Tamil is the 15th most spoken language in the world. Tamil language speakers make approximately 1% of the world population.

The following is a list of sovereign states and territories where Tamil is an official or language of government:

1. Indian States – Tamil Nadu, Puducherry and Andaman and Nicobar Islands
2. Sri Lanka
3. Singapore

Countries where Tamil is used and has cultural/educational impact but not official:

1. Malaysia
2. Mauritius
3. France Réunion – Africa
4. Seychelles – Africa
5. Canada

source: http://en.wikipedia.org/wiki/List_of_territorial_entities_where_Tamil_is_an_official_language