The seven churches of Asia Minor, as in the Revelation recorded by the John of Patmos, are located in

Ephesus (Metropolis of Ephesus)
Smyrna (Metropolis of Smyrna)
Pergamon (Metropolis of Pergamon)
Thyatira
Sardis (See of Sardis)
Philadelphia (Metropolis of Philadelphia)
and Laodicea (see Laodicean Church)