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GOOGLE translation :
The population of Rancho Cucamonga, California is 151,640 people. The area of Rancho Cucamonga is 37.4 mi ^ 2.
Find population density - the number of people per square mile.
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It is = 4054.545 persons per square mile,
or, rounded to the nearest integer number, 4055 persons per square mile.
Very straightforward calculation.
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