 The first division of the county occurred in 1814 when the northern portion of the county was separated to become Washington County . The county was again divided in 1818 with the western part of the county being separated to become Crawford County . A third division occurred in 1819 when Floyd County was created out of the eastern part of the county . Harrison County 's eastern border has had minor adjustments through land transactions with Floyd County ; the last change occurred in 1968 . 
