Both Mount Zion and Jerusalem are symbolic
of heavenly entities.

Also both the earthly Zion is spoken of in Scripture, and also the heavenly Zion. For instance you can see this in Psalm 11. In Psalm 11 David is being told that he had better run for his life, because the wicked are getting ready to shoot him in the dark, Psa 11:1-2. David then asks very mournfully, if the foundations are destroyed, what can the righteous do, Psa 11:3? Indeed, David has already said that Yahweh lives on Mount Zion.

“Sing praises to Yahweh, who dwells in Zion,
And declare among the people what he has done.”
Psa 9:11 WEB

But there is more to the story.

Despite this, David by inspiration also says in Psa 11:4, “Yahweh is in his holy temple.” There is more to point out even here. In English, and in many languages, there is a word for a temple, and word for a palace, and these are different concepts. In Hebrew however the word hekal does double duty as the word for both a king’s palace and a religious temple. In this sense then, the temple of God is really God’s palace to the Hebrew mind. The other term used in Hebrew is to call it “the house of God,” which is the ordinary term for in Hebrew for a “house,” byet, which even further enforces the idea that God lives there, and David did say Yahweh lives/dwells in Zion, Psa 9:11 above.

Solomon of course denies the literalness of God
living on earthly Mount Zion,

“But will God in very deed dwell on the earth? behold, heaven and the heaven of heavens can’t contain you; how much less this house that I have built!”
1Kgs 8:27 WEB

But David says more that once more.

“Out of Zion, the perfection of beauty,
God shines forth. ”
Psa 50:2 WEB

Or again, and of course Jerusalem is Jeru-salem, David speaks of the original tent of meeting.

“His tent is also in Salem;
His dwelling place in Zion.”
Psa 76:2 WEB

And God’s rule goes forth out of Zion (a double meaning do you think?)

“Yahweh will send forth the rod of your strength out of Zion. Rule in the midst of your enemies.”
Psa 11:2 WEB

Or another time, but perhaps more mysteriously

“Yahweh is great in Zion.
He is high above all the peoples.”
Psa 99:2 WEB

All the same, David gives details in Psalm 11.

Yes, Yahweh is in His holy temple, Psa 11:4a, and then he tells us,

“Yahweh is on his throne in heaven,” Psa 11:4b

The palace of God, the real palace, is in heaven.

God’s rule is not threatened by the rule or
opposition of someone on earth.

“5 Yahweh examines the righteous,
But the wicked and him who loves violence his soul hates. Psa. 11:6 On the wicked he will rain blazing coals; Fire, sulfur, and scorching wind shall be the portion of their cup. ”
Psa 11:5-6 WEB

Earthly Zion is only symbolic, a type, of the true palace of God and His throne.

WEB is the World English Bible, a copyright free revision
of the original ASV American Standard Version 1901