Summithill is an unincorporated community in Ross County, in the U.S. state of Ohio. [1]
Summithill had its start in the 1870s when the railroad was extended to that point, and so named on account of its lofty elevation. [2] Variant names were "Summit" and "Summit Hill". [1] A post office called Summit Hill was established in 1878, the name was changed to Summithill in 1895, and the post office closed in 1946. [3]