Seffner is a census-designated place (CDP) in Hillsborough County, Florida, United States. The population at the 2020 census was 8,362, up from 7,579 at the 2010 census.
Post office
State Road 574 is an east–west state highway in Central Hillsborough County, Florida. It runs from northwestern Tampa to Plant City, and parallels County Road 574 west of Mango.
Eastbound SR 574 as it crosses the Hillsborough River over the Paul H. Smith Bridge.