Paul, an apostle of Jesus Christ through the will of God, to the holy ones who are in Ephesus, and to the faithful in Christ Jesus:
Ephesians 1:1 LSV

Strangely, the oldest manuscript of Ephesians doesn't say "who are in Ephesus" in the salutation. Whether that's a problem with that manuscript or a problem with later manuscripts is an interesting question, but doesn't change the meaning of the Epistle.