ARIZONA POPULATION—ARIZONA NUMBER AND DISTRIBUTION OF INHABITANTS Population of the State.—Arizona was organized as a Territory in 1S63 and was admitted to the Union as the forty-eighth Slate in February, 1912. Its population on April 1, 1930, according to the Fifteenth Census, was 435,573, which represents an increase of 101,411, or 30.3 per cent, as compared with its population on January 1, 1920. The total land area of the State, as shown in Fable 3, is 113,S10 square miles. The average number of inhabitants per square mile in 1930 was 3.S, as compared with 2.9 in 1920. Table 1 shows the population of Arizona from 1870, the year in which its area was first separately enumerated, to 1930, together with the increase during each decade. Table 1.—Population of Arizona: 1S70 to 1930 INCREASE OVER PRECEDING CENSUS •135, 573 o.u, i<;l> 2