Which preposition to use with hillsdale

on Occurrences 2%

Breakfast being over, he announced his intention of going down to Boston, telling Maggie he should probably return that evening and go with her to Hillsdale on the morrow.

at Occurrences 1%

She at least has deceived me;" and with a feeling of keen disappointment he continued to pace the floor, one moment resolving to leave Hillsdale at once, and again thinking how impossible it was to tear himself away.

in Occurrences 1%

Oakwood is just wild to get ahead of Hillsdale in something.

Which preposition to use with  hillsdale