The following is a definition list of all Region codes associated with DVDs.  It also includes the countries associated with that region.

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REGION 0
Region free
Compatible with DVD players from any country

REGION 1
US, US territories and Canada-
American Samoa, Canada, Guam, Palau, Mariana Islands, Marshall Islands, Puerto Rico, Micronesia, United States, U.S. Virgin Islands

REGION 2
UK, Europe, Japan, South Africa and Middle East-
Albania, Andorra, Austria, Bahrain, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Egypt, Finland, France, Germany, Gibraltar, Greece, Greenland, Hungary, Iceland, Iran, Iraq, Ireland, Israel, Italy, Japan, Jordan, Kuwait, Lebanon, Liechtenstein, Luxembourg, Macedonia, Malta, Moldova, Monaco, Netherlands, Norway, Oman, Poland, Portugal, Qatar, Romania, San Marino, Saudi Arabia, Slovakia, Slovenia, South Africa, Spain, Sweden, Switzerland, Syria, United Arab Emirates, United Kingdom, Vatican City, Yemen, Yugoslavia

REGION 3
Southeast and East Asia-
Cambodia, Hong Kong, Indonesia, Laos, Malaysia, Myanmar, Phillipines, South Korea, Taiwan, Thailand, Vietnam

REGION 4
Australia, New Zealand, Central and South America-
Antigua, Argentina, Aruba, Australia, Bahamas, Barbados, Barbuda, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, Falkland Islands, French Guiana, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, New Guinea, New Zealand, Nicaragua, Panama, Paraguay, Peru, Suriname, Trinidad, Tobago, Uruguay

REGION 5
Former Soviet Union, Indian sub-continent, Africa, North Korea and Mongolia-
Afghanistan, Algeria, Angola, Bangladesh, Belarus, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Cape Verde, Central African Republic, Chad, Comoros, Congo, Djibouti, Equatorial Guinea, Eritrea, Estonia, Ethiopia, Gabon, Gambia, Georgia, Ghana, Guinea, Guinea-Bissau, India, Ivory Coast, Kazakhstan, Kenya, Latvia, Lesotho, Liberia, Libya, Lithuania, Madagascar, Malawi, Mali, Mauritania, Mauritius, Mongolia, Morocco, Mozambique, Namibia, Niger, Nigeria, North Korea, Pakistan, Russia, Rwanda, Sao Tome and Principe, Senegal, Seychelles, Sierra Leone, Somalia, Sri Lanka, St. Helena, Sudan, Tanzania, Togo, Tunisia, Turkmenistan, Uganda, Ukraine, Uzbekistan, Zambia, Zimbabwe

REGION 6
China-
China

REGION 7
Not used

REGION 8
International Territories (ships, planes etc)