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is a city in Tulare County, California, United States. The population was 39,615 at the 2000 census. City limit signs currently have the population at 51,467. The city's population grew dramatically as the city annexed many properties and unincorporated areas in and around Porterville. Porterville is considered part of the Census Bureau's designation of the Visalia-Porterville metropolitan statistical area.
According to the United States Census Bureau, the city has a total area of 14.1 square miles (36.4 km²), of which, 14.0 square miles (36.3 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.50%) is water.
Porterville is located in the foothills of the Sierra Nevada mountains, and many of the town's inhabitants are intimately familiar with the upper regions of the hills. There is also a large man-made body of water, Lake Success, which finds much use for recreation and revelry when in season.