To calculate the population density of Phoenix, Arizona, you divide the population by the area. The population is 1,445,632 people, and the area is 450 square miles.
Using the formula for population density:
\[ \text{Population Density} = \frac{\text{Population}}{\text{Area}} = \frac{1,445,632}{450} \approx 3,211.4 \text{ people per square mile} \]
Therefore, the population density of Phoenix is approximately 3,211.4 people per square mile. This means that, on average, there are over 3,200 residents living within each square mile of the city's land area.