I was filling a form online nd I came across d Zip postal code field, wasn't sure wat to put there so I google naija zip/postal code... for those of us dat had bn confused over this ish here is wat I found out

ZIP (Zone Improvement Plan) codes apply ONLY to the United States . The US does not regard postal codes from other countries as “ZIP” codes. In all other countries, postal codes are used. However, ZIP codes in the US are used for the same purposes for which other countries use postal codes for mailing purposes. So, ZIP codes are to the US while postal
codes are to other countries including

Nigeria's ZIP / POSTAL code is NOT +234 for all cities and states as most people think- Rather +234 is only the International Dialing Code for Nigerian phone numbers.. example +23470********

Postal codes in Nigeria are numeric, consisting of six digits. NIPOST , the Nigerian Postal Service, divides the country into nine regions, which make up the first digit of the code. The second and third digits combined with the first, are the dispatch district for outgoing sorting. The last three digits are for delivery.
The main postal head office in each region will have a postal code ending in 0001, so Garki Main HO in Abuja has the postal code 970001, Ikeja HO in Lagos has 100001, Lokoja in Kogi has 270001 and Port Harcourt has 500001. The lowest postcode is 100001 and the
highest is 930001.

The Nigerian Postal Services still works despite
internet / email and the other Big names in the
Business (DHL, UPS, FEDEX) taking over delivery of
letters and packages faster. They NPS still offer P.O
Box address amongst other services for individuals
and corporations.