There are several canonical Orthodox Churches in Dallas:
1) St. Seraphim Orthodox Cathedral 4112 Throckmorton Dallas, Tx 75219 (Phone) 214-528-3741
a very nice traditional Church serving the Orthodox Church in America and the Cathedra Seat of Archbishop Dimitri a convert from protestantism
The Cathedral is noteable for the beauty of its icons and the reverence which the services (English and Church Slavonic)are served by the clergy of the cathedral.
2) Holy Trinity Greek Orthodox Church 13555 Hillcrest Road Dallas, Texas 75240-5412 (Phone) 972-991-1166
The oldest of all Orthodox Communities in Dallas dates back to 1915. The current Parish resulted from the combining of all Greek Orthodox
Community Chapels and missions in Dallas to create a Mega-Greek Orthodox Church for the City. It is the largest Orthodox Congregation in
Dallas. Its people are welcoming. Services are held in Greek and English.
3) Saints Constantine and Helen Antiochian Orthodox Church 3755 Walnut Hill Lane, Dallas Texas Phone: 214-350-2104
A Welcoming Church Community that is growing faster than its building program can keep up with. Founded in 1978, it is in the midst of a building fund raiser to get a new larger building. It has a great Sunday School program and Youth group. Services are in English with occassional Arabic and Greek used during "ektanias".
4) St Nicholas Russian Orthodox Church (ROCOR) 3617 Abrams, Dallas Texas, 75214-3009 (Phone) 972-529-2754
This Parish of the Russian Orthodox Church Outside of ZRussia is the newest Orthodox parish in Dallas and the only Old Calendar Church for the city. The church is somewhat difficult to locate as it is in a rented building located on the campus of All Saints Episcopal, in white building behind their main building, and totally separate from it. There is an entrance off the alley, and a sign on the door. The community is largely Convert and welcoming to visitors. Services are held in English primarily with some Church Slavonic.
Expanding out of Dallas to the immediate suburbs you will find smaller congregations:
5) Our Lady of Walsingham Antiochian Orthodox Church (Western Rite) 933 Cascade St. Mesquite TX 75149 (Phone) 972-216-2922
This small Western Rite Orthodox congregation is part of the Antiochian Orthodox Archdiocese. Services are in English.
6)Holy Three Hierarchs Serbian Orthodox Church 2324 Village Creek Dr Irving, TX 75060 (Phone) (214) 441-9267
A small mission of the Serbian Orthodox Church. Services are in English and Church Slavonic.
7) St. Sava Orthodox Church 3801 E Ave. K Plano, TX 75074 (Phone) 972-612-3881
A small mission of the OCA.I have not visited it but hear good things about it.
corrected for spelling and syntax