 Creation of Bingham County in 1885 left Oneida County with only 2,633 mi2, while creation of Franklin and Power Counties further reduced the county's area to 1,219 mi2 in 1913.Minor changes to boundaries occurred in 1917 and 1927 that gave Oneida County its present land area.Early loss of territory had no impact on population growth of the county as some areas lost had almost no population or were offset by heavy migration of Mormons occurring along Idaho's southern border.