Maricopa County was formed in 1871 from Pima, Yavapai, and Yuma Counties.

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1880 Maricopa County, Arizona Census

1890 Maricopa County, Arizona Census

1900 Maricopa County, Arizona Census

1910 Maricopa County, Arizona Census

1920 Maricopa County, Arizona Census

1930 Maricopa County, Arizona Census