These are all churches that currently hold Orthodox services. If I can't find evidence of a church that holds regular services (house churches count), then the country does not have an Orthodox Church listed. I have included Oriental Orthodox Churches. If you know of a country with an Orthodox Church that I have missed or overlooked, please let me know.
East Timor
I cannot find an Orthodox Church in East Timor, however there is a new one being built in West Timor, and the Indonesian Orthodox Church has missions in East Timor, so it looks promising.
Ecuador
It is very difficult to find any Orthodox Churches in Ecuador and it is made more confusing by the presence in Quito of a non-canonical group using the name Orthodox. I have found efforts by the Russian Church to build in Ecuador as well as two churches under the Ecumenical Patriarch: http://orthodox-world.org/world_index.php?country=Ecuador
Please Pray for the Orthodox Church in Ecuador!
Egypt
St Takla Haymanout Coptic Orthodox Church, Alexandria
El Salvador
It looks like there are currently no Orthodox Churches in El Salvador, though there are people who have expressed a wish to join the Orthodox Church.
Please pray for the Christians in El Salvador!
Equatorial Guinea
Equatorial Guinea is primarily Roman Catholic. I cannot find evidence of any Orthodox Churches there. Please Pray for an Orthodox Church in Equatorial Guinea!
Eritrea
St Mary's Orthodox Church, Asmara
Estonia
Church of Puhtitsa, Puhtitsa
Ethiopia
Our Lady Mary of Zion
(Supposedly has the Ark of the Covenant...)
(Supposedly has the Ark of the Covenant...)