That's a good question. Does anyone know? I'm assuming that we're not speaking of one that merely tolerates members who believe in only 4 but makes this its official stance.
As to denominations, I believe the Presbyterian Church from 1903 has taught 4 points.
In 1903 the following was added to Westminster:
First, with reference to Chapter 3 of the Confession of Faith: that concerning those who are saved in Christ, the doctrine of God's eternal decree is held in harmony with the doctrine of his love to all mankind, his gift of his Son to be the propitiation for the sins of the whole world, and his readiness to bestow his saving grace on all who seek it; that concerning those who perish, the doctrine of God's eternal decree is held in harmony with the doctrine that God desires not the death of any sinner, but has provided in Christ a salvation sufficient for all, adapted to all, and freely offered in the gospel to all; that men are fully responsible for their treatment of God's gracious offer; that his decree hinders no man from accepting that offer; and that no man is condemned except on the ground of his sin.
While this is somewhat ambiguous, I think this pushes in the direction of sufficient for all but efficient only for the elect, which is the 4-point understanding.
Of course the PCUSA at this point permits a variety of views. The Confession of 1967 says:
The risen Christ is the savior for all men. Those joined to him by faith are set right with God and commissioned to serve as his reconciling community. Christ is head of this community, the church, which began with the apostles and continues through all generations.
This seems to reject limited atonement unambiguously. It makes no statement about whether the gift of faith is from election or not. However some level of election is implied by the Brief Statement:
Yet God acts with justice and mercy to redeem creation.
In everlasting love,
the God of Abraham and Sarah chose a covenant people
to bless all families of the earth.
Hearing their cry,
God delivered the children of israel
from the house of bondage.
Loving us still,
God makes us heirs with Christ of the covenant.
Like a mother who will not forsake her nursing child,
like a father who runs to welcome the prodigal home,
God is faithful still.
The catechism says:
That God does not will to be God without us, but instead grants to us creatures fallen and mortal as we are eternal life. Communion with Jesus Christ is eternal life itself. In him we were chosen before the foundation of the world. By him the eternal covenant with Israel was taken up, embodied, and fulfilled. To him we are joined by the Holy Spirit through faith, and adopted as children, the sons and daughters of God. Through him we are raised from death to new life. For him we shall live to all eternity.
However the phrase chosen in Christ can imply the Barthian or even Arminian view of election. I think it is fair to say that the PCUSA currently teaches election, but permits several different views of how it works.