I had to look for this data today and it wasn't very easy. I want to share with you my findings:

Google Search Engine URL

Country Served

International Country Code

http://www.Google.com

USA

US

http://www.google.co.jp

Japan

JP

http://www.google.co.uk

United Kingdom

UK

http://www.google.es

Spain

ES

http://www.google.ca

Canada

CA

http://www.google.de

Deutschland

DE

http://www.google.it

Italia

IT

http://www.google.fr

France

FR

http://www.google.com.au

Australia

AU

http://www.google.com.tw

Taiwan

TW

http://www.google.nl

Nederland

NL

http://www.google.com.br

Brasil

BR

http://www.google.com.tr

Turkey

TR

http://www.google.be

Belgium

BE

http://www.google.com.gr

Greece

GR

http://www.google.co.in

India

IN

http://www.google.com.mx

Mexico

MX

http://www.google.dk

Denmark

DK

http://www.google.com.ar

Argentina

AR

http://www.google.ch

Switzerland

CH

http://www.google.cl

Chile

CL

http://www.google.at

Austria

AT

http://www.google.co.kr

Korea

KR

http://www.google.ie

Ireland

IE

http://www.google.com.co

Colombia

CO

http://www.google.pl

Poland

PL

http://www.google.pt

Portugal

PT

http://www.google.com.pk

Pakistan

PK

 

Ideal for google scraping tools and keyword rankings. We will use it for our seo app irank.