Zion — That is, Zion itself, or Jerusalem, which was built upon and near mount Zion. He saith Zion rather than Jerusalem, to intimate that he loved Jerusalem for Zion's sake, or for the temple, which he chose for his peculiar dwelling place.
Related Commentaries of Psalms 87:2
Psalms 87:2
2 The LORD loveth the gates of Zion more than all the dwellings of Jacob.