Pocatello () is the county seat of and largest city in Bannock County, with a small portion on the Fort Hall Indian Reservation in neighboring Power County, in the southeastern part of the U.S. state of Idaho. It is the principal city of the Pocatello metropolitan area, which encompasses all of Bannock County. As of the 2020 census the population of Pocatello was 56,320. Pocatello is the fifth-largest city in the state, just behind Idaho Falls. In 2007, Pocatello was ranked twentieth on Forbes list of Best Small Places for Business and Careers. Pocatello is the home of Idaho State University and the manufacturing facility of ON Semiconductor. The city is at an elevation of above sea level and is served by the Pocatello Regional Airport. History Indigenous tribes Shoshone and Bannock Indigenous tribes inhabited southeastern Idaho for hundreds of years before the trek by Lewis and Clark across Idaho in 1805. Their reports of the many riches of the region attracted fur trappers and traders to southeastern Idaho. The city is named after Chief Pocatello, a 19th-century Shoshone leader. Permanent settlements Nathaniel Wyeth of Massachusetts established one of the first permanent settlements at Fort Hall in 1834, which is only a few miles northeast of Pocatello. When over-trapping and a shift in fashion to silk hats put an end to the fur trade, Fort Hall became a supply point for immigrants traveling the Oregon Trail. Although thousands of immigrants passed through Idaho, it was not until the discovery of gold in 1860 that Idaho attracted settlers in large numbers. The gold rush brought a need for goods and services to many towns, and the Portneuf Valley, home of Pocatello, was the corridor initially used by stage and freight lines. The coming of the railroad provided further development of Idaho's mineral resources and "Pocatello junction" became an important transportation crossroads as the Union Pacific Railroad expanded its service. Gateway to the Northwest After its founding in 1889, Pocatello became known as the "Gateway to the Northwest". As pioneers, gold miners and settlers traveled the Oregon Trail, they passed through the Portneuf Gap south of town. Stage and freight lines and the railroad soon followed, turning the community into a trade center and transportation junction. Gold rush and agriculture After the gold rush played out, the settlers who remained turned to agriculture. With the help of irrigation from the nearby Snake