A shekara ta 1789, an rage girman Montgomery County ta hanyar raba shi daga gundumar Ontario.
Tabbas, wani nau'i mai rikitarwa na jumla shine "A shekara ta 1789, an rage girman Montgomery County ta hanyar raba shi da gundumar Ontario; a shekara ta 1791, an rage Montgomery County ta hanyar raba shi da Herkimer, Otsego, da kuma Tioga Counties. "