincode in the app?
you need a lookup table of pincode and locations.
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Can a location sensor provide the pincode/state/district of a person automatically?
No, not automatically. The LocationSensor Documentation can usually provide some of the information required to determine an Indian pin number (provided the property description is in Google's database).
A developer might be able to code a probable pin code. He/she would use the LocationSensor.CurrentAddress and the information provided by the government at the Indian pin number link above.
Create a cross reference table to determine the pin. Accurate???? See @Kevinkun 's post.
However, I was told by one user, the CurrentAddress is structured in his country like this:
Street number and name
Town name
County name
Postcode
Country
So you might be able to capture the pin in India by parsing the LocationSensor's Current Address. 
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You can achieve it by using openstreet free api key along with html and js. But user should allow access location permission
It will give you the pincode
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