Fannettsburg is an unincorporated town in Metal Township, Franklin County, Pennsylvania, United States.
Somewhat confusingly, it is located about 6 miles south of Fannett Township, although it was named for the township and was once part of it.
Fannettsburg was platted in 1790, and named after Fannett Township. A post office called Fannettsburg was established in 1809, the name was changed to Fannettsburgh in 1827, and name restored to Fannettsburg in 1892.
Fannettsburg's ZIP code, 17221, covers , a population of 637 and 316 housing units, 252 of them occupied. Vacant housing unit stats is misleading, as it includes a former campground that has vacant mobile homes. There are currently (2021) only two vacant homes in the main part of town.
