It is not possible to answer this question in a sensible way since you have not bothered to mention which country you are referring to.
The postcode of hyderabad starts with 5000XX
melbourne
twelve
Nsw
28326
number
Yes, you typically need a postcode even if you have a PO Box number. The postcode helps postal services efficiently route and deliver mail to the correct area. Including both the PO Box number and the relevant postcode ensures that your mail reaches you without delays.
You need to be more specific ! There are hundreds of postcodes for the city of Dagenham. Each postcode only covers a small number of buildings.
there is no postcode for Kerry
Oman is a country, there is no postcode for a country. but within Oman, there are many post codes, typically a three digit number, e.g. 110 or 131 ... etc.
A six letter word that starts with U is upward.
postcode ankara