Harper rests inside northwestern Oklahoma which has held since prior to statehood - 16th November 1907 - when Buffalo proudly became founded as its county seat while many other towns like Blaine, Sharon and Woodward stretch across its 5 200 km² (2002 sq mi). A recent number taken by the UUnited States States Census Bureau estimates counted 3 677 people were reported to live within Harper come 2019 which classifies Harper undeniably amongst those counties existing amongstOklahoma's least populous areas .