Eastern Orthodoxy by country
Based on the numbers of adherents, the Eastern Orthodox Church (also known as Eastern Orthodoxy) is the second largest Christian communion in the world after the Roman Catholic Church. The most common estimates of the number of Eastern Orthodox Christians worldwide is approximately 200–260 million. The numerous Protestant groups in the world, if taken all together, outnumber the Eastern Orthodox, but they differ theologically and do not form a single communion.
Antiochian Greek Christians
But with some Incomplete data about the Near East and Australia. In the Latin America living 2.500.000 Greek Orthodox Melkites, in North America in U.S.A and Canada the membership of Antioch Church is about 500.000 people. In Australia and New Zealand the Greek Orthodox Melkites counts about 43.500 or according the Prime Minister's estimate in 2007 - 123.000 members . In rest of Asia exist about 80.000 Antiochean Greeks mostly in Turkey. In Europe exists about 40.000.https://www.oikoumene.org/en/member-churches/greek-orthodox-patriarchate-of-antioch-and-all-the-east 
In the Near East the Lebanon has an important population, according Statistics Lebanon Beirut-based research firm, the Greek Orthodox in country is the 8% of total population of Lebanon (6.184.701 ), about 500.000 people https://www.state.gov/j/drl/rls/irf/2012/nea/208400.htm,  https://www.cia.gov/library/publications/the-world-factbook/geos/le.html#People. In Syria the Greek Orthodox Melkites is the 45.7% of christians in country, the biggest group among Christians https://web.archive.org/web/20100302140119/http://www.fw-magazine.com/content/patriarch-antioch-i-will-be-judged-if-i-do-not-carry-church-and-each-one-you-my-heart. The Greek Orthodox population of Syia is about 1.142.500 people. The total population is about 4.600.000 - 4.760.000 around the world.https://www.oikoumene.org/en/member-churches/greek-orthodox-patriarchate-of-antioch-and-all-the-east