After 1869, the northern Japanese island was known as Hokkaido;[1] and regional administrative subdivisions were identified, including Oshima Province.[2]
August 15, 1869 Oshima Province established with seven districts
1872 Census reports 75,830 inhabitants of the province
July, 1881 Tsugaru District and Fukushima District merged to form Matsumae District, reducing the number of districts to six.