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<br />. <br /> <br />. <br /> <br />w <br />00 <br />OJ <br />C> <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />.0 <br /> <br />OBERS Regions (See Figure III- 9 ) is shown in Table llI-4. The cities <br /> <br />having populations in 1970 greater than 5,000 are listed in the Table, along <br /> <br />with the 1970 population. Seventy-two percent of the cities in the Upper <br /> <br />Colorado Region have populations of les.s than 500, and only nine _ percent <br /> <br />of the cities had populations greater than 2,000. Less than thr.ee percent <br /> <br />had populations greater than 5,000. Farmington, New Mexico is the largest <br /> <br />city in the Upper Colorado Region with a 1970 population of 2l, 979. <br /> <br />The Lower Region is also sparsely populated, having an average density <br /> <br />of about l4 persons per square mile. This is a density of almost five times <br /> <br />greater than that found in the Upper Colorado Region. In 1970 there were <br /> <br />33 cities in the Lower Region with populations greater than 5,000. Ten of <br /> <br />the 33 cities had populations greater than 20,000 and six cities had populations <br /> <br />that exceeded 50,000. A summary of the number of towns by the ranges <br /> <br />of population size in each of the six OBERS Regions (See Figure III-LO ) <br /> <br />is shown in Table III- 4. <br /> <br />The cities having 1970 populations greater that <br /> <br />5,000 are also shown in the Table, along with the populations. Sixty-eight <br /> <br />percent of the cities in the Lower Colorado Region have populations of <br /> <br />les s than 500, and only six percent of the cities had populations greater <br /> <br />than 2,000. Approximately six percent of the cities had populations greater <br /> <br />than 5,000 and less than 1. 5 percent had populations greater than 50,000. <br /> <br />Three metropolitan areas had populations in excess of lOO, 000. These were <br /> <br />Phoenix, Arizona; Tucson, Arizona; and Las Vegas, Nevada. Phoenix is <br /> <br />the largest city in the Colorado System with a population of 582,500 in 1970. <br /> <br />41 <br />