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Maricopa County, AZ, exhibits a robust population growth rate of 1.5% over the past year, outpacing the state average of 1.3%. With a median age of 37.1, it is slightly younger than the state median of 38.4. The county's age dependency ratio of 63.1 indicates a balanced demographic, with a lower old-age dependency ratio (25.4) compared to the state (30.3), suggesting a healthier working-age population. Notably, Maricopa has a higher percentage of residents under 18 (23.1%) than the state average (22.2%), reflecting its appeal to families compared to other counties like Pima and Yavapai.