We investigated the distribution of Osaka public housing, with regard to location and number of rooms. The results are as follows. 1. During the postwar reconstruction, Osaka city built about 800 low-level public housing units in the war-damaged area of Uemachi Plateau, situated to the south of Osaka city. At the start of economic growth, Osaka city built.about 10, 000 more mid-level housing units, which were scattered throughout the city. The main locations were on the Osaka Gulf bank, the Yodo River bank, Uemachi Plateau, and Abeno Plateau. These areas were war-damaged sites, munitions factory sites and former parade grounds. During the latter half of the rapid economic development period, Osaka city built about 14, 000 high-density high-rise units. These unit extend like a belt along the Osaka Gulf bank, the Yodo River bank, and the redeveloped areas on the Higashi Osaka Plain. They are also being located in former munitions factories and former parade grounds within Osaka city. During the period of more stable economic growth, Osaka city built about 5, 000 condominium and high-class housing units on former redevelopment areas, former munitions factory sites, former warehouse sites, farmland to the north and west of the town area, the Osaka Gulf bank and the Yodo River bank. 2. Three-quarters (76%) of Osaka's public housing units are two-, three-, or four-room apartments. Situated in industrial areas, on reclaimed land, and in mixed-zoned residential/industrial areas, Konohana ward, Taisho ward and Suminoe ward contain many two-room housing units. Jyoto ward, a former military parade ground, contains many three-room apartments, but these larger units can also be found in other areas. Miyakojima ward, on the left side of the Yodo River, and Oyodo ward are areas of mixed zoning, i. e., for residential, industrial and public land use. Therefore the factors involved in the distribution of the number of rooms per unit are probably land price, the convenience of services and amenities, and the affordable standard of living. 3. The amount of public housing in Osaka has increased, and at the same time room construction has increased and incidental institutions have proliferated. However, the social environment surrounding the area of public housing has not developed into a desirable living environment. Poor siting locations have been a factor for example, soft and damp soil conditions instead of hard and dry. In the future good environments should be chosen for the construction of public housing units, so that they become valuable city assets, and desirable areas of social investment.