<Tr> <Th> FIPS code </Th> <Td> 04 - 23760 </Td> </Tr> <Tr> <Th> Website </Th> <Td> http://www.florenceaz.gov/ </Td> </Tr> <P> Florence (O'odham: S - auppag) is a town, 61 miles (98 km) southeast of Phoenix, in Pinal County of Arizona, United States . Florence, which is the county seat of Pinal County, is one of the oldest towns in that county and is regarded as a National Historic District with over 25 buildings listed on the National Register of Historic Places . The population of Florence was 30,770 at the 2015 census . </P> <P> The area where the current town of Florence is located was once inhabited by the members of the Athabascans, ancestors of the San Carlos Apache tribe . Prior to the establishment of the town, the Gila River served as a part of the border between the United States and Mexico . In 1853, the Gadsden Purchase extended American territory well south of the Gila . </P>

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