Porterville is a city in the San Joaquin Valley, in Tulare County, California, United States. It is part of the Visalia-Porterville metropolitan statistical area.Since its incorporation in 1902, the city's population has grown dramatically as it annexed nearby unincorporated areas. The city's July 2014 population (not including East Porterville) was estimated at 55,466.Porterville serves as a gateway to a vast wonderland and recreational area, the Sequoia National Forest, the Giant Sequoia National Monument and Kings Canyon National Park.HistoryDuring California's Spanish period, the San Joaquin Valley was considered a remote region of little value. Emigrants skirted the eastern foothills in the vicinity of Porterville as early as 1826. Swamps stretched out into the Valley floor lush with tall rushes or "tulares" as the Indians called them.Gold discovered in 1848 brought a tremendous migration to California, and prairie schooners rolled through Porterville between 1849 and 1852. Starting in 1854, Peter Goodhue operated a stopping place on the Stockton - Los Angeles Road on the bank of the Tule River. Wagon trains of gold seekers passed through the village, but other travelers found the land rich and remained to establish farms. A store was set up in 1856 to sell goods to miners and the Indians, who lived in tribal lands along the rivers. From 1858 to 1861 it was the location of the Tule River Station of the Butterfield Overland Mail.