From the growing by leaps and bounds "SCHOOLS-TRENTON" folder in the Hamilton Local History Collection, the above news article from the Trenton Times.
Harrison School is one of Trenton's oldest. I believe the original school goes back to 1903 when the Chambersburg-South Trenton area began to develop. The interesting Trenton Times photo above shows workmen renovating the building. The photo borrowed from the Harrison School website shows that the old building is still keeping the educational flame alive in Trenton.