Namibia (updated 1 jan 2000)
NamPost
Good site. Subscribe, order, and see ALL images of Namibian stamps since 1990. You can subscribe to a mailing list.

Nauru (updated 2 Feb 2008)
Post Office

Nepal (updated 23 Nov 2006)
Postal Service

The Netherlands (updated 14 Apr 2006)
Tpg Post
A new site is online but the english version is no more available! They told me: "At this time it is not known if the site will also be in the English language". So, unless you speak dutch, now it's impossible for an international customer to buy something on www.collectclub.nl.
The checkout of any online order now is available in english. But all the shop is still in dutch language only.

Netherlands Antilles (updated 14 Apr 2006)
Nieuwe Post Nederlandse Antillen NV (NPNA)
A new site is finally online and running!! Online shop added.
You can also order year packs from post of Netherlands: http://www.collectclub.nl/CollectClub/product_category.asp?
Section=2&catalog_name=Main&category_name=Prod_Foreign_Stamps&Page=1

Nevis (updated 24 Sep 2006)
Nevis Post
This new link is still not the official site of post office but it has updated info, including stock list of 1999 issues and 2000 stamp programme.

New Caledonia (updated 19 Apr 2002)
OPT de Nouvelle-Calédonie
A very good website. You can see current year stamp programme , images of every stamp currently on sale and you can order them (only payment is not possible online). Stamps of New Caledonia are also sold by french posts.

New Zealand (updated 19 Sep 2009)
New Zealand Post
Site of NZ Stamp Centre. Latest issues, full online shop, philatelic bulletins online; join mailing list. NZ Post issues also the stamps of Ross Dependency. Nz Post is also selling NZ coins and the stamps of Niue, Vanuatu, Hong Kong, United Nations, Pitcairn, Samoan, Malta, Fiji, Tonga and Niuafo'uo.

Nicaragua (updated 16 Sep 2004)
Correos de Nicaragua
Images of every postage stamp issued since 1981. Site has been updated to reflect all issues up through 2004. Other interesting info.

Niger (updated 23 feb 2006)
PTT

Nigeria (updated 30 Jul 2007)
NIPOST - Nigeria Post

Niuafo'ou (updated 6 Feb 2000)
Post Office
Niuafo'ou is part of Tonga but it's issuing its own stamps since 1983. You can also buy these stamps from NZ post.

Niue (updated 18 Sep 2009)
Post Office

Norfolk Island (updated 29 Mar 2003)
Norfolk Island Postal Service
Info on 1998 issues to date plus images. A form is available to contact them for additional information. This site is again updated. They also have a page at Yahoo clubs with a photo album available only if you join the club: http://clubs.yahoo.com/clubs/norfolkislandstamps .
You can ask for bulletins and order forms by e-mail. Philatelic Bureau accepts any major currency in cash in an envelope, but charge A$8.00 for any currency other than A$; they charge A$0.75 every time for P/H.

Norway (updated 30 Nov 2008)
Norway Post
An advanced online shop has been added and now it's possible to buy the whole offer of the stamp bureau. Great!
Subscribe stamps online, view stamp programme, online ordering of year products only, images of latest issues. English. You can also order free brochures.