Region code of each countery is decided as the following list.
(*) is area name.

=================
  Region Code 1
=================
Canada
United States
American Samoa (*)
Bermuda (*)
Johnston Island (*)
Midway Islands (*)
Puerto Rico (*)
St. Pierre and Miquelon (*)
United States Virgin (*)
Wake Island (*)

=================
  Region Code 2
=================
Albania
Andorra
Austria
Bahrain
Belguim
Bosnia and Herzegovina
Bulgaria
Croatia
Cyprus
Czech
Denmark
Egypt
Finland
France
Germany
Greece
Hungary
Iceland
Iran
Iraq
Ireland
Israel
Italy
Japan
Jordan
Kuwait
Lebanon
Lesotho
Liechtenstein
Luxembourg
Macedonia
Malta
Monaco
Netherlands
Norway
Oman
Poland
Portugal
Qatar
Romania
San Marino
Saudi Arabia
Slovakia
Slovenia
South Africa
Spain
Swaziland
Sweden
Switzerland
Syrian Arab Republic
Turkey
United Arab Emirates
United Kingdom
Vatican City State
Yemen
Yugoslavia
Channel Islands (*)
Faeroe Islands (*)
Gibraltar (*)
Greenland (*)
Isle of Man (*)
Svalbard and Jan Mayen Islands (*)

=================
  Region Code 3
=================
Brunei Darussalam
Cambodia
Indonesia
Korea
Laos
Malaysia
Myanmar
Philippines
Singapore
Thailand
Viet Nam
East Timor (*)
Hong Kong (*)
Macau (*)
Taiwan (*)

=================
  Region Code 4
=================
Antigua and Barbuda
Argentina
Australia
Bahamas
Barbados
Belize
Bolivia
Brazil
Chile
Colombia
Costa Rica
Cuba
Dominica
Dominican Republic
Ecuador
El Salvador
Fiji
Grenada
Guatemala
Guyana
Haiti
Honduras
Jamaica
Kiribati
Marshall Islands
Mexico
Micronesia
Nauru
New Zealand
Nicaragua
Palau
Panama
Papua New Guinea
Paraguay
Peru
Saint Christpher and Navis
Saint Lucia
Saint Vincent and the Grenadines
Samoa
Solomon Islands
Suriname
Tonga
Trinidad Tobago
Tuvalu
Uruguay
Vanuatu
Venezuela
Anguilla (*)
Aruba (*)
British Virgin Islands (*)
Caymon Islands (*)
Christmas Island (*)
Cocos Islands (*)
Cook Islands (*)
Falkland Islands (*)
French Polynesia (*)
Guadeloupe (*)
Guam (*)
Martinique (*)
Montserrat (*)
Netherlands Antilles (*)
New Caledonia (*)
Niue (*)
Norfork Island (*)
Northern Mariana Islands (*)
Pitcairn (*)
Tokelau (*)
Turks and Caicos Islands (*)
Wallis and Funtuna Islands (*)

=================
  Region Code 5
=================
Afghanistan
Algeria
Angola
Armenia
Azerbaijan
Bangladesh
Belarus
Benin
Bhutan
Botswana
Burkina Faso
Burundi
Cameroon
Cape Verde
Central Africa
Chad
Comoros
Congo
Cote Divoire
Djibouti
Equatorial Guinea
Eritrea
Estonia
Ethiopia
Gabon
Gambia
Georgia
Ghana
Guinea
Guinea-Bissau
India
Kazakhustan
Kenya
Kyrgyz Republic
Latvia
Liberia
Libya
Lithuania
Madagascar
Malawi
Maldives
Mali
Mauritania
Mauritius
Moldova
Mongolia
Morocco
Mozambique
Namibia
Nepal
Niger
Nigeria
North Korea
Pakistan
Russia
Rwanda
Sao Tome and Principe
Senegal
Seychelles
Sierra Leone
Somalia
Sri Lanka
Sudan
Tadzhikistan
Tanzania
Togo
Tunisia
Turkmenistan
Uganda
Ukraine
Uzbekistan
Zarie
Zambia
Zimbabwe
British Indian Territory (*)
Jammu and Kashmir (*)
Mayotte (*)
Reunion (*)
St. Helena ex. dep. (*)
Western Sahara (*)

=================
  Region Code 6
=================

China