The population growth in Okinawa Prefecture is classified into three phases as a whole, i. e. a stagnation from 1920 to 1944, an upheaval due to the cease of World War II, and a diversification among regions after 1950. The diversification after 1950 is restatable as the rapid growth of urban populations and the stagnation or decrease of rural or small islands populations. The distance from the central part of population increase to each administrative regions has been related to the pattern of population growth in each regions, and as such centers, three areas; urbanized area in central and southern parts of Okinawa Island, Hirara City and its neighbour, and Ishigaki City, are denoted.