Porterville (also Maryville) is a census-designated place and unincorporated community in Kemper County, Mississippi. As of the 2020 census, Porterville had a population of 34. It lies a slight distance away from U.S. Route 45 southeast of the city of De Kalb, the county seat of Kemper County. Its elevation is 200 feet (61 m). It has a post office with the ZIP code 39352. It is adjacent to Lake Porterville.
Porterville was named for the first postmaster, Willie N. Porter. The community is located on the CPKC Railroad ex Kansas City Southern Railway and the post office first opened on May 24, 1890. Porterville was once home to several stores and in 1906 had a population of 200.
The Porterville General Store is listed on the National Register of Historical Places.