Note Revelation 1:4, 11
It should be noted that these churches are mention in clockwise order according to location. The deliverer of this letter presented it in the following order:
Ephesus in the coast
Northward to Smyrna and Pergamum
East to Thyatira
Southeast to Sardis, Philadelphia, and Laodicea
These churches are located in Asia, which is now called Turkey.
Later scripture reveals the information to each church.