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The boundaries of most counties in Arizona do not follow the northern boundary of the Gadsden Purchase, but six counties in Arizona do have most of their populations within the land of the Gadsden Purchase. Four of these also contain areas north of the Gadsden Purchase, but these areas have low population densities, with the exception of northeastern Pinal County, Arizona, including the towns of Apache Junction and Florence. Maricopa County also extends south into the area of the Gadsden Purchase, but this area is also thinly populated. Tucson is the largest city in the Gadsden Purchase.