Washington freed his in his will, but Jefferson did not. I’ve never visited Montpelier, so I don’t know if Madison did (I suspect so). The slave quarters are still present at Ash Lawn, so Monroe is a “yes.” I’ve never been to the Hermitage, but I suspect Jackson did. Harrison was born and raised at Berkeley, but I don’t know about later in life (Indiana Territory was free state, yes?). I’ve been to Sherwood Forest, but don’t recall if Tyler did or not (I suspect so). Taylor and Polk were the only other Southerners, and I’m not sure about them either.
What’s the Dope on Presidents and the “peculiar institution?”
I believe that US Grant did once, briefly own a slave. The slave was given to him by his father in law when Grant was down and out, obviously before the war. I think the slave had a skill, possibly he was a blacksmith. Grant freed him after about six months. I don’t remember if Grant used his slave’s income to offset the cost of his freedom, or simply manumitted him without compensation.