CountryCode.org is your complete guide to make a call from anywhere in the world, to anywhere in the world. This page details New Caledonia phone code.The New Caledonia country code 687 will allow you to call New Caledonia from another country. New Caledonia telephone code 687 is dialed after the IDD.
Postal codes were first introduced in Germany in 1941, followed by Argentina in 1958, United Kingdom in 1959 and United States in 1963. Now there are more than 117 countries in the world having their own postal code systems. The purpose of postal codes is to sort mail more efficiently, reliably and automatically. As you said postal code, not zip code, I assume you are referring to Mission Bay in Auckland, New Zealand. This area has more than one postal code for private delivery, but post boxes in this area.
New Caledonia international dialing 687 is followed by an area code.The New Caledonia area code table below shows the various city codes for New Caledonia. New Caledonia country codes are followed by these area codes. With the complete New Caledonia dialing code, you can make your international call.