There are over 300 million members of the Eastern Orthodox Church
About 350 million.
There are over 300 million Orthodox Christians worldwide, and most of them are in Russia, which has over 150 million alone.
Parish of the Mother's of God Protection c / Aragó, 181, 08011 Barcelona, Spain AND Paroquia Ortodoxa de San Andrés y San Nicolás Virgen del Socorro, 59, 03001 Alicante,...
Some statistics mention that there are about 225-300 million Christians in the Eastern Orthodox Church worldwide.