Woodrow Wilson is currently the only president buried in the National Cathedral.
Well Woodrow Wilson is not actually buried in the Cathedral but instead he's entombed in an above ground tomb that you can walk by when you visit the National Cathedral.
Other notable people are entombed or buried in the National Cathedral as well including Helen Keller, Admiral George Dewey, Bishop Satterlee and the architects Henry Vaughan and Philip Frohman.
They are really entombed and not actually buried though but you can go walk through the National Cathedral and visit those tombs.
It's a beautiful place to visit as well.