Porterville (also Maryville) is an unincorporated community in Kemper County, Mississippi, United States. 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), and it is located at 32°41′16″N 88°28′20″W﻿ / ﻿32.68778°N 88.47222°W﻿ / 32.68778; -88.47222 (32.6879121, -88.4722596). Although it is unincorporated, it has a post office, with the ZIP code of 39352. It is adjacent to Lake Porterville.