How do you do a zipcode?

Answer 1

Here's a free web site for coverting zipcodes to coordinates:

http://www.gpsvisualizer.com/geocoding.html

Simple enter the zipcode as the address.

The coordinates will be given in two different formats.

(There are other websites to convert between other formats.)

Answer 2

You can't - they are different things. There are no zip codes in the UK. Equally there are no post codes in the USA.