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.
Ecumenical Patriarchate in America
Reliable statistics are difficult to find, but the Ecumenical Patriarchate has roughly 500,000 adherents (or up to 2 million, by some estimates) in the United States  worshiping at about 750 parishes (about 725) and monasteries (about 25). This includes 14 defined dioceses (a number of which overlap, since multiple jurisdictions exist), governed by 19 diocesan and auxiliary bishops. Thus Constantinople is by far the largest numerical representation of Eastern Orthodoxy in North America, including roughly twice as many Eastern Orthodox Christians under its omophorion than all other jurisdictions combined and about two-fifths of all Orthodox bishops in America. Of the nine bishops who are members of SCOBA, four represent Constantinopolitan jurisdictions.The Sacred Patriarchal and Stavropegial Orthodox Monastery of St. Irene Chrysovalantou in Astoria, New York, founded in 1972, had historically been part of the Old Calendarist movement (specifically the "Kiousis Synod") but in 1998 it came under the omophorion of the Ecumenical Patriarch. Though not formally organized as a diocese, the monastery and its ten metochia—two monasteries and eight parishes—essentially function as a jurisdiction of the Ecumenical Patriarchate in the United States (also including one mission in Belize).