The Game of Thrones wikia lists the 7 kingdoms as (define at the time of Aegon's conquest):
- Kingdom of the North, ruled by House Stark of Winterfell
- Kingdom of the Mountain and the Vale, ruled by House Arryn of the Eyrie
- Kingdom of the Isles and Rivers, ruled by House Hoare of castle Harrenhal. Formed when the Iron Islands conquered the Riverlands.
- Kingdom of the Rock, ruled by House Lannister of Casterly Rock
- Kingdom of the Stormlands, ruled by House Durrandon of Storm's End
- Kingdom of the Reach, ruled by House Gardener of Highgarden
So in present day, Tullys rule the Riverlands (since Aegon put the beats on Harren Hoare
- Dorne, ruled by House Martell of Sunspear.
), the Tyrell's rule the Reach (again thanks to Aegon) and Baratheons rule the Stormlands though I'm not sure....who occupies Storm's End now?
#StannisSet still rules Storm's End currently in the show...no one ever really talks about it