Fast Facts
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Seffner is an unincorporated census-designated place in Hillsborough County, Florida, United States. The population was 5,467 at the 2000 census, although its ZIP codes (33584 & 33583), which boundaries extend beyond the ones given by the census and include the places of Mango and a portion of Thonotosassa, have a population of around 35,000.
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