From Answers.com:
Settled by Achaeans, Aeolians, Ionians, Minoans, and Dorians by 1000 B.C., the region grew as an amalgam of independent city-states, many of which established colonies throughout the Mediterranean by the eighth century B.C..
So it was sometime before 1000 BC.
Crete
Depends on what region of Greece you are in. If you are in Athens, Thessaloniki, or some of the other more populated cities it becomes pretty dense. However rural Greece on the other hand is sparsely populated.
Skala is a little village on the island of Cephalonia in Greece. The population was last estimated to be only 530 although during the summer with the tourists it does become more populated.
I do believe it Athens. It is also the capital
Around 70,000 BC when Greece was first populated
New Jersey became populated in the years 1930-1990
Both the Indus and valleys of Greece were populated from early times by farmers and ranchers who had goats, sheep and cattle.
Some of the first populated countries were Mesopotamia and Egypt. Also India and the rest of Africa. Greece and Rome came shortly after the others.
He united it.
Greece is a country that has been populated by civilizations for at least 4500 years. You may need to be more specific about a timeframe or a place for something short of a wikipedia article.
Greece become an independent nation in the 1800's
Lots of babies were born